JPWO2017110455A1 - Pest control material and pest control method using the same - Google Patents

Abstract

The pest control material of the present disclosure includes a carrier and a room temperature volatile pyrethroid compound retained on the carrier, and at least an amount of the room temperature volatile pyrethroid compound represented by the following formula (I) is represented by the carrier Is held in.
Retention amount (mg) = 100 mg + A × B (I)
A: Maximum volatilization amount per day of a room temperature volatile pyrethroid compound (mg / day)
B: Use period (days)

Description

  The present disclosure relates to a pest control material that can stably exhibit an excellent control effect from the start to the end of use and a pest control method using the same.

  Conventionally, insect repellent materials in which a drug holding body such as a net is impregnated with a drug have been reported (for example, Patent Documents 1 and 2). Such an insect repellent material uses a natural transpiration agent such as transfluthrin or methfluthrin as the agent, and prevents flying insects from entering a house or the like. Such insect repellents generally have a fixed period of use.

  Such an insect repellent material exhibits a sufficient insect repellent effect at the beginning of use with a large amount of drug impregnation. However, as the end of use is approached, the efficacy decreases with a decrease in the amount of the impregnated drug, and there is a problem that stable efficacy cannot be exhibited from the start of use to the end of use.

JP 2008-194034 A JP 2011-19507 A

  An object of the present disclosure is to provide a pest control material and a pest control method that can stably exhibit an excellent control effect from the start to the end of use.

The pest control material of the present disclosure includes a carrier and a room temperature volatile pyrethroid compound retained on the carrier, and at least an amount of the room temperature volatile pyrethroid compound represented by the following formula (I) is represented by the carrier Is held in. Furthermore, the pest control method according to the present disclosure includes at least 0.05 μg / m of a room temperature volatile pyrethroid compound from a carrier on which a room temperature volatile pyrethroid compound in an amount represented by the following formula (I) is held. Volatilize to an air concentration of ³ .
Retention amount (mg) = 100 mg + A × B (I)
A: Maximum volatilization amount per day of a room temperature volatile pyrethroid compound (mg / day)
B: Use period (days)

  According to the present disclosure, a stable and excellent pest control effect is exhibited from the start to the end of use.

It is explanatory drawing for demonstrating the method of the penetration | invasion inhibition test (under semi-natural environment) performed in Example 1 and 2. FIG. It is explanatory drawing for demonstrating the method of the penetration | invasion inhibition test (under natural environment) performed in Example 3 and Comparative Example 1. FIG. It is explanatory drawing for demonstrating the verification method of the knockdown effect performed in Example 4 and 5. FIG. It is explanatory drawing which shows the test apparatus for measuring the volatilization amount used in Example 7, FIG. 4 (A) shows the external appearance of a test apparatus, FIG.4 (B) shows the inner side of a test apparatus. It is explanatory drawing which shows the test apparatus for measuring the air | atmosphere density | concentration used in Examples 8-11, FIG. 5 (A) shows the external appearance of a test apparatus, FIG.5 (B) shows the inner side of a test apparatus. . FIG. 10 is an explanatory diagram for explaining a method of a 60-day field test performed in Example 12.

  The pest control material of the present disclosure includes a carrier and a room temperature volatile pyrethroid compound (hereinafter sometimes simply referred to as “pyresroid compound”) held on the carrier. In this specification, “control” refers to preventing the invasion of pests (repelling), extinguishing the pests (insecticidal), knocking down the pests, and causing the pests to be uncomfortable (for example, blood sucking behavior, biting behavior) Etc.) means at least one of preventing the occurrence of the above.

  The carrier used for the pest control material of the present disclosure is not particularly limited as long as it can hold a pyrethroid compound. Examples of the carrier material include yarn (twisted yarn, etc.), non-woven fabric, wood, pulp (paper), inorganic polymer substance, inorganic porous substance (silicate, silica, zeolite, etc.), organic polymer substance (cellulose, Polyester, polyethylene, polypropylene, polyvinyl alcohol, etc.). Further, a carrier capable of holding several times or more of its own weight, for example, a highly absorbent polymer, cotton, sponge, open cell foam, or the like may be used.

