JP2022100224A - Arthropod trap and arthropod capturing method - Google Patents

Abstract

To provide a trap capable of efficiently capturing arthropods, which live in areas such as a water surface of a paddy field etc. and aquatic and bog plants, so as to classify or count them, and a capturing method.SOLUTION: An arthropod trap includes a body that comprises a bottom, a roof part and a side and that has a hollow structure. The body has at least one opening provided in the side part. A top surface of the bottom is provided with an adhesive region that is coated with a pressure-sensitive adhesive. An undersurface of the bottom is provided with a float material. The arthropod trap is used for an arthropod capturing method.SELECTED DRAWING: Figure 1

Description

The present invention relates to a catcher for catching arthropods such as spiders whose habitat is on the surface of the water, and a method for catching arthropods such as spiders whose habitat is the surface of the water.

Arthropods such as spiders and insects that live in paddy fields, especially wolf spiders, are known as natural enemies that prey on planthoppers and leafhoppers, which are pest insects of paddy rice. Wolf spiders are expected to be utilized in the control of paddy rice pests because of their high population density in paddy fields and high predation efficiency. In order to effectively use such natural enemies for pest control, it is important to understand the outbreak situation in paddy fields. Conventionally, in order to grasp the occurrence of natural enemies, a method of directly visually observing and counting the rice in the paddy field and the natural enemies in the vicinity thereof has been adopted. However, this method had to instantly determine the type of natural enemy, which was difficult to implement unless an experienced investigator. In addition, due to the influence of the behavioral characteristics of natural enemies, the visual and counting results may fluctuate greatly depending on the weather and time zone, making it difficult to conduct a highly accurate survey. There is also a method of sucking and capturing natural enemies with an engine blower, but the suction work and the sample separation work after suction are complicated, and the spider escapes due to the approach of the investigator and the sound of the engine blower. There was a problem that it could not be captured efficiently.

Another method of investigating the outbreak of crop pests is to install traps. This method is a method of observing captured pests and the like after installing the trap at a predetermined position for a predetermined time. For example, by setting a predetermined time to several hours to several days, it is possible to make the type and number of captured objects less susceptible to the time zone and the weather. In addition, since the objects remaining in the trap are classified and counted, it can be easily carried out even by a non-skilled investigator. As a search method using such a trap, Non-Patent Document 1 discloses a method of floating a styrofoam mass coated with an adhesive substance on the water surface of a paddy field and counting and observing the captured spiders. .. Further, Non-Patent Document 2 discloses a method of floating a pitfall trap on the water surface of a pond and capturing inhabiting spiders.

M. J. Oraze, et al., J. Arachnol., Vol.16: 331-337 (1988) A. K. Graham, et al., J. Arachnol., Vol.31: 78-89 (2003)

The trap used by the method shown in Non-Patent Document 1 has an exposed adhesive surface, but wandering spiders, which are natural enemies of paddy rice pests, move in search of a place to hide from predators such as birds. Due to its behavioral characteristics, it is difficult to capture efficiently on exposed adhesive surfaces. Further, the method shown in Non-Patent Document 2 is suitable for installing a pond or the like having a certain water depth because the captured portion is in the shape of a cup, but cannot be installed in a paddy field with a shallow water depth.

An object of the present invention is to solve the above-mentioned conventional problems, and to classify and count arthropods whose habitats are water surface such as paddy fields and aquatic / wet plants, it is possible to efficiently capture them. The purpose is to provide various catchers and catching methods.

In order to solve the above problems, the present inventor has conducted extensive research, and as a result, by using an adhesive trap that has a bottom coated with an adhesive and a roof covering the bottom and can float on the water surface, the inside of the paddy field It was found that the arthropods that inhabit the area can be efficiently captured. The present invention is based on the novel findings, and specifically provides the following inventions.
(1) A body having a hollow structure having a bottom, a roof and sides, the body having at least one opening on the side and an adhesive region on the top surface of the bottom. An arthropod catcher with a float on the underside of the bottom.
(2) The trap according to (1), wherein the height of the side portion is 0.5 to 10 cm.
(3) The catcher of (1) or (2) having at least two openings on the sides facing each other with the center of the main body interposed therebetween.
(4) The trap according to any one of (1) to (3), wherein at least one opening on the side extends to the lower end of the side.
(5) The trap according to any one of (1) to (4), further comprising a fixing string having one end attached to a main body or a floating material.
(6) The trap of (5) having a fixing member at the other end of the fixing string.
(7) A method for capturing arthropods, wherein the trap according to any one of (1) to (6) is suspended at a predetermined position on the water surface and collected after a predetermined period of time.
(8) The trap according to any one of (1) to (6) is suspended at a predetermined position on the water surface, collected after a predetermined period of time, and the arthropods present in the adhesive region are classified and counted. How to investigate arthropods.

