JP2015171356A - Method of suppressing pest insect on plant body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress colonization and egg-laying of pest insects on a plant body at a low cost.SOLUTION: A red light source emitting a red light (a light with a wavelength of 600-700 nm) is installed in a greenhouse and is made to emit the red light toward a plant body planted in the greenhouse, in addition to sunlight or light from a fluorescent lamp. Light intensity of the red light on an irradiation surface of the red light on the plant body is equal to or more than 1×10photons/msec. Irradiation of the red light suppresses colonization and egg-laying of pest insects, especially pest insects belonging to Thysanoptera including Thrips palmi Karny, Frankliniella occidentalis Pergande, Frankliniella intonsa and Thrips tabaci Lindeman.

Description

  The present invention relates to a pest control method for a plant that suppresses the establishment of the pest on the plant and spawning.

  In recent years, in the institutional cultivation of vegetables, year-round cultivation is performed by heating in winter. For this reason, micro pests occur throughout the year, and drugs are mainly used to control them. However, in the closed space of the facility, the same strain of drug is sprayed several times throughout the year, so that the pesticide's drug susceptibility decreases, and the newly registered drug also decreases its control effect after several years. On the other hand, since it takes several years to develop a new drug, it is necessary to establish a new control method that does not depend only on drug control.

  Under such circumstances, methods for controlling pests have been developed that suppress the establishment of the pests on the plants and the egg laying by irradiation of the plants with light. For example, in Patent Document 1 below, pseudo-sunlight that does not include a wavelength component of 500 to 600 nm is irradiated to the entire field, and attraction light having a peak in the wavelength range of 280 to 700 nm is irradiated to a part of the field. In addition, a pest control method for capturing diurnal pests gathered in a light source of attracting light to suppress the establishment of the pests in a plant body and spawning is shown. Patent Document 2 below is a natural enemy pest of spider mites by irradiating a plant with attracting light containing a wavelength component longer than blue light (specifically, attracting light containing a wavelength component of 470 to 960 nm). A spider mite control method is shown in which spider mites are exterminated by attracting spider mites.

  Moreover, although it is not extermination of a pest, the following patent document 3 suppresses the growth of filamentous fungi such as white mold disease and powdery mildew by irradiating a plant body with ultraviolet rays containing a wavelength component of 280 to 340 nm. It has been shown. Furthermore, the following Patent Document 4 shows that the growth of the same type of filamentous fungus as described above is suppressed by irradiating the plant with ultraviolet rays containing a wavelength component of 280 to 340 nm and a wavelength component of 100 to 280 nm. Has been.

JP 2011-67196 A JP 2011-72200 A JP 2005-328734 A JP 2009-22175 A

  However, in attracting pests using attracting light and capturing the attracted pests according to Patent Document 1, the pests other than the pests in the vicinity of the plant body to control the pests, that is, a little away from the plant body. There is a possibility that pests inhabiting at different positions also gather in the plant body and have an adverse effect on pest control. In addition, in the spider mite control method for controlling spider mites using the attracting light according to Patent Document 2, depending on the environment of the target plant body, the spider mite is a natural enemy pest, and the target plant body is a pest. Other pests may gather on the target plant.

  Moreover, the irradiation of ultraviolet rays according to the above-mentioned Patent Documents 3 and 4 is a method for controlling plant diseases to protect the plant bodies from filamentous fungi such as white mold disease, powdery mildew, and the like. If the plant body is irradiated, it can be used for repelling pests from the plant body. However, the price of the light source device that emits ultraviolet rays is very high, and there is a problem that the plant body cannot be controlled from pests at low cost.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a method for controlling pests that suppresses the establishment of the pests on the plant body and spawning at low cost. In addition, in the description of each constituent element of the present invention below, in order to facilitate understanding of the present invention, reference numerals of corresponding portions of the embodiment are described in parentheses, but each constituent element of the present invention is The present invention should not be construed as being limited to the configurations of the corresponding portions indicated by the reference numerals of the embodiments.

  In order to achieve the above object, the present invention is characterized by irradiating the target plant body (20A, 20B) with red light from the red light source (12) to suppress the establishment of insect pests and egg laying on the target plant body. There is a method for controlling insect pests.

In this case, the light intensity of the red light on the red light irradiation surface of the target plant body is, for example, 1 × 10 ¹⁸ photons / m ² · sec or more. In addition, for example, the pests are pests belonging to thrips including Thrips thrips, Thrips thrips, Thrips thrips and Thrips thrips. The target plant is, for example, melon (20A, 20B), eggplant, or cucumber grown in the greenhouse (10). Furthermore, red light is irradiated to a target plant body with the light by sunlight or a fluorescent lamp, for example.

  The present invention is based on the discovery of the present inventor that a pest parasitic on a plant body repels red light. As can be understood from the test results described later, the target plant body is irradiated with red light. Insect pests and spawning are suppressed in the plant body. Therefore, according to this invention, a pest is removed from a target plant body and the damage by the pest of a target plant body can be suppressed. In addition, even when a drug is sprayed on a target plant for removing pests, the number of times of spraying the drug can be reduced, a decrease in drug sensitivity of the pests can be suppressed, and the service life of the drug can be extended. Furthermore, the present invention can be realized at a lower cost than in the case where the target plant is irradiated with ultraviolet rays.

  Another feature of the present invention resides in that a light reflecting sheet is laid in a place where the target plant is planted in addition to the irradiation with red light. According to this, as can be understood from the test results described later, the establishment of the pests on the target plant body and the egg-laying are further suppressed.

It is a schematic perspective view of the greenhouse which employ | adopted the pest control method of the plant body which concerns on one Embodiment of this invention. It is a graph for demonstrating the emission band of the red light used by this invention, the emission band of the blue light used for the test, and white light. It is the schematic of the test apparatus used for the 1st test. It is the schematic of the test apparatus used for the 8th test. It is a graph which shows the change of the environmental temperature under the fluorescent lamp irradiation conditions in the 8th test. It is a graph which shows the change of the environmental temperature on the fluorescent lamp non-irradiation conditions in the 8th test. It is the schematic of the test apparatus used for the 9th test. It is a graph which shows the change of the total number of the southern larva thrips larvae and adults in the 9th test. It is the schematic of the test place in a 10th test. (A) is a graph showing changes in the number of thrips adults in the tenth test, and (B) is a graph showing changes in the number of thrips larvae in the tenth test. (A) is a graph showing changes in the number of adult southern thrips in the tenth test, and (B) is a graph showing changes in the number of southern thrips larvae in the tenth test.

a. Embodiments Hereinafter, a pest control method for a plant body according to an embodiment of the present invention will be described. FIG. 1 is a schematic perspective view of a greenhouse 10 employing the plant pest control method. In FIG. 1, melon seed 20A in seedling state is seeded in cultivated soil 11 on the left side and melon strain 20A in seedling state is grown at high density, and melon strain 20A in seedling state on cultivated soil 11 is shown on the right side. It shows the state where the melon strain 20B after planting is planted and grown at a certain large interval. In addition, melon stock 20A in a seedling state refers to a state up to a height of about 20 to 30 cm, and melon strain 20B after planting refers to a state of growing larger than 20 to 30 cm. In addition, when the melon stock 20B after planting grows to a height of about 2 m, the upper part is cut.