  The shape of the carrier is not particularly limited, and may be appropriately set depending on the volatilization method. For example, when the pest control material of the present disclosure is for natural volatilization, it is preferable to use a sheet-like carrier having a network structure so that the pyrethroid compound is efficiently released into the atmosphere. Examples of the sheet-like carrier having a network structure include a cloth having a large number of continuous or intermittent voids such as a net shape, a mesh shape, and a lace shape. The weft and warp that form such a fabric may be straight or zigzag.

  In the case of natural volatilization, the pest control material of the present disclosure is usually used by being suspended in a window, door, room or the like. In this case, the pyrethroid compound held on the sheet-like carrier having a network structure tends to be biased in the direction of gravity. In order to prevent the occurrence of bias even when suspended, it is preferable to employ, for example, a material that can be impregnated with a pyrethroid compound in the weft and a non-impregnated material in the warp. When the carrier is formed in this way, the drug impregnated in the weft yarn is fixed by the warp yarn every fixed width, so that it is difficult to cause a bias.

The size of the carrier is appropriately set in consideration of the type of pyrethroid compound to be retained, the period of use of the pest control material, and the like. For example, a carrier having such a size that the pyrethroid compound remains at a concentration of at least 1 mg / cm ² at the end of use of the pest control material is preferable. In the case of a sheet-like carrier having a network structure, the retention concentration is calculated by the area obtained by subtracting the area of the opening from the area of the sheet-like carrier. The sheet-like carrier having a network structure preferably has an area of about 50 to ²⁰⁰ cm ² and an opening ratio of about 5 to 30%. By using a sheet-like carrier having such a network structure, the retention amount of the pyrethroid compound represented by the formula (I) can be retained at a sufficient drug concentration.

  The pyrethroid compound held on such a carrier is not particularly limited, and examples thereof include transfluthrin, metfurthrin, profluthrin, empentrin, teraleslin, framethrin, tephrametrin, dimethrin, dimeflutrin, and mepafluthrin. A pyrethroid type compound may be used independently and may use 2 or more types together.

In the pest control material of the present disclosure, the pyrethroid compound is held on the carrier at a holding amount represented by at least the following formula (I). When the pyrethroid compound is held in such a holding amount, an excellent control effect is stably exhibited from the start to the end of use.
Retention amount (mg) = 100 mg + A × B (I)
A: Maximum volatilization amount of pyrethroid compound per day (mg / day)
B: Use period (days)

  “100 mg” in the formula (I) is an important factor in the pest control material of the present disclosure. That is, if 100 mg of the pyrethroid compound is retained on the carrier, the pyrethroid compound is found to be volatilized at an air concentration sufficient to control the pest, and the pest control material of the present disclosure has been made. . When the amount to be retained is less than 100 mg, the pyrethroid compound is not volatilized at a concentration in the air sufficient to control pests, and the control effect is not exhibited.

The amount obtained by multiplying the maximum volatilization amount per day (mg / day) of the pyrethroid compound to be used by this “100 mg” and the usage period (days) of the control material may be added to obtain the retention amount. The volatilization amount (volatilization rate) per day increases as the temperature increases, and decreases as the temperature decreases. Therefore, the maximum volatilization amount per day may be defined in consideration of the summer temperature when the temperature is highest. When the average daily temperature is 30 ° C., the maximum volatilization amount per day of the main pyrethroid compounds is as follows.
Transfluthrin: 4.5 mg / day Metofluthrin: 2.0 mg / day Profluthrin: 4.5 mg / day

The pyrethroid compound is preferably held on the carrier at least in the holding amount represented by the following formula (I) ′.
Retention amount (mg) = 200 mg + A ′ × B ′ (I) ′
A ′: Maximum volatilization amount per day of the pyrethroid compound (mg / day)
B ': Use period (days)

  Among the pyrethroid compounds, for example, transfluthrin is preferably held on the carrier at least in the holding amount represented by the formula (I) ′.

