JP2020010664A - Insect pest extermination device - Google Patents

Abstract

To provide an insect pest extermination device capable of producing a sufficient insecticidal effect, in which a liquid bait agent hardly volatilizes so that the insecticidal effect can last long.SOLUTION: An insect pest extermination device 1 includes an impregnation body 10 impregnated with a liquid bait agent and a container 20 for holding the impregnation body 10, and is formed with an exposed part 12, in which at least part of the top face of the impregnation body 10 is exposed in the air. The insect pest extermination device causes insect pests to eat the liquid bait agent impregnated in the impregnation body 10, in which, when a periphery length (mm) of an eaten region 30 surrounding the exposed part 12 in a plane view is represented by L, and an area (mm) of the exposed part 12 is represented by S, S/L is 1.1-5.0.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pest control device.

  A pest control device that eats a liquid bait (medicine solution) by a pest to exterminate it includes an impregnated body impregnated with a liquid bait, and a container that houses the impregnated body, and exposes a part of the impregnated body. Devices are known. For example, for cockroaches, a device has been proposed in which a liquid bait is eaten by a cockroach while a part of an impregnated sheet impregnated with the liquid bait is exposed or a liquid absorbing core sucking up a small amount of the liquid bait. (Patent Documents 1 and 2).

JP 2015-33374 A JP 2012-157322 A

  However, with the pest control devices disclosed in Patent Documents 1 and 2, it may be difficult to obtain a sufficient insecticidal effect. Further, it is considered that the more exposed parts of the impregnated body, the higher the probability that the pests will recognize the exposed parts, but in the case of an aqueous liquid bait, the liquid bait is volatilized over time, so that it can be used continuously for a long time. Is difficult. In particular, since the liquid bait for cockroaches contains a large amount of water, volatilization with time is remarkable.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a pest control device which can provide a sufficient insecticidal effect and which is less likely to evaporate a liquid bait and has a longer insecticidal effect.

The present invention has the following configuration.
[1] A pest control apparatus comprising: an impregnated body impregnated with a liquid bait; and a container accommodating the impregnated body, wherein the insect pest is eroded by the liquid bait impregnated in the impregnated body.
At least one exposed portion in which at least a part of the upper surface of the impregnated body is exposed to the air is formed,
Assuming that the perimeter (mm) of the eating area surrounding the exposed portion in plan view is L and the area (mm ² ) of the exposed portion is S, the pest control device has an S / L of 1.1 to 5.0. .
[2] The pest control device according to [1], wherein the S is 15 to 500 mm ² .
[3] The pest control device according to [1] or [2], wherein the liquid bait has a water content of 30% by mass or more.
[4] The pest control device according to any one of [1] to [3], wherein the shape of the exposed portion in plan view is annular.

  INDUSTRIAL APPLICABILITY The pest control apparatus of the present invention has a sufficient insecticidal effect, and the liquid bait is less likely to volatilize and the insecticidal effect is likely to last longer.

It is the perspective view which showed an example of the pest control device of this invention. It is a top view of the pest control device of FIG. It is a longitudinal cross-sectional view of the pest control device of FIG. It is a top view showing an example of the pest control device of the present invention. It is a top view showing an example of the pest control device of the present invention. It is a top view showing an example of the pest control device of the present invention.

The pest control device of the present invention is a pest control device that includes an impregnated body impregnated with a liquid bait, and a container that stores the impregnated body, and in which the pest is eaten by the liquid bait impregnated in the impregnated body. In the pest control device of the present invention, one or more exposed portions in which at least a part of the upper surface of the impregnated body is exposed to the air are formed. Further, when the peripheral length (mm) of the eating area surrounding the exposed part in plan view is L and the area (mm ² ) of the exposed part is S, S / L is 1.1 to 5.0.