  In the greenhouse 10, red light sources 12 are arranged at a plurality of locations. As the red light source, in this embodiment, an LED light source that emits red light having a wavelength band of 600 to 700 nm, “trade name DELED Plants manufactured by Nabeyo Co., Ltd.” is used. Specifically, the red light from this LED light source has two emission level peaks at about 630 nm and 660 nm as shown by the solid line in the emission band graph of FIG. 2, and has a wavelength band of 600 to 700 nm. It has red light. The red light source 12 is not limited to the LED light source as long as it emits red light having a wavelength band of 600 to 700 nm, and various light sources can be used.

These red light sources 12 are provided so as to be suspended from the upper part of the greenhouse 10, and their heights can be changed. The red light source 12 is positioned at a low position for the melon stock 20A in a seedling state, and the red light source 12 is positioned at a high position for the melon strain 20B after planting. Thereby, the melon strain 20A in a seedling state and the melon strain 20B after planting can be irradiated with red light having a large intensity from above. In the present embodiment, when the red light from the red light source 12 is irradiated onto the melon strains 20A and 20B (that is, the leaves of the melon strain), the red light on the red light irradiation surface (the surface of the leaves of the melon strain). The intensity of the red light is set so that the light intensity of the light becomes 1 × 10 ¹⁸ photons / m ² · sec or more.

In addition, when red light is irradiated on the melon strain 20B after planting, the melon strain 20B grows when irradiated with red light only from above the melon strain 20B as described above. The leaves are not irradiated with red light of appropriate intensity. Therefore, in this case, the red light source 12 is moved upward in accordance with the growth of the melon strain 20B, and red light of appropriate intensity from the red light source 12 is irradiated to the entire leaves of the melon strain 20B. Like that. In addition, the red light is emitted from the lateral direction of the melon stock 20B, or a plurality of red light sources 12 are provided in the vertical direction, and the red light from the multiple red light sources 12 is applied to one melon stock. And so on. Further, a light reflecting sheet is laid on the soil in which the melon strain 20B is planted, and the melon strain 20B is irradiated with red light reflected by the light reflecting sheet. By irradiating the melon strain 20B with red light, the leaves of the melon strain 20B are also irradiated with red light having a light intensity on the leaf surface of 1 × 10 ¹⁸ photons / m ² · sec or more. It has become.

  In the greenhouse 10, a plurality of fluorescent lamps 13 that emit white light (light having a wavelength band of 400 to 800 nm) are also provided near the ceiling in the greenhouse 10. The plurality of fluorescent lamps 13 are lit for a time period in which sunlight is not irradiated, particularly for a predetermined time after sunset and a predetermined time before sunrise, and compensates for the irradiation of sunlight in winter or the like where the sunshine time is short. The fluorescent lamp 13 may be turned on at night. A heating device 14 is also provided in the greenhouse 10 in order to increase the temperature in the greenhouse 10 in winter when the temperature is low. Further, in the greenhouse 10, a water supply device (not shown) provided with a pipe or the like for supplying water to the melon stocks 20A and 20B is provided near the soil where the melon stocks 20A and 20B are planted.

  In the greenhouse 10 configured as described above, a time zone in which sunlight is irradiated on the melon stocks 20A and 20B (that is, daytime) and a time zone in which white light from the fluorescent lamp 13 is irradiated on the melon stocks 20A and 20B ( For example, the red light source 12 is turned on at a predetermined time after sunset and a predetermined time before sunrise. Thereby, in addition to the sunlight and the light from the fluorescent lamp 13 being applied to the melon stocks 20A and 20B, the red light from the red light source 12 is also applied to the melon stocks 20A and 20B. The reason for irradiating the melon strains 20A and 20B with red light from the red light source 12 during the daytime and before and after that is that, as regards the melon strain, the minute pests of thrips that are diurnal pests (the southern thrips) This is because the damage caused by

  In such irradiation with red light, as described above, when irradiating red light to the melon strain 20A in a seedling state, the red light source 12 is fixed at an upper position of the melon strain 20A, and red light is emitted. Is irradiated to melon strain 20A. However, when irradiating red light to the melon strain 20B after planting, the position and number of the red light sources 12 are changed according to the growth of the melon strain 20B, and the red light is irradiated to the melon strain 20B. .

  As will be described in detail using the test results described later, the thrips pests (the southern thrips) repel red light. Therefore, in this way, egg laying on the melon strain 20A in the pest seedling state (see X1 in the figure), jumping into the melon strain 20A in the pest seedling state (see X2 in the figure), and the melon strain after the planting of the pests Jumping into and setting on 20B (see X3 in the figure), jumping into the greenhouse 10 from outside the pest (see X4 in the figure), and the like are suppressed. In other words, the insect pests are removed from the target plant body by suppressing the colonization and spawning of the insect pests on the target plant bodies that are the melon strains 20A and 20B.

  As a result, by removing the pests by irradiation with red light as described above, damage to the target plant by the pests can be suppressed. In addition, by removing the pests, even when the drug is sprayed on the target plant body, the number of times the drug is sprayed can be reduced, a decrease in the drug sensitivity of the pests can be suppressed, and the service life of the drug can be extended. Moreover, compared with the case where an object plant body is irradiated with ultraviolet rays, the cost of the method of the above embodiment can be reduced.

  In order to remove pests on the melon strain 20A in the seedling state as described above and the melon strain 20B after planting, even if the melon strains 20A and 20B are irradiated with red light, the growth of melon, especially the melon fruit There was no impact on the harvest.

b. Test Next, the first to tenth tests conducted by the present inventor regarding the removal of pests (micro pests such as thrips) on the melon strain 20A in a seedling state and the melon strain 20B after planting will be described.

b1. 1st test The 1st test about the repelling with respect to red light of micro pests (Thysanoptera thrips), such as thrips, was done. As a test device, a 25cm x 25cm x 1.2m frame is made with a pipe made of vinyl chloride, and the upper and side surfaces are covered with an agricultural polyvinyl chloride sheet that transmits ultraviolet light, and a light reflecting sheet 31 is laid on the bottom surface. It was adopted. Then, as shown in FIG. 3, on the upper surface of the light reflecting sheet 31, a petri dish is placed at a position 50 cm on both sides from the center position (X position in the drawing) in the extending direction, and the filter paper is moistened on the upper surface of each petri dish. A leaf of green beans 32a and 32b cut according to the size of the petri dish is placed on each filter paper, and the entire surface of the light reflecting sheet 31 has an illuminance of 1000 in a room kept at 25 ° C. It was irradiated with light from a lux fluorescent lamp (white light). The illuminance of 1000 lux of the fluorescent lamp is as bright as general indoor lighting. Under this condition, the green beans 32a were irradiated with red light and blue light from the light source 33 from a position 20 cm above the green beans 32a. The light source 33 used in this test is “ISL-150 × 150H4RR (LED light source) manufactured by CCS” in the case of red light, and “ISL-150 × 150BB manufactured by CCS (LED light source) in the case of blue light. ) ”.