  For example, when using transfluthrin as a pyrethroid compound to obtain a control material for 60 days, at least 370 mg (100 mg + 4.5 mg / day × 60 days), preferably at least 470 mg (200 mg + 4.5 mg / day × 60 days) Transfluthrin may be held on a carrier. If the control material is used for 120 days, at least 640 mg (100 mg + 4.5 mg / day × 120 days), preferably at least 740 mg (200 mg + 4.5 mg / day × 120 days) of transfluthrin may be held on the carrier.

The concentration at which the pyrethroid compound is held on the carrier is not particularly limited. In order to evaporate efficiently and naturally, the pyrethroid compound is held on the carrier at a concentration of, for example, at least 2 mg / cm ² , preferably at least 2.5 mg / cm ² , more preferably at least 3 mg / cm ² . The upper limit is not particularly limited, and is about 7 mg / cm ² at the maximum considering the saturation amount that can be held on the carrier. Since the retention amount (total amount) of the pyrethroid compound varies depending on the type of compound, the period of use, etc., the concentration may be adjusted depending on the size of the carrier.

  The method for holding the pyrethroid compound on the carrier is not particularly limited. For example, a method of dropping or spraying a pyrethroid compound on a carrier, a method of impregnation, a method of kneading and the like can be mentioned. When holding a pyrethroid compound on a carrier, the pyrethroid compound may be dissolved in a solvent. Examples of the solvent include water, alcohols (such as methanol and ethanol), ethers (such as tetrahydrofuran and dioxane), aliphatic hydrocarbons (such as hexane, paraffin, liquid paraffin, and petroleum benzine), and esters (such as ethyl acetate). Etc.

As described above, the pyrethroid compound is preferably retained at a retention concentration such that the pyrethroid compound remains at a concentration of at least 1 mg / cm ² at the end of use of the pest control material. Furthermore, the insect pest control material of the present disclosure includes a perfume, an antioxidant, a deodorant, a dye, a chelating agent, a surfactant, a retention agent, pH, as long as the effect of the present disclosure is not impaired in addition to the pyrethroid compound. Additives such as regulators, bactericides, and fungicides may be included.

  The pest control material of the present disclosure is usually used for natural volatilization, for example, installed in a windy environment. “In an environment with wind” means an environment in which airflow is naturally or forcibly generated. Examples of the forced airflow include an airflow generated by a blowing unit such as a fan, a blower, and an air conditioner, an airflow generated by opening / closing a door, a shoji, and a window, an airflow generated by a fan or a fan, and the like.

The method for using the pest control material according to the present disclosure is not particularly limited. For example, it is used by being suspended in a window, a door, a room or the like. In order to exert a pest control effect, the pyrethroid compound may be volatilized so that the concentration in the air is at least 0.05 μg / m ³ , preferably 0.1 μg / m ³ . For example, when transfluthrin or profluthrin is used, it is preferably volatilized to have an air concentration of at least 0.5 μg / m ³ . In the case of using metfurthrin, it is preferable to volatilize it so that the air concentration is at least 0.05 μg / m ³ . If the pyrethroid compound is volatilized in the air concentration as described above near the entrance of the pest, the repellent effect is exerted against the pest approaching the entrance, and against the pest that has already entered. The knockdown effect is demonstrated.

  The pest control material of the present disclosure exhibits a stable and excellent pest control effect from the start to the end of use. The pests that can be controlled by the pest control material of the present disclosure are not particularly limited, and examples thereof include various sanitary pests, agricultural pests, and unpleasant pests, and are particularly preferably used for flying pests. Examples of flying pests include mosquitoes such as Aedes albopictus, Akaieka, Shinamadaraka, Kotatakaikaeka, Aedes albopictus, Aedes albopictus; flies such as fly flies; Nukaka such as Tokunagakurozukaka, Oshimamanukaka, and chicknutka; bees such as Kirosuzubee, Sesuroga wasp and honeybee; ants such as honeybees; and other pests having landing behavior.

  Hereinafter, the pest control material and the pest control method of the present disclosure will be specifically described with reference to examples and comparative examples, but the pest control material and the pest control method of the present disclosure are not limited to these examples. .