According to the present invention, it is possible to provide a catcher and a catching method capable of efficiently catching arthropods in which arthropods live on the surface of water such as paddy fields and aquatic / wet plants. Will be.

It is a perspective view which shows the appearance of one Embodiment of the arthropod catcher of this invention. FIG. 1 is a cross-sectional view taken along the line AA'in FIG. FIG. 1 is a cross-sectional view taken along the line BB'in FIG. It is a photograph which shows the appearance of another embodiment of the arthropod catcher of this invention. The state where the arthropod catcher is actually installed in the paddy field is shown. FIG. 3 shows a photograph of the sticky area of the arthropod catcher after capturing the arthropods in a paddy field in another embodiment of the arthropod catcher of the present invention. It is a line graph which shows the transition of the number of the wolf spider observed by the investigation method of the arthropod of this invention, and the conventional investigation method. The tendency of the occurrence and fate of wolf spiders was almost the same in the two methods, but the number of observations was clearly higher in the investigation method of the present invention. It is a line graph which shows the transition of the number of catches of various natural enemies of paddy rice pests observed by using the investigation method of the arthropod of this invention. There are many water striders in the early summer until the paddy rice grows, and there are many wolf spiders in July to September when the paddy rice grows sufficiently. It is a graph which shows the number of the wolf spider caught using the arthropod catcher of the present invention and the arthropod catcher of the present invention with the roof removed, respectively. In the arthropod catcher of the present invention, about three times as many wolf spiders were observed as the catcher with the roof removed. It is a graph which shows the distribution of the preservation state of the wolf spider among the wolf spiders captured by using the arthropod catcher of the present invention and the arthropod catcher of the present invention with the roof removed, respectively. Individuals in which only the pedipals of the wolf spider were observed are classified as group i, individuals in which some of the individuals are observed are classified as group ii, and individuals in which complete individuals are observed are classified as group iii. The ratio of the number of individuals in each group to the number of individuals was calculated. It is a graph which shows the number of the wolf spider caught using a plurality of arthropod catchers having different heights from the bottom to the roof. The numerical value in the figure is the average value of the number of wolf spiders caught by two traps in each treatment group. Among the traps examined, the taller the roof, the more wolf spiders could be caught.

<1. Arthropod trap>
The arthropod catcher of the present invention comprises a body having a hollow structure, including a bottom, a roof and sides, wherein the body has at least one opening on the side and an adhesive on the top surface of the bottom. It is characterized by having an adhesive region coated with a floating material on the lower surface of the bottom.

As used herein, the term "arthropod" refers to an animal belonging to the phylum Arthropod, and includes insects, crustaceans, spiders, centipedes and the like. The arthropods targeted by the arthropod catcher of the present invention are arthropods whose habitat is on the surface of water such as paddy fields and aquatic / wet plants, and are particularly insects and spiders. Furthermore, it is an insect belonging to the aquatic hemiptera including the family Hemiptera, the family Hemiptera, and the family Beetle, which can be natural enemies of paddy rice pests. be.

In order to accurately investigate the habitat of natural enemies of paddy pests in paddy fields, it is necessary to observe more natural enemies. The arthropod catcher of the present invention enables the observation of many natural enemies by efficiently capturing the above-mentioned arthropods, and makes it possible to investigate the habitat of the natural enemies with higher accuracy. be.

In the present specification, the vertical direction of the arthropod catcher (hereinafter, also simply referred to as “capturer”) is the vertical direction perpendicular to the water surface when the catcher is suspended on the water surface. As used herein, "height" refers to the length in the vertical direction with respect to the water surface. The "bottom" of the trap body of the present invention refers to a substantially horizontal portion constituting the bottom of the trap body, and the "roof" is the most of the trap body existing with a gap above the bottom. It refers to the part that constitutes the upper part and covers all or part of the upper part of the bottom, and the "side part" refers to the side part sandwiched between the outer edge of the bottom and the outer edge of the roof.