In this case, 15 adult females of Thrips thrips collected in the greenhouse where the melon is cultivated are released immediately after collection at the X position in FIG. 3 (the central position between the green beans 32a and 32b), and the red light Of the kidney beans 32a for 24 hours continuously and then the number of southern thrips colonized on the kidney beans 32a on the side irradiated with red light and the plants on the kidney leaf 32b on the side not irradiated with red light. The number of southern thrips was counted and compared. In this red light irradiation, the light intensity of the red light on the red light irradiation surface (the upper surface of the bean leaf 32a) is 1 × 10 ¹⁷ photons / m ² · sec, 1 × 10 ¹⁸ photons / m ² · sec, The intensity of red light was changed so as to be 1 × 10 ¹⁹ photons / m ² · sec, respectively.

Further, as in the case of red light, female adults of Southern Thrips thrips are released, and after blue light is irradiated only to the kidney beans 32a for 24 hours continuously, the kidney beans 32a on the side irradiated with blue light are irradiated. The number of the southern thrips settled and the number of the southern thrips settled on the kidney leaf 32b on the side not irradiated with blue light were measured and compared. In this blue light irradiation, the intensity of the blue light was set so that the light intensity of the blue light on the surface irradiated with blue light (the upper surface of the kidney beans 32a) was 1 × 10 ¹⁸ photons / m ² · sec. .

The light intensity of 1 × 10 ¹⁷ photons / m ² · sec is a light intensity that makes it difficult for humans to recognize red light under a 1000 lux fluorescent lamp. The light intensity is 1 × 10 ¹⁸ photons / m ² · sec. Is the intensity of light that allows humans to recognize red light and blue light under a 1000 lux fluorescent lamp. This test is repeated twice. The test results are shown in Table 1 below. In Table 1, the ratio of the number of southern thrips settled on kidney beans 32a to the total number of released thrips is shown by thick vertical lines, and southern thrips settled on kidney beans 32b. The ratio of the number is shown by diagonal lines.

  According to this test, for all cases of red light, the southern thrips avoids the bean leaf 32a on the side irradiated with red light and does not irradiate the red light (non-irradiated side in Table 1). It was confirmed that there was a significant difference at the 5% level by chi-square test (x2 test). In Table 1 and Table 2 to be described later, the significant difference is indicated by a mark “*”, and the mark is not given without the significant difference. In contrast to the case of red light, it was confirmed that the southern thrips settled on the kidney leaf 32a on the side irradiated with the blue light when the blue light was irradiated on the green beans 32a.

Further, using the test apparatus, the same test as described above was performed in a greenhouse covered with glass on which sunlight was incident. However, in this case, the distance from the kidney beans 32a and 32b to the X position in FIG. 3 (the central position between the kidney beans 32a and 32b) is 30 cm, and the number of southern thrips at the X position is 30. It was a head. And the test which irradiates sunlight with respect to both the leaves 32a and 32b, and irradiates red light only with respect to the leaf 32a for 24 hours was done. Further, in the red light irradiation, the light intensity of the red light on the red light irradiation surface (the upper surface of the kidney beans 32a) is 1 × 10 ¹⁷ photons / m ² · sec, 1 × 10 ¹⁸ photons / m ² · sec. Thus, the intensity of red light was changed in two types, and the test by irradiation with blue light was omitted. Other conditions are the same as in the above test. This test is also repeated twice. The test results are shown in Table 2 below. The description mode of Table 2 is the same as the description mode of Table 1.

According to the test results in the greenhouse by continuous 24 hours of red light irradiation under sunlight (under sunlight), the light intensity of red light on the surface irradiated with red light is 1 × 10 ¹⁷ photons / m ² · In the case of sec, it was confirmed that the southern blue thrips avoided the kidney beans 32a on the side irradiated with red light and settled on the kidney beans 32b on the side not irradiated with red light. However, when the light intensity of the red light on the irradiated surface of red light is 1 × 10 ¹⁸ photons / m ² · sec, the southern thrips avoids the kidney leaf 32a on the side irradiated with the red light, It was confirmed that the green beans 32b on the side not irradiated with red light settled. From these, in the irradiation of red light added under the irradiation of sunlight, if the light intensity of the red light on the irradiated surface is 1 × 10 ¹⁸ photons / m ² · sec or more, the southern blue thrips avoids red light I understand that

b2. Second Test Next, a second test was performed on the repelling of thrips pests against red light in the melon strain after planting. In this test, seedlings of melon stocks were planted in a greenhouse, and red light, blue light and white light were applied to the melon stock after planting in addition to sunlight irradiation (irradiation of white light only during the day). The light was continuously irradiated for 14 days. In addition, the above test was conducted in the case where no red light, blue light, and white light were irradiated. In this case, the seedlings grown under the sunlight in the greenhouse without being irradiated with red light, blue light and white light were used as the fixed seedlings. Then, the number of larvae and adults per strain of southern blue thrips parasitic on the melon strain 7 days and 14 days after planting was examined. That is, the difference in the fixation of southern blue thrips was examined in four test sections: continuous irradiation of red light, blue light and white light for 24 hours, and no irradiation of red light, blue light and white light. In this test, one melon strain was repeated twice.

  Furthermore, in this second test, as the number of days increased, the leaves were eaten by the southern thrips and the total area of the leaves changed significantly, so the total area of leaves per strain after 14 days was also examined. Then, the number of larvae and adults was divided by the total leaf area, and the number of larvae and adults per unit area was calculated as the test result.

For irradiation in this case, immediately after planting, a red light source, a blue light source, and a white light source were positioned 20 cm above the melon strain. However, since the growth of the melon strain after planting is relatively fast, as the melon strain grows, the red light source, the blue light source, and the white light source are gradually moved upward, and the melon strain grows 20 cm directly above the upper end of the melon strain. Red light, blue light and white light were always irradiated from the position. In addition, as the red light source, the “brand name DELED Plants (LED light source) manufactured by Nabeyoshi Co., Ltd.” used in the above embodiment is used, and the light intensity of the red light on the red light irradiation surface on the upper part of the melon stock is 1.5 × 10 ¹⁹ photons / m ² · sec. As the blue light source, “trade name DELED Plants (LED light source) manufactured by Nabeyoshi Co., Ltd.” that emits blue light having a wavelength band of 400 to 500 nm with the characteristic shown by the dotted line in FIG. 2 is used. The light intensity of blue light on the surface irradiated with blue light is 1.2 × 10 ¹⁹ photons / m ² · sec. As the white light source, “Panasonic's product name LDA6N-H daylight color (LED light source)” that emits white light having a wavelength band of 400 to 800 nm with the characteristic shown by the broken line in FIG. 2 is used. The light intensity of the white light on the light irradiation surface is 1.2 × 10 ¹⁹ photons / m ² · sec.