(Example 1: Invasion inhibition test under quasi-natural environment)
<Treatment zone>
As shown in FIG. 1, a 12 tatami room 11 was installed in a test area 1 of about 100 m ² . A space other than the living room 11 is referred to as an outside room 12. The height of the test area 1 was 3.5 m, and the height of the living room 11 was 2.4 m. Next, a sample was obtained by impregnating a carrier with a mixture of 200 mg of transfluthrin and 100 mg of liquid paraffin. As the carrier, a mesh polyester carrier having a length of 14 cm, a width of 9 cm, and an opening ratio of 15% was used. In addition, in the following tests, when there was no description in particular, it implemented at environmental temperature 20-30 degreeC.

  150 female adults of Aedes albopictus were released outside the room 12 and allowed to acclimate for 1 hour. Thereafter, the test room 14 was entered into the living room 11 and was allowed to stand in the center of the living room 11. The entrance of the living room 11 was opened 10 cm to form an opening 15. The obtained specimen 13 was suspended at a position 180 cm from the floor of the opening 15. Using the tester 14 as an attracting source, the number of Aedes albopictus that entered the living room 11 was counted every 10 minutes until 30 minutes after the start of the test. The number of heads that invaded in 30 minutes was defined as the total number of intrusions in the treatment area.

<No treatment zone>
The number of Aedes albopictus that entered the living room 11 was counted in the same procedure as in the above-mentioned treatment section except that the sample 13 was not used. The number of heads that invaded in 30 minutes was defined as the total number of intrusions in the untreated section. The invasion inhibition rate was determined using the following formula (II). The same test was performed twice, and the average of the invasion inhibition rate was obtained. The results are shown in Table 1.
Invasion inhibition rate (%) = {1− (total number of intrusions in treated area / total number of intrusions in untreated area)} × 100 (II)

(Example 2)
A test was performed in the same manner as in Example 1 except that the amount of transfluthrin used was changed to 300 mg and the amount of liquid paraffin used was changed to 150 mg, and the invasion inhibition rate of human striped mosquito was determined. The same test was performed twice, and the average of the invasion inhibition rate was obtained. The results are shown in Table 1.

  As shown in Table 1, when the amount of transfluthrin used was 200 mg and 300 mg, it was 80% or more. Therefore, it can be seen that if the carrier is impregnated with at least 100 mg, preferably at least 200 mg of transfluthrin, it exhibits an excellent invasion inhibiting effect.

(Example 3: Invasion inhibition test under natural environment)
<Treatment zone>
As shown in FIG. 2, a test chamber 2 composed of an 8-tatami living room 21 provided with an opening 22 in one place was set up in a natural environment where mosquitoes including Aedes albopictus live. The height of the living room 21 was 2.4 m, and the height and width of the opening 22 were 1.9 m and 0.8 m, respectively. Next, a sample was obtained by impregnating a carrier with a mixture of 200 mg of transfluthrin and 100 mg of liquid paraffin. The same carrier as in Example 1 was used as the carrier.

  The examiner was allowed to enter the living room 21, and the obtained specimen 23 was suspended above the opening 22. The dry ice 24 was placed outside the opening 22 as an attracting source, and the number of mosquitoes including the human striped mosquito that entered the room 21 was counted for 3 hours. This number was used as the total number of intrusions in the treatment area.

<No treatment zone>
The number of mosquitoes including human striped mosquitoes that entered the living room 21 was counted in the same procedure as in the above-mentioned treatment section except that the sample 23 was not used. This number was taken as the total number of intrusions in the untreated area. The invasion inhibition rate was determined using the above formula (II). The same test was performed 3 times, and the average of the invasion inhibition rate was obtained. The results are shown in Table 2.

(Comparative Example 1)
A test was performed in the same manner as in Example 3 except that the amount of transfluthrin used was changed to 50 mg, and the invasion inhibition rate of mosquitoes including human striped mosquito was determined. The results are shown in Table 2.

  As shown in Table 2, it can be seen that when the amount of transfluthrin used is 200 mg, the invasion inhibition rate exceeds 80% even in a natural environment, and an excellent invasion inhibition effect is exhibited. On the other hand, in the case of 50 mg, it is less than 80%. Therefore, from Examples 1 to 3, if at least 100 mg, preferably at least 200 mg of transfluthrin remains at the end of the use of the pest control material, a stable and excellent control effect can be obtained from the start to the end of use. It can be seen that it is demonstrated.