An embodiment of the trap of the present invention is shown in FIGS. Hereinafter, the catcher of the present invention will be described based on the embodiments of FIGS. 1 to 3, but the catcher of the present invention is not intended to be limited to the embodiment. 1 is an external perspective view of an embodiment of the trap of the present invention, FIG. 2 is a sectional view taken along the line AA'in FIG. 1, and FIG. 3 is a sectional view taken along the line BB'in FIG.

The main body 11 of the trap 10 of the present invention has a hollow structure formed of members constituting the bottom portion 12, the roof portion 13, and the side portions 14. The bottom portion 12, the roof portion 13, and the side portion 14 are preferably composed of a thin plate-shaped member. Examples of the material forming such a thin plate-shaped member include paper, plastic, rubber, metal, and wood. Since it is desired to separate only the member of the adhesive region from other members for the classification and counting of the captured arthropods, a material that can be easily separated with scissors or the like is particularly preferable. Further, a water resistant material is preferable because it floats on the water surface for a predetermined period. Such materials include paper coated with waterproof paint (particularly cardboard, etc.), synthetic paper (YUPO (registered trademark) paper, etc.), and plastic (particularly polypropylene, polyethylene, polyethylene terephthalate, polyvinyl chloride, etc.). , Alternative plastics (LIMEX®, etc.) can be preferably used. It is desirable that the thin plate-shaped member is opaque, particularly low in light transmission, so that the inside cannot be visually recognized from at least above the trap.

The bottom portion 12, the roof portion 13, and the side portion 14 are not particularly limited, but may be formed by folding and assembling one thin plate-shaped member, or may be formed as a plurality of different thin plate-shaped members and connected to each other. May be done. The bottom 12, roof 13 and side 14 are preferably assembled as one member.

The height of the side portion 14 of the main body 11 is preferably 0.5 to 10 cm, particularly 2.0 to 6.0 cm, and more preferably 2.0 to 5.0 cm. Since wolf spiders prefer narrow and dark places, providing a roof has the advantage that they can easily enter the adhesive area inside, but on the other hand, if the height of the side part is too low, wolf spiders etc. There may be problems that it is difficult for the spider to enter and that the roof portion easily adheres to the adhesive area. On the other hand, if the height of the side portion is made too high, there may be a problem that light easily enters through the opening and a fall is likely to occur due to a crosswind or the like. By setting the side portion to the above height, it is difficult for the side portion to fall and the like, and more efficient capture becomes possible.

The side portion 14 is provided with at least one opening 16 that serves as an entrance for arthropods. Preferably, the side portion 14 is provided with at least two openings 16 so as to face each other with the center of the main body 11 interposed therebetween. The opening 16 preferably extends to the lower end of the side portion 14 to allow more arthropods to enter. The shape and size of the opening 16 are not particularly limited, but the main body 11, the side portion 14, and the opening 16 have the main body formed in a square cylinder shape with both ends open as shown in the illustrated example, and the open portion is on the side. It can be easily formed by forming a part. Although more openings 16 may be formed, the total area of the openings 16 is the total area of the side portions 14 in order to reduce water wetting of the adhesive region S or to keep the inside of the main body dark. It is preferably 70% or less, particularly less than 50%.

The adhesive region S in the trap 10 refers to an region provided with an adhesive layer 15 coated with an adhesive, which is formed on all or a part of the upper surface of the bottom portion 12 of the main body 11. As shown in the illustrated example, the adhesive may be directly applied to the member constituting the bottom portion 12 to form the adhesive. For example, the adhesive may be applied to a thin plate-shaped member different from the bottom portion 12, and the adhesive may be applied. It may be fixed to the upper surface of the bottom portion 12 so as to be the upper surface. The adhesive region S is preferably arranged at least near the opening 16 on the side portion, and more preferably arranged on the entire upper surface of the bottom portion 12. In the adhesive region S, the adhesive may be applied so as to form a uniform layer over the entire region as shown in the illustrated example, but may be applied as a pattern such as dots, stripes, and wavy stripes (not shown). ..