  In the present invention, the eating area surrounding the exposed portion of the impregnated body of the pest control device is, in plan view, only the outer edge of the exposed portion, or passes through the corner between the outer edge of the exposed portion and the outer edge of the exposed portion, or the outer edge of the exposed portion. Is set so that there is no concave portion that is depressed inward by a straight line that is in contact with. In the case where there are a plurality of exposed portions, in a plan view, a region without a concave portion surrounding the outermost exposed portion is set as a eating region by a straight line passing through the corner of the outer edge of the exposed portion or contacting the outer edge of the exposed portion. . When there is an exposed portion having a recess in the outer edge shape in a plan view, the end portion of the recess passes through the corner of the outer edge of the exposed portion or draws a straight line in contact with the outer edge of the exposed portion to eat the region including the recess. Area.

  Hereinafter, an example of the pest control device of the present invention will be described with reference to the drawings. It should be noted that the dimensions and the like in the drawings illustrated in the following description are merely examples, and the present invention is not necessarily limited thereto, and can be implemented by appropriately changing the scope without changing the gist thereof. .

  As shown in FIGS. 1 to 3, the pest control device 1 includes an impregnated body 10 impregnated with a liquid bait, and a container 20 in which the impregnated body 10 is stored. The container 20 includes a container body 22 and a lid member 24. The container main body 22 includes a bottom surface portion 22a having a circular shape in plan view, and a side surface portion 22b rising from an outer peripheral end of the bottom surface portion 22a.

  In the pest control device 1, the upper opening of the container body 22 is closed by the lid member 24 in a state where the impregnated body 10 having a circular shape in plan view is accommodated in the container body 22 of the container 20. An annular hole 26 is formed in the cover member 24, and a part of the impregnating body 10 in the container 20 is exposed at the hole 26 to form the exposed portion 12. As described above, in the pest control device 1, one annular exposed portion 12 is formed.

The mode of the container 20 is not limited to the mode of this example, and can be appropriately designed.
The material forming the container 20 may be any material that does not affect the properties of the liquid bait, and examples thereof include olefins such as polypropylene and polyethylene, and polyethylene terephthalate (PET). The material forming the container 20 may be one kind or two or more kinds.
The container 20 can be manufactured by a known method.

  The impregnated body 10 of this example is an impregnated sheet having a circular shape in plan view. Note that the form of the impregnated body 10 is not limited to the impregnated sheet, and may be, for example, a column-shaped impregnated body (liquid absorbing core) that sucks up the liquid bait.

  Examples of the impregnated body 10 include those formed by heat fusion of fibers such as glass fiber, synthetic fiber (nylon, polypropylene, polyester, and the like) and natural fiber and bonding with an adhesive, and those formed from nonwoven fabric and wood. Or a matrix formed by kneading a matrix composed of one or more powders selected from inorganic and organic substances together with a resin binder, and extruding or compressing the mixture.

The eating area 30 in the pest control device 1 is a circular area formed by the outer edge of the annular exposed portion 12 in plan view.
In a plan view, the peripheral length (mm) of the eating area 30 surrounding the exposed portion 12 is L, and the area (mm ² ) of the exposed portion 12 is S. At this time, S / L is 1.1 to 5.0, preferably 1.2 to 4.0, and more preferably 1.2 to 2.5. When S / L is equal to or more than the lower limit of the above range, the pests can easily recognize the exposed portion 12, the eating behavior of the pests is hardly inhibited, and a high insecticidal effect is easily obtained. When S / L is equal to or less than the upper limit of the above range, the evaporation rate of water in the liquid bait becomes sufficiently slow, and the insecticidal effect is likely to be long-lasting.

In this example, assuming that the diameter of the circle inside the exposed portion 12 in plan view is r (mm) and the diameter of the outside circle is R (mm), the value of S / L is S / L = (πR ² −πr ² ) / 2πR = (R ² −r ² ) / 2R.
The method for controlling S / L is not particularly limited. For example, a method of controlling the S / L by adjusting the shape and size of the hole formed in the cover member that covers the upper surface of the impregnated body, a method of controlling the S / L by adjusting the shape of the impregnated body itself in plan view, and the like. Is mentioned.