  The test results are shown in Table 3 below. The symbols a, b, c, and d in Table 3 below are the 5% level according to the Tukey's HSD test with respect to the values of the other test sections where the values in each test section are given other signs. It was confirmed that there was a significant difference in. And about the value in several different test divisions to which the same code | symbol was attached | subjected, it shows having confirmed as the said significant difference between each value. In addition, regarding the values in the test sections to which a plurality of codes (for example, symbols a and b) are attached, the other test section to which one of the plurality of codes (for example, code a or code b) is attached. It is shown that the above value was confirmed as having no significant difference. This type of code is the same in Tables 4 to 6 described later.

  According to this test result, after 7 days, the numbers of adults and larvae in the red light and blue light test groups were smaller than the number of adults and larvae in the non-irradiated test group. However, after 14 days, the numbers of adults and larvae do not change much in all test sections. This is presumably because the leaves were eaten by larvae and adults in the white light and non-irradiated test group, and the area of the leaves was very small. Therefore, referring to the number of larvae and adults per unit area of the leaf, the number of larvae in the red light test group is 1/18 or less of the number of larvae in the non-irradiated test group. The number of adults is 1/3 or less of the number of adults in the non-irradiated test section. However, the number of larvae and adults in the test group of red light is not confirmed to be significantly different from the number of larvae and adults in the test group of blue light and white light. However, the total area of the leaves in the red light test area is much larger than the total area of the leaves in the other test areas. This is presumably because the red light is blocked by the upper leaves and does not easily reach the lower leaves when irradiated with red light from above the melon strain. Therefore, it is considered that the irradiation with red light was effective in suppressing the density of southern thrips. In addition, taking into account the blocking of red light, it is necessary to consider measures such as irradiating red light from the lateral direction of the melon stock.

b3. Third Test Next, a third test was conducted on the hatching suppression effect of southern thrips by direct irradiation with red light. In this test, in a constant temperature room, a plastic petri dish is filled with moistened filter paper, green beans cut approximately 2 cm square, and 10 female adults of Thrips thrips captured in a melon greenhouse. And blue light were irradiated from the top surface for 24 hours, respectively, and a test (non-irradiation test) in which red light and blue light were not irradiated was also performed. That is, in this test, it was divided into three test sections: irradiation with red light for 24 hours, irradiation with blue light for 24 hours, and no irradiation. In this case, as the red light source, “trade name ISL-150 × 150H4RR manufactured by CCS: 660 nm (LED light source)” is used, and as the blue light source, “trade name ISL-150 × 150 BB manufactured by CCS: 470 nm”. (LED light source) ", and the red light source and the blue light source are respectively positioned 20 cm above the plastic petri dish, and the red light and blue light irradiation surfaces of the filter paper and the green beans (the leaves of the green beans) The intensities of red light and blue light were set so that the light intensities of red light and blue light on the surface) were 1 × 10 ¹⁸ photons / m ² · sec, respectively. In all the test sections, the plastic petri dish was placed under a fluorescent lamp of about 1000 lux that was turned on for 16 hours and turned off for 8 hours. That is, even in the non-irradiated section, the plastic petri dish was placed under a fluorescent lamp of about 1000 lux that was turned on for 16 hours and turned off for 8 hours.

  After each irradiation of red light and blue light for 24 hours, and after no irradiation for 24 hours, all female adults are removed, and the plastic petri dish is turned on for 16 hours per day with a fluorescent lamp that is turned off for 8 hours. Under irradiation conditions, the number of larvae hatched after 96 hours was examined. In the test, each test group was repeated 10 times. The test results are shown in Table 4 below.

  According to this test result, the number of first-generation larvae hatched in the red light-irradiated area decreased, and it was confirmed that there was a significant difference at the 5% level by the Tukey HSD test against the decrease in the non-irradiated area It was done. However, although the decrease in the number of hatching in the red light irradiation section was larger than the decrease in the hatching number in the blue light irradiation section, it was not confirmed that there was a significant difference at the 5% level by the Tukey HSD test. Note that all female adults were alive immediately after irradiation with red light and blue light for 24 hours and no irradiation for 24 hours.

b4. 4th test Next, the 4th test about the density inhibitory effect of the southern blue thrips by the irradiation of the red light in the melon seedling raising period, and the influence on a plant body was done. In this test, seeds of melon (variety: Earls Masaharu) were immersed in water for 2 days, seeds whose rooting was confirmed were seeded in a plastic pot, and red light from a red light source was seeded. The seeds (nurturing seedlings) were irradiated during the raising period. As a red light source, “trade name DPDL-R-9W: wavelength 620-630 nm (LED light source) manufactured by Nabei Co., Ltd.” was used. In this test, red light was irradiated in four test sections: 24 hours irradiation, 12 hours daytime irradiation, 12 hours nighttime irradiation, and no irradiation. In this case, the pots were placed in a greenhouse, and 5 pots were simultaneously irradiated with one red light source. The height of the red light source is 110 cm from the top surface of the pot, and the light intensity of the red light on the red light irradiation surface on the top surface of the pot is 1 × 10 ¹⁸ photons / m ² · sec. The intensity of red light was set. Then, the number of larvae, adults and true leaves of the southern blue thrips 7 days, 14 days and 21 days after the start of irradiation was examined. In addition, the seedlings after 21 days were planted in a greenhouse, and the number of days from planting to flowering of female flowers was also examined. The number of leaves is the number of leaves excluding the foliage germinated from the seed. The test was performed 6 times with 5 strains per section. The test results are shown in Table 5 below. In Table 5 below, the number of true leaves is omitted.

  According to this test result, it was confirmed that the number of larvae and adults of Thrips thrips 21 days after sowing decreased in the 24-hour irradiation zone of red light and the 12-hour daytime irradiation zone compared to the non-irradiated zone. (Turkey) HSD test confirmed that there was a significant difference at the 5% level. Moreover, the influence with respect to the number of true leaves (data abbreviation) and female flowering days was not seen.

b5. Fifth Test Next, a fifth test was conducted on the density suppression effect of southern thrips and the effect of natural enemies on the plant body by irradiation with red light after melon planting. In this test, melon (variety: Earls Masaharu) was planted in a greenhouse, immediately after planting of the melon strain (immediately after the start of irradiation with red light), 14 days, 28 days, 42 days later, and 56 The number of southern thrips larvae and adults per leaf was examined after one day. In addition, the number of true leaves was examined after 14 days, 28 days and 42 days, and the number of days from planting to female flowering was also examined. The reason why the number of true leaves after 56 days is not examined is that the upper part of the melon strain was cut for the growth of the melon strain for 42 days. Furthermore, the number of Swarsky cabbage mites, natural enemies of the southern blue thrips, was examined 14 days, 28 days, 42 days and 56 days after the planting of the melon strain. In addition, the seedlings of the melon strain before planting are grown in a closed space where almost no southern blue thrips enter, and the number of larvae and adults of the southern blue thrips immediately after planting is extremely small. In addition, Swarsky red spider mite was released in accordance with the amount used in the agricultural use registration (the amount of Swarsky red spider mite in an amount of 250 ml per are) at the time of planting the melon strain.