(Example 4: Verification of knockdown effect)
Next, the knockdown effect was verified according to the cage method. As shown in FIG. 3, a specimen 31 was installed at a position 120 cm from the floor surface in a substantially central part of an 8-tatami test room 3 (height 2.4 m). The specimen 31 used was obtained by impregnating a mixture of 200 mg transfluthrin and 100 mg liquid paraffin into the same carrier as in Example 1. Next, four test cages 32 containing 20 female adult mosquitoes were prepared. Two test cages 32a were installed at a position 75 cm from the floor so as to be symmetrical about the specimen 31. The remaining two test cages 32b were placed symmetrically about the specimen 31 at a position 150 cm from the floor surface. All the test cages 32 were installed 130 cm away from the specimen 31. The number of cuttlefish knocked down was observed at regular intervals, and the time (KT50) at which half of the cuttlefish knocked down was measured. After 6 hours from the start of the test, the specimen 31 and the test cage 32 were removed (exposure for 6 hours), and the squid was transferred to a clean polycup. Thereafter, lethal observation was performed 24 hours later, and the lethal rate was determined. The results are shown in Table 3.

  KT50 was measured in the same procedure as above except that the test room 3 was changed to a 12-tatami test room (height 2.4 m) instead of the 8-tatami test room 3, and the lethality was obtained. The results are shown in Table 3.

(Example 5)
KT50 was measured by the same procedure as in Example 4 except that the specimen 31 was removed 8 hours after the start of the test (8 hours exposure), and the mortality was further determined. The results are shown in Table 3.

  As shown in Table 3, it can be seen that even if pests enter the room, a high lethal effect is exhibited by exposure to the specimen for 6 hours or more. In addition, the lethality after 24 hours when exposed for 12 hours or more was 100%. In this way, it can be seen that pests that have entered the room can also be controlled.

(Example 6: Verification of blood sucking inhibitory effect)
Two cylinders made of PET (inner diameter: 4.5 cm and length: 12 cm) were prepared, and about 10 adult females of Aedes albopictus were placed in each cylinder, and both ends of the cylinder were closed with mesh fabric. Next, a specimen was placed at a position 120 cm from the floor in the approximate center of the test chamber (8 tatami mats, height 2.4 m) used in Example 4. The same sample as in Example 4 was used. A cylinder filled with Aedes albopictus was placed 130 cm away from the specimen and 75 cm from the floor. The two cylinders were placed so as to be symmetric about the specimen.

Ten minutes after the start of the test (exposure time to Aedes albopictus 10 minutes), two cylinders were removed from the test chamber, the palms were held close to both ends of the cylinder and held for 3 minutes, and the number of heads that performed blood-sucking behavior was counted The blood absorption inhibition rate was determined using the formula (III). The hands were released from both ends of the cylinder, and after 10 minutes (exposure for 20 minutes), the number of heads that had sucked blood was counted in the same procedure, and the blood sucking inhibition rate was determined. The blood sucking inhibition rate was determined in the same procedure until the exposure time to the specimen reached 60 minutes. The same test was repeated twice, and the average of the blood sucking inhibition rate was obtained. The results are shown in Table 4.
Blood absorption inhibition rate (%) = {1− (X / Y)} × 100 (III)
X: Number of heads that sucked blood
Y: Number of blood sucking actions before specimen exposure

  As shown in Table 4, it can be seen that the blood absorption inhibition rate exceeds 80% when exposed to the specimen for at least 50 minutes. This indicates that blood sucking behavior is not performed even if knockdown is not performed, which indicates that the damage caused by stinging can be reduced.

(Example 7: volatilization amount per day)
As shown in FIG. 4A, a test apparatus 4 for measuring the volatilization amount was prepared. The test apparatus 4 is made of a plastic box 41 (a cube having a side of 1 m), and air intake holes 42 are provided at two locations on the ceiling surface of the box 41. On the other hand, an exhaust hole 43 is provided at one place on the bottom of the side surface of the box 41. The exhaust hole 43 is provided so that the air in the box 41 is exhausted at a rate of 17 L / min, that is, the air in the box 41 is exhausted in approximately one hour. As shown in FIG. 4B, a small fan 44 was installed in the box 41 and the air in the box 41 was circulated. Next, five specimens 45 were hung at substantially the center in the box 41. As the specimen 45, the same carrier as in Example 1 was used in which 500 mg of transfluthrin and 250 mg of liquid paraffin were impregnated.