The "adhesive" applied to the adhesive region S refers to a non-drying substance that has adhesiveness at room temperature and does not have fluidity or water solubility at room temperature. The pressure-sensitive adhesive is not particularly limited as long as it is a substance satisfying the above conditions, and is, for example, natural rubber, synthetic rubber, ethylene-vinyl acetate copolymer, polyisobutylene, polybutene, atactic polypropylene and other liquid polymers, and petroleum. Examples thereof include adhesive-imparting resins such as resins. These substances can be used alone by heating in the presence of a solvent without a solvent, or by mixing and applying them in a latex or emulsion state. In particular, the combination of a styrene-butadiene block polymer and / or an ethylene-vinyl acetate copolymer with a tackifier resin and a plasticizer, and the combination of polyisobutylene with liquid polybutene and atactic polypropylene have good adhesive properties and are solvent-free. It can be heated and mixed with, and can be applied as it is, so it has good workability and can be used suitably. The viscosity of the pressure-sensitive adhesive applied to the trap of the present invention (JIS K-6833 (1980)) is preferably 2500 to 3300P at 130 ° C.

The shape of the main body 11 may be any shape such as trapezoidal shape, inverted trapezoidal shape, triangular shape, polygonal shape, semicircular shape, square shape, etc., as long as the lower surface of the bottom is substantially horizontal. The shape of the bottom surface of the main body is not particularly limited, but is preferably rectangular in consideration of ease of assembly and the like. Further, the size of the main body 11 is not particularly limited, but since it is installed in a paddy field where rice is planted, it is preferable that the size of the bottom surface is about 5 to 30 cm, particularly about 7 to 20 cm.

A floating material 17 is attached to the lower surface of the bottom portion 12 of the main body 11. The number, shape, and size of the floating material 17 are not particularly limited as long as the trap 10 can be floated while keeping the bottom 12 of the main body 11 horizontal. If the bottom 12 is tilted, there is a risk that the adhesive will flow. In particular, as shown in the illustrated example, the bottom portion 12 can be maintained horizontally by mounting the float 17 in a flat plate shape so as to cover the entire lower surface of the bottom portion 12. As the structure of the floating material 17, any structure used as a normal floating material, such as a closed hollow structure or a porous structure, can be adopted. The material of the floating material 17 is not particularly limited as long as it can impart water resistance, buoyancy, and rigidity to the extent that the shape can be maintained on the water surface, but it is particularly preferable to use a material that is easy to process. Examples of such a material include Styrofoam, EVA, polyethylene foam, and polyurethane foam. When the floating material 17 has a flat plate shape, the size of the bottom surface of the floating material 17 is preferably the same as the bottom surface of the main body 11. The buoyancy of the floating material 17 and the weight of the main body 11 are preferably adjusted so that the upper surface of the bottom 12 of the main body 11 is at a position of about 0.1 to 3 mm from the water surface when installed on the water surface.

The floating material does not necessarily have to be composed of a main body 11 and a separate member as shown in the illustrated example. For example, by using a thin plate-shaped member constituting the bottom portion 12 of the main body 11 as a material having a desired buoyancy and rigidity, the bottom portion 12 may have a function of a floating material (not shown).

Since the capture of natural enemies is continuously performed at a predetermined position, it is necessary to prevent the main body 11 from flowing and moving from the predetermined position. Therefore, it is preferable to attach a fixing string 18 for fixing the main body 11 to a pile or the like. In the illustrated example, one end of the fixing string 18 is attached to an arbitrary position of the main body 11, and the other end is fixed to a stake or the like. The fixing string 18 may be attached to the floating material 17. The length of the fixing string 18 is not particularly limited, but is preferably about 10 to 50 cm. The material of the fixing string 18 is not particularly limited as long as it has water resistance, but a PP string or the like that is easy to process and is lightweight can be preferably used.

The other end of the fixing string 18 may be directly tied to the stake or the like, but is preferably fixed to the stake or the like via the fixing member 19. The fixing member 19 is not particularly limited as long as the fixing string 18 can be fixed to a stake or the like, and a clip, a clothespin, an O-ring, an S-shaped hook, or the like can be used. O-rings, especially openable and closable O-rings (generally also referred to as "card rings"), can reduce the risk of the fixing string 18 being wrapped around a stake or the like and the trap being tilted due to an increase or decrease in the water level of the paddy field. Can be preferably used.