In this case, the first test area in which red light is continuously irradiated for 24 hours after the Swarsky red mite is released, and the second light is continuously irradiated with red light for 24 hours without being released. In the test group, the third test group in which only Swarsky burdock mites were released without irradiating red light, and the fourth treatment group in which no red light irradiation and Swarsky burdock mites were released. I went separately. Moreover, as a red light source which emits red light, “trade name DPDL-R-9W: 620-630 nm (LED light source) manufactured by Nabeyoshi Co., Ltd.” was used. As for the height of the red light source, from the planting to the 21st day, the light intensity of the red light on the red light irradiation surface of the melon growth point is 1 × 10 ¹⁸ photons / m ² · sec or more. In addition, the distance between the melon growth point and the red light source was adjusted to 110 cm, and the height of the red light source was fixed after the 21st day after planting.

  In addition, in this test, 12 melon strains were adopted for each test area, and 8 strains excluding 2 at both ends were investigated, and two leaves at the upper and lower positions of each melon strain were examined. Each was extracted, and the number of larvae and adults of southern thrips per leaf was examined. The test was repeated three times. Table 6 shows the numbers of larvae and adults of the southern thrips, which are the test results.

  Moreover, the test result regarding the number of true leaves and the number of days until the flowering of female flowers is shown in Table 7 below, and the test result regarding the number of Swarsky red mite is shown in Table 8 below.

  According to the test results, the decrease in the number of southern blue thrips larvae and adults from 42 days after planting by the irradiation of red light in the first to third test areas or the release of Swarsky red mite was observed in the fourth test group. It was confirmed that there was a significant difference at the 5% level according to the Tukey HSD test (see Table 6). In addition, it was also confirmed that the irradiation with red light and the release of Swarsky burdock mites had no effect on the number of true leaves and the number of female flowering days (see Table 7). In addition, regarding the decrease in the number of Swarsky spider mites, it was also confirmed that there was almost no change after 28 days from planting when irradiated with red light and when not irradiated with red light (see Table 8). Furthermore, referring to Table 6 and Table 8, red light irradiation has no effect on colonization of Swarsky red spider mite (natural enemy of Southern Thrips thrips) on melon stock, and red light irradiation and release of Swarsky red spider mite It can be understood that the combination with is possible and effective.

b6. Sixth Test Next, a sixth test was conducted on the effects of red light irradiation on egg laying, hatching, and the number of next-generation larvae of citrus yellow thrips belonging to thrips. The test equipment used is a glass tube with a diameter of 25 mm and a height of 25 mm, with a sticky and extensible polyethylene butadiene rubber film (manufactured by Tokyo Glass Instrument Co., Ltd., trade name Novix) attached. It was. Hereinafter, this polyethylene-butadiene rubber film is simply referred to as a rubber film.

  First, the egg-laying test of the mandarin orange thrips will be described. A rubber film was affixed to the lower surface of the glass tube and the lower surface was closed. Five adult females of the citrus thrips were placed in the glass tube and tea pollen was added as food. And the rubber film was affixed on the upper surface of the glass tube, the upper surface was closed, water was dripped on the rubber film of an upper surface, and the rubber film was affixed separately on it. This is to cause the orange thrips to mistake the two rubber films on the upper surface of the glass tube as plant leaves.

And the test in the red light irradiation area | region which irradiates the red light from a red light source, and the non-irradiation area which does not emit red light was done. In the red light irradiation zone, the glass tube is placed under a fluorescent lamp, and the red light from the red light source is continuously irradiated for 24 hours, and then eggs laid in water between the two rubber films on the upper surface of the glass tube The number was measured. As the red light source, “CSL ISL-150 × 150H4RR (LED light source) was used, and the glass tube was irradiated with red light having a light intensity of about 1 × 10 ¹⁸ photons / m ² · sec. In the ward, a glass tube was placed under a fluorescent lamp, and 24 hours later, the number of eggs laid in the water between the two rubber films on the upper surface of the glass tube was counted. Fluorescent lamps were turned on for 16 hours, turned off for 8 hours, and placed in an environment of 25 ° C. in both the non-irradiated and non-irradiated areas, and the test was repeated 20 times, and statistical analysis was performed by Student's T test. Table 9 below shows the number of eggs per female adult that is the result of this test.

  According to this test, it was confirmed that the number of laying eggs of the citrus yellow thrips was reduced by irradiating with red light compared to non-irradiated. The effect of red light irradiation on egg laying of the citrus yellow thrips was confirmed to be significantly different at the 5% level by the Student's T-test between the red light irradiation group and the non-irradiation group.

  Moreover, the test of the hatching rate of Citrus thrips will be described. In this case as well, as in the test for the number of eggs laid, 5 adult females of Thrips thrips are placed in a glass tube, cha pollen is added as food, and red light is emitted from the red light source. The test was performed in the irradiated zone and in the non-irradiated zone where no red light was emitted.

  In this test, 5 female thrips of Thrips thrips were laid for 24 hours in both the red light-irradiated and non-irradiated groups, and the number of eggs was counted after removing the female adult from the glass tube. . In this 24-hour egg-laying, the glass tube was placed in an environment of 25 ° C. with the fluorescent lamp turned on for 16 hours, turned off for 8 hours. In this 24-hour egg laying, no red light is irradiated even in the red light irradiation section.

Thereafter, in the red light irradiation section, the glass tube is placed under a fluorescent lamp, and after irradiating the red light from the red light source continuously for 96 hours, an egg that has not yet hatched between the two rubber films on the upper surface of the glass tube The number was counted and the hatching rate of the larvae was calculated. In this case as well, “CSL ISL-150 × 150H4RR (LED light source) is used as the red light source, and the glass tube is irradiated with red light having a light intensity of about 1 × 10 ¹⁸ photons / m ² · sec. In the non-irradiated section, a glass tube was placed under a fluorescent lamp, and 96 hours later, the hatching rate of the larvae was calculated in the same manner as described above. Fluorescent lamps were turned on for 16 hours, turned off for 8 hours, and placed in an environment of 25 ° C. in both the red light irradiation and non-irradiation areas. The test results are shown in Table 10 below.

  According to this test, it was confirmed that the hatching rate of Citrus thrips was reduced by irradiating red light compared to non-irradiated. The effect of red light irradiation on the hatching of Citrus thrips was confirmed to be significantly different at the 5% level by the chi-square test between the red light irradiated group and the non-irradiated group.