  The test proceeded with the temperature in the box 41 maintained at 20-25 ° C. Samples were collected 9 days, 20 days, 41 days and 60 days after the start of the test, and the total volatilization amount (mg) was determined from the remaining amount of the drug. Further, the total amount of volatilization was divided by the product of the number of days and the number of specimens installed to determine the amount of volatilization per day (volatilization rate (mg / day)). The test was performed 4 times in the same procedure, and the average of the volatilization rate was obtained. The results are shown in Table 5.

  Furthermore, the total volatilization amount (mg) and the volatilization rate (mg / day) were determined in the same procedure except that the temperature in the box was changed to 30 to 35 ° C. The test was performed 4 times in the same procedure, and the average of the volatilization rate was obtained. The results are shown in Table 5.

  As shown in Table 5, under normal temperature (20 to 25 ° C.) conditions, the transfluthrin volatilization amount (volatilization rate) is about 1.1 to 1.4 mg / day, and under high temperature conditions (30 to 35 ° C.). ) Under the conditions, it is found to be about 3.7 to 4.5 mg / day. For example, in the summer season (July and August) when the volatilization amount is the largest, the maximum volatilization amount per day can be assumed to be about 4.5 mg / day in consideration of the daily temperature change. Therefore, when preparing a pest control material for 60 days (for 60 days) from the start to the end of use, if the carrier is impregnated with at least 470 mg (200 mg + 4.5 mg × 60 days) of transfluthrin, after 60 days (end) At least 200 mg of transfluthrin remains. As a result, a stable and excellent control effect is exhibited from the start to the end of use.

(Example 8: Measurement of air concentration of transfluthrin)
As shown in FIG. 5A, a test apparatus 4 ′ similar to the test apparatus 4 shown in FIG. 4A was prepared except that the collection hole 46 was provided in the box 41. Next, as shown in FIG. 5B, as in Example 7, a small fan 44 was installed in the test apparatus 4 ′, and the air in the box 41 was circulated. Subsequently, the same five specimens 45 as those in Example 7 were suspended at a substantially central portion in the box 41.

The temperature in the box 41 was maintained at 20 to 25 ° C. to volatilize the drug from the specimen 45. At the elapse of a predetermined period shown in Table 6 from the start of the test, the air in the box 41 was sucked from the collection hole 46 at a rate of 17 L / min for about 1 hour while exhausting was stopped. The suction was performed using a silica gel trap shown below. Quantitative analysis of transfluthrin collected in a silica gel trap was performed.
<Silica gel trap>
Absorbent cotton was inserted into one end of a glass tube having an inner diameter of 15 mm and a length of 100 mm. About 1 g of silica gel (Wakogel C-100, manufactured by Wako Pure Chemical Industries, Ltd.) was filled in the glass tube. Thereafter, another absorbent cotton was inserted into the glass tube (that is, both ends of the glass tube were plugged with absorbent cotton) to obtain a silica gel trap.

Quantitative analysis of transfluthrin collected in the silica gel trap was performed, and the air concentration of transfluthrin in the box 41 was determined from the obtained value using the following formula (IV). The same test was performed twice, and the average concentration in the air was determined. The results are shown in Table 6.
Air concentration (μg / m ³ ) = R × 1000 (L) / S (IV)
R: quantitative value of transfluthrin (μg)
S: Air suction amount of integrated flow meter (L)

Example 9
The airborne concentration of transfluthrin was determined in the same manner as in Example 8, except that the temperature in the box 41 was maintained at 30 to 35 ° C. The same test was performed twice, and the average concentration in the air was determined. The results are shown in Table 6.