FIG. 4 shows a state in which another embodiment of the trap of the present invention is actually installed in a paddy field. In the trap 40 of the embodiment shown in FIG. 4, the main body 41 is formed in a substantially square cylinder shape with both ends open, the bottom portion 42 having a flat trapezoidal cross section larger than the roof portion 43. The side portion 44 has an opening 46b in addition to the opening 46a formed in the open portion. Also in this embodiment, the adhesive region S is provided on the upper surface of the bottom portion 42, and the floating material 47 is provided on the lower surface of the bottom portion 42. Further, the fixing string 48 and the fixing member 49 may be provided. In the illustrated example, the fixing member 49 is attached so as to surround the support column P installed in the paddy field. Other aspects are the same as those of the embodiments shown in FIGS. 1 to 3.

The trap of the present invention may be limited to the above embodiment as long as the upper surface of the bottom having the adhesive region of the main body floats on the water surface in a substantially horizontal state and has a roof portion covering the bottom surface. is not.

<2. How to capture arthropods>
The method for capturing arthropods of the present invention (hereinafter, also simply referred to as “capture method”) is described in <1. The arthropod catcher> is characterized in that the catcher described in the above is floated at a predetermined position on the water surface and collected after a predetermined period of time. Unless otherwise specified, detailed conditions and the like in the capture method of the present invention are described in <1. Same as arthropod catcher>.

In the capture method of the present invention, the "predetermined position" means that the trap is within a certain distance from one point determined on the surface of the water. More specifically, it means that the trap is located within 10 to 50 cm, more preferably within 20 to 40 cm from one point.

Further, the "predetermined period" is a period set in advance for installing the catcher in a predetermined position, and specifically refers to 3 to 10 days, more preferably 5 to 7 days.

More specifically, the capture method of the present invention comprises the following steps.
(1) Step to prepare the catcher (2) Step to install the catcher in a predetermined position on the water surface (3) Step to collect the catcher

(1) Step to prepare a catcher <1. This is the step to prepare the catcher described in Arthropod Catcher>. In preparing and preparing the catcher, a commercially available pest catcher may be used for the main body part.

(2) Step of installing the catcher at a predetermined position on the water surface The catcher is suspended at a predetermined position on the water surface. The place of installation is not limited as long as the water surface exists, and examples thereof include paddy fields, waterways, rush fields, lotus root fields, ponds, and pools. Paddy fields are preferred. The means for suspending the catcher in a "predetermined position" is not particularly limited, but for example, one end of the fixing string is attached to the catcher body, and the other end of the fixing string is fixed to a stake or the like installed on the ground of a paddy field. You can take steps to do so. The suspended trap is left untouched for a predetermined period, preferably 3 to 10 days, but it may sink due to the influence of wind and rain, or the string may break and come off the predetermined position. It is preferable to check for it regularly.

(3) Step to collect the catcher After a predetermined period of time, the installed catcher is collected. At that time, it is preferable to confirm whether the target arthropod or other organism is surely captured in the adhesive region.

As described above, the capture method of the present invention can capture arthropods, particularly natural enemies of paddy rice pests such as wolf spiders, by a very simple method.

<3. How to investigate arthropods>
The method for investigating arthropods of the present invention (hereinafter, also simply referred to as “investigation method”) is described in <1. The arthropod catcher> is characterized in that the catcher described in> is suspended at a predetermined position on the water surface, collected after a predetermined period of time, and the arthropods existing in the adhesive region are classified and counted. Unless otherwise specified, detailed conditions and the like in the investigation method of the present invention are described in <1. Arthropod trap> and <2. How to capture arthropods> is the same.

More specifically, the investigation method of the present invention comprises the following steps.
(1) Steps to prepare the catcher (2) Step to place the catcher in place on the surface of the water (3) Step to collect the catcher (4) Classification of arthropods present in the sticky area of the catcher The steps (1) to (3) are <2. How to capture arthropods> is the same.