  Moreover, the examination of the number of hatching larvae of the citrus thrips will be explained. In this case as well, as in the test of the number of eggs laid and the hatching rate, 5 adult females of Thrips thrips were placed in a glass tube, cha pollen was added as food, and red light from a red light source was irradiated. The test was performed in a red light irradiation zone where no red light was emitted.

In this test, similar to the hatching rate test, 5 female thrips of Thrips thrips are laid for 24 hours, and the adult female is removed from the glass tube. In the red light irradiation section, the glass tube is placed under a fluorescent lamp, and the red light from the red light source is continuously irradiated for 96 hours, and then the number of larvae between the two rubber films on the upper surface of the glass tube is measured. did. In this case as well, “CSL ISL-150 × 150H4RR (LED light source) is used as the red light source, and the glass tube is irradiated with red light having a light intensity of about 1 × 10 ¹⁸ photons / m ² · sec. In the non-irradiated section, the glass tube was placed under a fluorescent lamp, and 96 hours later, the number of larvae was measured in the same manner as described above. In both the irradiated and non-irradiated areas, the fluorescent lamp was turned on for 16 hours, turned off for 8 hours, and placed in an environment of 25 ° C. The test was repeated 10 times, according to Student's T test. Table 11 below shows the number of next-generation larvae as a result of this test.

  According to this test, it was confirmed that the number of next generation larvae of the citrus yellow thrips was reduced by irradiating red light compared to non-irradiated. The effect of red light irradiation on the next generation of Citrus thrips was confirmed to be significantly different at the 5% level by the Student's T-test between the red light irradiation section and the non-irradiation section.

  According to such a sixth test, it has been found that irradiation with red light is effective for suppressing egg-laying, hatching, and the number of next-generation larvae of Citrus thrips. Therefore, it was found that irradiation with red light can also suppress damage to plants caused by citrus yellow thrips.

b7. Seventh Test Next, a seventh test was conducted on the effects of red light irradiation on egg laying, hatching, and the number of next-generation larvae of the black thrips belonging to the thrips. As for the test apparatus, the same apparatus as in the sixth test is used.

  First, the egg-laying test of the Hirazana thrips will be described. In this case, as in the case of the egg-laying test in the sixth test, five female adults of Thrips thrips were placed in a glass tube and tea pollen was added as food.

  And the test in the red light irradiation area | region which irradiates the red light from a red light source, and the non-irradiation area which does not emit red light was done. In this test, the number of eggs laid after 48 hours of continuous irradiation with red light from a red light source was measured in the red light irradiation zone, and the number of eggs laid after 48 hours in the non-irradiation zone was measured. This is different from the egg production test in the sixth test. However, since the red light source, the intensity of the red light, the environmental temperature, the lighting time and the extinguishing time of the fluorescent lamp are exactly the same as the egg-laying test in the sixth test, detailed description is omitted. The test was repeated 10 times and statistical processing was performed by Student's T test. Table 12 below shows the number of eggs per female adult that is the result of this test.

  According to this test, it was confirmed that the number of eggs laid by Thrips thrips was reduced by irradiating with red light compared to non-irradiated. However, the effect of red light irradiation on egg-laying of the black thrips was not confirmed to be significantly different at the 5% level by the Student's T-test between the red light irradiated group and the non-irradiated group.

  Moreover, the examination of the hatching rate of the black thrips will be described. In this case as well, in the same way as in the hatching test in the sixth test, five adult females of Thrips thrips were placed in a glass tube, tea pollen was added as food, and red light from a red light source was irradiated. The test was performed in a red light irradiation section and a non-irradiation section in which no red light was emitted.

  In this test, 5 adult females of Thrips thrips were laid for 48 hours, and the number of eggs was counted after removing the female adults. In this 48-hour egg-laying process, the glass tube was placed in an environment of 25 ° C. with the fluorescent lamp turned on for 16 hours and turned off for 8 hours. In this 48-hour egg-laying, no red light is irradiated even in the red light irradiation section.

  Thereafter, in the red light irradiation section, red light from a red light source was continuously irradiated for 144 hours, and then the number of unhatched eggs was measured to calculate the hatching rate of larvae. In the non-irradiated section, the number of unincubated eggs was measured after 144 hours, and the hatching rate of larvae was calculated. The red light source, light color light intensity, ambient temperature, lighting time and extinguishing time of the fluorescent lamp in this test are exactly the same as the hatching rate test in the sixth test, and detailed description thereof is omitted. The test was repeated 10 times, and statistical processing was performed by Student's T test. The test results are shown in Table 13 below.

  According to this test, it was confirmed that the hatching rate of the thrips was reduced by irradiating red light as compared to non-irradiation. However, the effect of red light irradiation on the hatching rate of the black thrips was not confirmed to be significantly different at the 5% level by the Student's T-test between the red light irradiated group and the non-irradiated group.

  In addition, a test of the number of hatched larvae of the black thrips will be described. In this case as well, in the same manner as in the test for the number of hatching larvae in the sixth test, five female adults of Thrips thrips were placed in a glass tube, cha pollen was added as food, and red light from a red light source was irradiated. The test was performed in a red light irradiation zone where no red light was emitted.

  In this test, in the same manner as the hatchability test, 5 female thrips of Thrips thrips were laid for 48 hours, and the adult female was removed from the glass tube. In the red light irradiation section, red light from a red light source was continuously irradiated for 144 hours, and then the number of larvae between the two rubber films on the upper surface of the glass tube was measured. In the non-irradiated section, the number of larvae was measured in the same manner as described above after 144 hours. The red light source, light color light intensity, ambient temperature, fluorescent lamp turn-on time and turn-off time in this test are exactly the same as the test for the number of hatched larvae in the sixth test, and detailed description thereof is omitted. The test was repeated 10 times, and statistical processing was performed by Student's T test. The test results are shown in Table 14 below.

  According to this test, it was confirmed that the number of next generation larvae of the black-tailed thrips was reduced by irradiating with red light compared to non-irradiated. However, the effect of red light irradiation on the next generation of the black thrips was not confirmed to be significantly different at the 5% level by the Student's T-test between the red light irradiated area and the non-irradiated area.