As shown in Table 6, in Example 8 (20 to 25 ° C.), it can be seen that the air concentration of transfluthrin in the box 41 is at least 86 μg / m ³ during the test period. That is, it is found that the amount per sample is at least 17 μg / m ³ (86 μg / 5). For example, when this specimen is used in a room with 12 tatami mats (about 19.8 m ² , height 2.4 m), the air concentration in the room is about 0.36 μg / m ³ (17 μg / 47.52 m ³ ). In the case of 8 tatami mats (about 13.2 m ² , height 2.4 m), it is about 0.54 μg / m ³ (17 μg / 31.68 m ³ ). A drug such as transfluthrin usually tends to volatilize at a higher temperature, so it can be seen that Example 9 having a higher test temperature has a higher concentration in the air than Example 8.

(Example 10: Measurement of airborne concentration of metfurthrin)
Implemented, except that 200 mg of metfurthrin and 400 mg of liquid paraffin were used instead of transfluthrin, and the air in the box 41 was sucked at a rate of 17 L / min for about 1 hour after the predetermined period shown in Table 7 from the start of the test. In the same procedure as in Example 8, the air concentration of metfurthrin was determined. The same test was performed twice, and the average concentration in the air was determined. The results are shown in Table 7.

(Example 11)
Except for maintaining the temperature in the box 41 at 30 to 35 ° C., the air concentration of metfurthrin was determined in the same manner as in Example 10. The same test was performed twice, and the average concentration in the air was determined. The results are shown in Table 7.

As shown in Table 7, in Example 10 (20-25 ° C.), it can be seen that the airborne concentration of methfluthrin in the box 41 is at least 17 μg / m ³ during the test period. That is, it is found that the amount per sample is at least 3.4 μg / m ³ (17 μg / 5). For example, when this sample is used in a 12 tatami room, the air concentration in the room is about 0.07 μg / m ³ (3.4 μg / 47.52 m ³ ), and in the case of 8 tatami mats, the air concentration is about 0.07 μg / m ³ . 11μg / m ³ a (3.4μg / 31.68m ^3). It can be seen that a drug such as metfurthrin usually tends to volatilize at a higher temperature, so that Example 11 having a higher test temperature has a higher concentration in the air than Example 10.

(Example 12: 60-day field test)
<Treatment zone>
As shown in FIG. 6, the test room 5 composed of an 8 tatami room 51 provided with a door 52 at one place was set up in a natural environment where mosquitoes including human mosquitoes live. The height of the living room 51 was 2.4 m, and the height and width of the door 52 were 2.1 m and 0.85 m, respectively. Next, a specimen 53 was obtained by impregnating a carrier with a mixture of 500 mg of transfluthrin and 250 mg of liquid paraffin. The same carrier as in Example 1 was used as the carrier.

  The door 52 was fully opened, and the obtained specimen 53 was suspended above the entrance to the living room 51. Next, dry ice 54 was placed as an attraction source outside the vicinity of the entrance / exit. On the first day and 60 days later, the number of mosquitoes that entered the room 51 at about the same time for 3 hours each morning and evening was counted. The total number of heads in the morning and evening was taken as the total number of intrusions in the treatment area.

<No treatment zone>
A test chamber similar to the above-described treatment section was installed next to the test chamber 5 except that the sample 53 was not used. The number of mosquitoes that entered the living room 51 was counted in the same procedure as in the above treatment section. The total number of heads in the morning and evening was taken as the total number of intrusions in the untreated area.

  The intrusion inhibition rate was determined from the total number of intrusions in the treated area and the total number of intrusions in the untreated area using the above formula (II). The invasion inhibition rate on the first day of the test (at the start of use) was 88%. On the other hand, the penetration inhibition rate 60 days after the start of the test (at the end of use) was 81%. Thus, the penetration inhibition rate exceeds 80% even at the end of use, and the pest control material of the present disclosure maintains a high penetration inhibition rate from the start to the end of use, and has an excellent penetration inhibition effect It can be seen that

(Example 13: Invasion inhibition test under quasi-natural environment)
<Treatment zone>
In the test area 1 (FIG. 1) used in Example 1, a test area in which an 8 tatami room was installed instead of the 12 tatami room 11 was prepared. A space other than the living room is assumed to be outside the room (corresponding to outside room 12 in FIG. 1). The height of this test area was 3.5 m, and the height of the living room was 2.4 m. Next, a sample was obtained by impregnating a carrier with a mixture of 100 mg of metfurthrin and 200 mg of liquid paraffin. The same carrier as in Example 1 was used as the carrier.