(4) Steps to classify and count arthropods existing in the sticky area of the catcher By opening the roof of the collected catcher and exposing the sticky area, it is possible to observe the captured arthropods. can. In particular, when the trap body is made of paper or plastic, the roof can be easily opened with scissors or the like. Furthermore, by separating only the bottom part from other members with scissors or the like, it becomes easier to store, observe, and photograph.

Classification and counting of captured arthropods may be performed visually, but can also be performed, for example, by image analysis using a computer. For example, it is possible to input the image data of the photograph of the obtained adhesive region and collate it with the image database of each arthropod preset on the computer to output the name of the nearest arthropod. This collation may be performed using artificial intelligence (AI). When AI is used, AI can be constructed by using the above image database as teacher data through machine learning using a known neural network, and using this, the corresponding section can be constructed from the newly input image data. You can identify foot animals.

FIG. 5 shows a photograph of the adhesive region of the catcher after catching an arthropod in a paddy field with the catcher of the present invention. As shown in FIG. 5, since the captured arthropods are fixed, their classification and counting can be easily performed. In addition, it is easy to store the sample. In the illustrated example, 16 wolf spiders and 4 water striders can be confirmed.

The type and number of arthropods that inhabit the paddy field, for example, by capturing and observing multiple times at the same position in the paddy field, etc., with the same conditions for both the catcher used and the period of floating on the water surface. It is possible to investigate the transition of the seasons. Alternatively, by capturing and observing at multiple locations at the same time, it is possible to investigate the regional differences in the types and numbers of arthropods that inhabit paddy fields and the like. In each case, compared with the conventional method, it is possible to carry out a simple and reliable survey without being affected by the skill level of the surveyor.

<Example 1 Comparison with the conventional method (drawing method)>
In the same paddy field, the number of wolf spiders confirmed by the survey method using the trap of the present invention (trap method) and the conventional survey method by visual observation (spot method) was compared.

(1) Trap method A trap used for the trap method was created. A 2 mm thick foamed styrene board was cut into 181 × 86 mm and attached to the bottom surface of a commercially available cockroach trap (trade name: research PP trap J (L), manufactured by Environmental Equipment Co., Ltd.) using a stapler. The size of the cockroach trap was 187 mm × 88 mm in the size of the bottom surface and 28 mm in the height of the side surface. One end of a 350 mm PP string was attached to the bottom of the cockroach trap using a stapler. A plastic O-ring (card ring) with a diameter of 30 mm was attached to the other end of the PP string to complete the trap.

The completed trap was floated on the surface of the paddy field. A strut with a thickness of 11 mm and a length of 1800 mm was deeply inserted into a predetermined position in the paddy field, and the trap was attached by passing the ring at the end of the trap through the strut. The catcher was replaced weekly. The investigation continued for 13 weeks at the same location.

Regarding arthropods captured by the trap method, natural enemies other than wolf spiders were also classified and measured, and changes in the number of captured natural enemies in the tested paddy fields were observed.

(2) Sketch method At the same time when the above trap method was carried out, the wolf spiders inhabiting any paddy field in the same paddy field were visually counted. Counting was done once a week.

(3) Results Figure 6 shows the number of wolf spiders observed by the trap method and the sketch method. The tendency of wolf spider outbreaks and fate was almost the same in the two methods. On the other hand, the number of observations was clearly higher in the trap method. Observations by the trap method show the same tendency as the conventional method, and it is shown that more accurate investigation is possible.

FIG. 7 shows changes in the number of captured natural enemies observed using the trap method. Water striders increased in early summer until paddy rice grew, and wolf spiders increased in July-September when paddy rice grew sufficiently. This is similar to the trends previously observed with conventional methods.

<Example 2 Trap roof effect confirmation test I>
A catcher was prepared in the same manner as in Example 1. As a comparative example, a roofless trap with exposed adhesive areas was created by separating the roof and sides from the trap. The covered and uncovered traps were similarly suspended in the same paddy field. After one week, both traps were collected and the numbers of wolf spiders caught were compared.

FIG. 8 shows the number of wolf spiders caught in the covered catcher and the uncovered catcher. In the covered catcher, about three times as many wolf spiders were observed as in the uncovered catcher.

<Example 3 Trap roof effect confirmation test II>
A covered catcher and an uncovered catcher were created in the same manner as in Example 2. The covered and uncovered traps were similarly suspended in the same paddy field. One week later, both traps were collected and the number of captured wolf spiders and the condition of each individual were observed.