  According to such a seventh test, it was found that irradiation with red light is effective for suppressing spawning, hatching, and the number of next-generation larvae of the black thrips. Therefore, it has been found that irradiation with red light can also suppress damage to plants caused by Thrips thrips.

b8. Eighth Test Next, an eighth test was conducted on the effect of red light irradiation on the migration of citrus white thrips and white thrips belonging to thrips, and the white fly and cotton aphids that do not belong to thrips. As a test apparatus, as shown in FIG. 4, three cubic plastic containers 41, 42, and 43 having a length of 40 cm, a width of 40 cm, and a height of 40 cm are arranged in a horizontal row under a fluorescent lamp. As the red light source 44, “trade name ISL-150 × 150H4RR (LED light source) manufactured by CCS” was positioned above the container 41. In FIG. 4, the left surface, upper surface, and lower surface of the container 41 are closed, the right surface of the container 41 is released, and a fine net is provided on the front surface and the rear surface of the container 41. The upper and lower surfaces of the container 42 are closed, the left and right surfaces of the container 42 are released, and fine meshes are provided on the front and rear surfaces of the container 42. The right surface, upper surface, and lower surface of the container 43 are closed, the left surface of the container 43 is released, and a fine net is provided on the front surface and the rear surface of the container 43. Accordingly, the containers 41, 42, and 43 are cut off from the outside, and a rectangular parallelepiped continuous space is formed inside. The internal space is vented from the front and rear surfaces.

Then, bean stocks (primary leaf development stage) 45a and 45b are respectively placed in the bottom center of the containers 41 and 43, and the bean stock 45a is about 1 × 10 ¹⁸ photons / m ² · sec from a red light source. Red light with light intensity was irradiated. In this case, the test section (container 41) irradiated with red light is defined as a red light irradiation section, and the test section (container 43) not irradiated with red light is defined as a non-irradiated section.

  Then, 50 female adults of citrus white thrips, adult females of Thrips thrips, male and female adults of whitefly white lice, and cotton aphid worms (female) were released to the container 42 48 hours later. , 45b was counted. The test was performed under two conditions: a temperature of 25 ° C. and fluorescent lamp irradiation conditions (16 hours on and 8 hours off) and a temperature of 25 ° C. and no fluorescent lamp irradiation conditions. The test was repeated three times, and statistical processing was performed by Student's T test. The test results under the fluorescent lamp irradiation conditions are shown in Table 15 below, and the test results under the fluorescent lamp non-irradiation conditions are shown in Table 16 below. In Tables 15 and 16, “*” indicates that there is a significant difference, “**” indicates that there is a significant difference, and “n · s” indicates that there is no significant difference.

  According to the test results under the fluorescent lamp irradiation conditions, it was confirmed that the citrus yellow thrips and the black thrips were less moved and dispersed in the red light irradiation section than in the non-irradiation section. The decrease in the movement dispersion of the red light irradiation to the red light irradiation area was confirmed to be significantly different at the 5% level by the Student's T test between the red light irradiation area and the non-irradiation area. However, it was confirmed that there was no difference in the movement and dispersion of the white fly and cotton aphid, which do not belong to Thrips, between the non-irradiated group and the red light-irradiated group. In addition, according to the test results under the fluorescent light non-irradiation conditions, the citrus white thrips, the white thrips, the white spotted lice, and the cotton aphids all moved to the red light irradiation area.

  In addition, although it seems that it did not affect this test, since the change of the environmental temperature during the 48-hour test was also measured, the measurement result is shown. FIG. 5 shows the change in ambient temperature during the 48 hour test under fluorescent lamp illumination conditions. FIG. 6 shows the change in ambient temperature during the 48-hour test under fluorescent lamp-free conditions. 5 and 6, the solid line shows the temperature change in the red light irradiation area, and the broken line shows the temperature change in the non-irradiation area. The large change in the environmental temperature under the fluorescent lamp irradiation condition seems to be due to the lighting and extinguishing of the fluorescent lamp. Moreover, it seems that the minute change of environmental temperature is due to the change of the operation of the air conditioner for keeping the temperature at 25 ° C.

  According to the eighth test, it has been clarified that, under the fluorescent lamp irradiation conditions, red light irradiation inhibits migration and dispersion of citrus yellow thrips and thrips thrips belonging to thrips on plants. On the other hand, it can be seen that the effect of red light irradiation was not observed for the white fly and cotton aphid, which do not belong to thrips.

b9. Ninth Test Next, a ninth test was conducted on the effect of red light irradiation in combination with a light reflecting sheet on density suppression of southern thrips. As shown in the cross-sectional view of FIG. 7 (A), the test apparatus is installed in a greenhouse, and the upper part is opened to form a square 52 in a bench 51 formed into a square shape. Of melons 53 _x (53 _{1 to} 53 ₁₂ ) were planted in a line along the ridges 52 at regular intervals. Melons 53 _{1 to} 53 ₁₂ were planted on June 4 with a melon strain sown on May 14. And in the 1st and 3rd test section mentioned below, the light reflection sheet 54 (trade name Tyvek 400WP manufactured by DuPont) that covers white is covered on both sides of the melons 53 _{1 to} 53 _12. Arranged. In all test plots described later, 2 g of best guard granules were sprayed per strain at the time of planting.

In this test, the red light irradiation and light reflection sheet arrangement is the first test section, only the red light irradiation is the second test section, only the light reflection sheet arrangement is the third test section, and no treatment is the fourth test section. did. In this case, the first and second test group, five red light source 55, located at both ends of the 12 pieces of melon _{53 1-53 12} melon ₅₃ 1, _{53 12} 10 present except melon 53 ₂ relative to 53 _11, melon ₅₃ 2, 53 _3, and arranged above each intermediate position of the melon ₅₃ 4, 53 _5, melon ₅₃ 6, 53 _7, melon ₅₃ 8, 53 ₉ and melon ₅₃ 10, _{53 11} . As the red light source 55, trade name DPDL-R-9W: wavelength 620-630 nm (LED light source) manufactured by Nabeyoshi Co., Ltd. was used. Irradiation was continued for 24 hours so that the light intensity at the growth point of 10 melons 53 _{2 to} 53 ₁₁ was about 1 × 10 ¹⁸ photons / m ² · sec or more.

In the first to fourth test zones, 10 melons 53 ₂ excluding melons 53 ₁ and 53 ₁₂ at both ends are removed every two weeks from the planting date (June 4) to the harvesting time of August 13th. to 53 ₁₁ upper leaf was measured larvae number and the number of adults of thrips palmi parasitic 3 leaf medium leaves and lower leaves. Each test in the first to fourth test sections was performed in three replicates. In addition, in order to investigate the influence on flower bud formation, the number of days until the first female flowering was also examined.

  FIG. 8 is a graph showing changes in the total number of southern thrips larvae and adults per 30 melon strains in the first to fourth test sections. Table 17 below shows the number of days until the flowering date of female flowers in the first to fourth test sections.