  Outside the room, 150 adult females of Aedes albopictus were released and allowed to acclimatize for 1 hour. Thereafter, the tester (corresponding to the tester 14 in FIG. 1) entered the room, and was allowed to stand in the center of the room. The entrance of the room was opened 10 cm to form an opening (corresponding to the opening 15 in FIG. 1). The obtained specimen was hung at a position 180 cm from the floor of the opening. Using the tester as an attracting source, the number of Aedes albopictus entering the room was counted every 10 minutes from the start of the test to 30 minutes later. The number of heads that invaded in 30 minutes was defined as the total number of intrusions in the treatment area.

<No treatment zone>
The number of Aedes albopictus that invaded the living room was counted in the same procedure as in the treatment section except that no sample was used. The number of heads that invaded in 30 minutes was defined as the total number of intrusions in the untreated section. The invasion inhibition rate was determined using the above formula (II). The same test was performed twice, and the average of the invasion inhibition rate was obtained. The results are shown in Table 8.

(Example 14)
A test was carried out in the same manner as in Example 13 except that the amount of metfurthrin used was changed to 200 mg and the amount of liquid paraffin used was changed to 400 mg, and the invasion inhibition rate of Aedes albopictus was obtained. The same test was performed twice, and the average of the invasion inhibition rate was obtained. The results are shown in Table 8.

(Comparative Example 2)
A test was carried out in the same procedure as in Example 13 except that the amount of metfurthrin used was changed to 50 mg and the amount of liquid paraffin used was changed to 100 mg, and the invasion inhibition rate of Aedes albopictus was obtained. The same test was performed twice, and the average of the invasion inhibition rate was obtained. The results are shown in Table 8.

  As shown in Table 8, when the amount of metfurthrin used was 100 mg and 200 mg, it was 80% or more. Therefore, it can be seen that if the carrier is impregnated with at least 100 mg of metfurthrin, an excellent invasion inhibiting effect is exhibited.

1 Test area 11 Living space 12 Outside living space 13 Sample 14 Tester (attraction source)
15 Opening 2 Test room 21 Living room 22 Opening 23 Sample 24 Dry ice (attraction source)
3 Test room 31 Sample 32 Test cage 4, 4 'Test equipment 41 Box (plastic box)
42 Intake hole 43 Exhaust hole 44 Small fan 45 Sample 46 Collection hole 5 Test chamber 51 Living room 52 Door 53 Sample 54 Dry ice (attraction source)

Claims (7)

A carrier, and a room temperature volatile pyrethroid compound held on the carrier,
A pest control material characterized in that at least an amount of a room temperature volatile pyrethroid compound represented by the following formula (I) is held on a carrier.
Retention amount (mg) = 100 mg + A × B (I)
A: Maximum volatilization amount per day of a room temperature volatile pyrethroid compound (mg / day)
B: Use period (days) The pest control material according to claim 1, wherein the room temperature volatile pyrethroid compound is held on a carrier at a concentration of at least 2 mg / cm ² . The pest control material according to claim 1 or 2, wherein the room temperature volatile pyrethroid compound is held on a carrier so as to remain at a concentration of at least 1 mg / cm ² at the end of use of the pest control material.   The pest control material according to any one of claims 1 to 3, wherein the carrier is a sheet-like carrier having a network structure.   The pest control material according to any one of claims 1 to 4, which is for natural volatilization. Volatilization of the room temperature volatile pyrethroid compound from the carrier holding at least the amount of the room temperature volatile pyrethroid compound represented by the following formula (I) to an air concentration of at least 0.05 μg / m ³ A method for controlling pests, characterized in that
Retention amount (mg) = 100 mg + A × B (I)
A: Maximum volatilization amount per day of a room temperature volatile pyrethroid compound (mg / day)
B: Use period (days)   The pest control method according to claim 6, wherein the room temperature volatile pyrethroid compound is volatilized naturally.

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