The wolf spiders captured by the covered and uncovered traps were classified according to the condition of the observed individuals. Group i is the number of individuals in which only the tactile limbs of the komori spider are observed, group ii is the number of individuals in which some of the individuals are observed, and group ii is the number of individuals in which complete individuals are observed. The ratio of each group to the total number of individuals was calculated.

FIG. 9 shows the proportion of each group of wolf spiders caught by the covered and uncovered traps. Obviously many complete individuals were observed in the covered traps. It was clarified that it is possible to obtain a sample in good condition by using a trap with a roof.

<Example 4 Examination of the height of the trap roof>
Fold a 0.2 mm thick plastic paper (manufactured by Tamiya Corporation) to create a square tubular member with a length of 187 mm, a width of 88 mm, a height of 1.5 cm, and openings at both ends in the longitudinal direction (vertical direction). did. Similarly, square cylindrical members having a height of 3.0 cm, 4.0 cm and 6.0 cm were prepared. The entire bottom portion of the cockroach trap used in Example 1 having the adhesive region is cut out together with the mount, and the adhesive region is placed on the surface corresponding to the upper surface of the bottom of the plastic paper before assembling the square tubular member so that the adhesive region is on the upper surface side. Attached with a stapler. After that, the plastic paper was folded and fixed with a clip so that the whole became a square tube. A 2 mm thick foamed styrene board was cut into 181 × 86 mm and attached to the bottom surface of the square tubular member using a stapler. One end of a 350 mm PP string was attached to the bottom using a stapler. A plastic O-ring with a diameter of 30 mm was attached to the other end of the PP string to complete various traps. Two traps with heights of 1.5 cm, 3.0 cm, 4.0 cm and 6.0 cm were prepared.

Each completed catcher was floated on the surface of the paddy field. A strut with a thickness of 11 mm and a length of 1800 mm was deeply inserted into a predetermined position in the paddy field, and the trap was attached by passing the ring at the end of the trap through the strut. For one week (August 12th to 19th) at the same time, two traps for each height condition were installed and floated. After floating for one week, each trap was collected and the number of wolf spiders adhering to the sticky area was counted.

FIG. 10 shows the number of wolf spiders caught by the traps under each height condition. The numbers in the figure show the average number of wolf spiders captured by the two traps. Among the height conditions examined, the higher the roof height, the more wolf spiders could be caught. It was confirmed that the height of the roof needs to be higher than a certain level in order to catch the wolf spider more reliably.

The trap, capture method and investigation method of the present invention are useful for utilizing natural enemies as a countermeasure against paddy rice pests in rice farming, and can be used in industrial fields such as agriculture. It can also be used as a teaching material for environmental education in paddy field creature surveys.

10, 40 ... Trapper 11, 41 ... Main body 12, 42 ... Bottom 13, 43 ... Roof 14, 44 ... Side 15 ... Adhesive layer 16, 46 ... Opening 17, 47 ... Floating material 18, 48 ... Fixed string 19, 49 ... Fixing member S ... Adhesive area P ... Support

Claims (8)

With a body with a hollow structure, with a bottom, roof and sides,
The body has at least one opening on the side and
On the top surface of the bottom, there is an adhesive area coated with adhesive,
A float is provided on the lower surface of the bottom,
Arthropod catcher. The trap according to claim 1, wherein the height of the side portion is 0.5 to 10 cm. The catcher according to claim 1 or 2, having at least two openings on the sides facing each other across the center of the body. The catcher according to any one of claims 1 to 3, wherein at least one opening on the side extends to the lower end of the side. The catcher according to any one of claims 1 to 4, further comprising a fixing string whose one end is attached to a main body or a floating material. The catcher according to claim 5, further comprising a fixing member at the other end of the fixing string. A method for capturing an arthropod, wherein the catcher according to any one of claims 1 to 6 is suspended at a predetermined position on the surface of the water and collected after a predetermined period of time has elapsed. The catcher according to any one of claims 1 to 6 is suspended at a predetermined position on the water surface, collected after a predetermined period of time, and the arthropods existing in the adhesive region are classified and counted. , How to investigate arthropods.

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