  According to this 9th test, in the 1st test section (combination section of red light and light reflection sheet), the 2nd test section (red light section) and the 3rd test section (light reflection sheet section), the southern The number of larvae and adults of yellow thrips was lower than that in the non-irradiated group. In particular, in the first test group (a combination group of red light and a light reflecting sheet), the number of larvae and adults of southern blue thrips at the harvesting time was the smallest. Furthermore, it turned out that the influence which red light and light reflection sheet installation have on the number of days of female flowering was not seen. Therefore, it turns out that it is effective to use red light and a light reflection sheet together.

b10. Tenth Test Next, a tenth test was conducted on the effect of irradiation with red light on the eggplant and cucumber, which are plants other than melon, on the suppression of thrips generation density. As a test place, as shown in FIG. 9, three ridges 61 having a width of 130 cm are provided in a house having an area of 41 m ² (a frontage of 4.5 m and a depth of 9 m) and a height of ^2.5 m. The house opening was rolled with a 1 mm mesh insect repellent, and the side vinyl was closed at 25 ° C. or lower by an automatic winder. Then, eggplants and cucumbers were planted one by one at intervals of 55 cm between the plants, and 39 plants were planted per house. Eggplants were planted on May 13 and cucumbers were planted on August 28.

The first test zone was a red fluorescent lamp zone, and the second test zone was an untreated zone where no red light was irradiated. In the red fluorescent lamp section, three rows of red light sources 62 are arranged between the ridges 61 at an equal interval approximately 20 cm above the growth point of all eggplants and cucumbers. As the red light source 62, a red fluorescent lamp (trade name: FL20SR, manufactured by Panasonic Corporation, peak wavelength: 660 nm) and a red film (trade name: NK92050R, manufactured by Panasonic Corporation) that removes a wavelength of 600 nm or less is wound. Using. The length of each red light source 62 is 100 cm. With regard to light intensity, in eggplant, the light intensity near the growth point has a maximum value of 3.9 × 10 ¹⁹ photons / m ² · sec, a minimum value of 1.3 × 10 ¹⁸ photons / m ² · sec, and an average value of 2. It was 0 × 10 ¹⁹ photons / m ² · sec. In cucumber, the light intensity near the growth point has a maximum value of 2.6 × 10 ¹⁹ photons / m ² · sec, a minimum value of 8.8 × 10 ¹⁷ photons / m ² · sec, and an average value of 1.6 × 10 ¹⁹ photons. / M ² · sec.

  In the red fluorescent lamp section, red light was continuously irradiated for 24 hours from May 13 to July 2 when planting the eggplant. The cucumber was continuously irradiated with red light for 24 hours from August 28 to October 15 at the time of planting. In the red fluorescent lamp section, a light reflecting sheet (trade name Tyvek 700AG manufactured by DuPont) was laid in the passage between the eaves 61.

  The survey method is 7 times every 7 days from May 20 to July 2 in eggplant, 7 times every 7 days from September 4 to October 15 in cucumber, red fluorescent lamp zone and no treatment The number of thrips inhabitants was examined on the upper and middle two leaves (total 60 leaves) of 30 strains in each ward. However, since the occurrence of multiple types of thrips was seen in eggplant, 28 adult thrips that lived in the leaves on June 24th were captured in the untreated area, and the species was identified with a stereomicroscope. However, 54% were Negia thrips and 46% were Southern thrips. In the cucumber, southern thrips were dominant.

  In eggplants, an air blocking agent was sprayed on May 23 and June 19. The cucumber was not sprayed.

  FIG. 10A shows changes in the number of adult thrips per eggplant leaf in the red fluorescent lamp group and the untreated group, respectively. FIG. 10B shows the change in the number of thrips larvae per eggplant leaf in the red fluorescent lamp group and the untreated group, respectively. FIG. 11 (A) shows the change in the number of adult southern thrips per leaf of cucumber in the red fluorescent lamp group and the untreated group, respectively. FIG. 11 (B) shows the change in the number of southern thrips larvae per cucumber leaf in the red fluorescent lamp group and the untreated group, respectively.

  According to the tenth test, also in eggplant, the density of thrips (negia thrips and southern thrips) in the red fluorescent light section decreased compared to the untreated section. Thereby, even in eggplant, it turns out that there is a density suppression effect of thrips by combined use of red light irradiation and a light reflection sheet. Also in cucumber, the density of southern blue thrips in the red fluorescent light section was significantly reduced compared to the untreated section. Thereby, in cucumber, it turns out that the density inhibitory effect of southern black thrips by combined use of red light irradiation and a light reflection sheet is high.

c. Other Application Examples Further, according to the first to tenth tests, density suppression and egg-laying suppression of thrips that are micro pests on melon strains were confirmed. In particular, we identified the southern blue thrips, the black thrips, the red thrips and the white thrips belonging to the thrips. Since other pests belonging to the thrips that are similar to the various thrips also have similar properties to the various thrips, the present invention is effective for the establishment of other pests belonging to the thrips and the suppression of spawning. Can also be applied.

  Moreover, according to the 10th test, the density suppression of the pest which belongs to the said thrips in eggplant and cucumber was also confirmed. Therefore, irradiation with red light has an effect of suppressing the density of pests belonging to the thrips in eggplant and cucumber in addition to melon. Thrips pests also settle and lay eggs in vegetables (plants) such as bell peppers, green onions, etc. other than melon, eggplant and cucumber, and flower buds (plants) such as carnations, roses, and chrysanthemum. It is known to harm plants. Therefore, as in the above embodiment, if these plants are irradiated with the red light of the above embodiment (or if the red light irradiation and the light reflection sheet are used in combination), the thrips to these plants are used. It is also possible to prevent damage from the pests to which they belong. That is, the target plant irradiated with the red light of the present invention (or used in combination with the red light irradiation and the light reflecting sheet) may be a plant other than melon, eggplant, and cucumber, such as pepper, leek, carnation, rose, chrysanthemum. Good.

DESCRIPTION OF SYMBOLS 10 ... Greenhouse, 11 ... Cultivated soil, 12, 44, 55, 62 ... Red light source, 13 ... Fluorescent lamp, 14 ... Heating device, 20A ... Melon stock in seedling state, 20B ... Melon stock after planting, 31 , 54 ... Light reflecting sheet, 32a, 32b, 45a, 45b ... Green beans leaf, 33 ... Light source, 41 to 43 ... Container, 51 ... Bench, 52, 61 ... Firewood, 53 ₁ -53 ₁₂ , 53 _x ... Melon

Claims (7)

  A method for controlling a pest of a plant, which irradiates the target plant with red light from a red light source and suppresses the establishment of the pest and the egg laying on the target plant. ^{2. The} method for controlling plant pests according to claim 1, wherein the light intensity of the red light on the red light irradiation surface of the target plant is 1 × 10 ¹⁸ photons / m ² · sec or more.   The plant pest control method according to claim 1, wherein the pest is a pest belonging to thrips including Thrips thrips, Citrus thrips, Japanese thrips, and Thrips thrips.   The method for controlling pests of a plant according to any one of 1 to 3, wherein the target plant is melon, eggplant, or cucumber.   The method for controlling pests of a plant according to any one of claims 1 to 4, wherein the target plant is grown in a greenhouse.   The plant insect pest control method according to any one of claims 1 to 5, wherein the red light is applied to the target plant body together with sunlight or light from a fluorescent lamp.   The plant pest control method according to any one of claims 1 to 6, wherein a light reflecting sheet is laid at a place where the target plant is planted.

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