S is preferably 15～500Mm ^2, more preferably 20～400Mm ^2, more preferably 20 to 300 mm ^2. When S is equal to or more than the lower limit of the above range, the pests can easily recognize the exposed portion 12, the eating behavior of the pests is hardly inhibited, and a high insecticidal effect is easily obtained. When S is equal to or less than the upper limit of the above range, the evaporation rate of water in the liquid bait becomes sufficiently slow, and the insecticidal effect tends to be long-lasting.

  The larger the value of L, the more widely the exposed portions are distributed in the pest control device. L is preferably from 10 to 100 mm, more preferably from 40 to 80 mm, and still more preferably from 50 to 80 mm. When L is equal to or more than the lower limit of the above range, the eating behavior of the pest is hardly inhibited, and a high insecticidal effect is easily obtained. When L is equal to or less than the upper limit of the above range, the rate of volatilization of water in the liquid bait becomes sufficiently slow, and the insecticidal effect tends to be long-lasting.

In the present invention, it is preferable that the shape of the exposed portion of the impregnated body in a plan view be annular as in this example. This makes it possible to distribute the exposed portion over a wider range while reducing the amount of the liquid bait agent volatilized from the exposed portion. Therefore, while maintaining the insecticidal effect for a long period of time, the pests can more easily recognize the exposed portion, and the insecticidal effect can be further enhanced.
When the shape of the exposed portion of the impregnated body in plan view is annular, it is not limited to an annular shape, and may be, for example, a rectangular annular shape, a triangular annular shape, or the like. Further, the shape of the exposed portion of the impregnated body in plan view may not be circular, such as circular or rectangular.

  The liquid bait is not particularly limited, and a known liquid bait can be appropriately used depending on the kind of the pest. Specific examples of the liquid bait include an aqueous solution containing an insecticidal component such as neonicotinoid-based dinotefuran, phenylpyrazole-based fipronil, amidinohydrazizone-based hydramethylnon, and boric acid.

The water content of the liquid bait is preferably 30% by mass or more, more preferably 40% by mass or more, and even more preferably 50% by mass or more. When the water content of the liquid bait is not less than the lower limit, the edibility of the liquid bait is improved, and a high insecticidal effect is easily obtained. ADVANTAGE OF THE INVENTION The pest control apparatus of this invention can fully suppress the fall of the insecticidal effect by volatilization even if the water content of a liquid bait is large.
The water content of the liquid bait is preferably 98% by mass or less, more preferably 95% by mass or less, from the viewpoint of dissolving the insecticidal component.
The water content is measured by the Karl Fischer method which is a general-purpose test method.

  An optional component can be further added to the liquid bait within a range not contrary to the object of the present invention. Optional components include a dietary component, a thickener, a bactericidal component, a surfactant, a coloring agent, a flavoring agent, a preservative, and an accidental eating preventive. These are not particularly limited, and may be those conventionally used in pharmaceuticals, quasi-drugs, cosmetics, and the like.

  The method for producing the liquid bait is not particularly limited, and is selected from known production methods. For example, a liquid bait can be obtained by adding an insecticidal component and optional components used as needed to a solvent and stirring the mixture.

  The method of using the pest control apparatus of the present invention, that is, the pest control method is not particularly limited, and examples thereof include a method of installing the pest control apparatus of the present invention at a place where the target pest is active. The number of pest control devices to be installed is not particularly limited, and may be one or two or more.

  As described above, in the pest control apparatus of the present invention, the exposed portion of the impregnated body serving as a pest feeding ground is formed such that the S / L is in a specific range. Thus, the volatilization amount of the liquid bait from the exposed portion can be reduced while increasing the recognition of the exposed portion by the pest. Therefore, the insecticidal effect can be prolonged while obtaining a sufficient insecticidal effect. Thus, the pest control device of the present invention is particularly suitable for long-term continuous use.

The pest control device of the present invention is not limited to the pest control device 1 described above.
The pest control device of the present invention may be the pest control device 2 illustrated in FIG. 4 that are the same as in FIG. 2 are given the same reference numerals and description thereof is omitted. The pest control device 2 is the same as the pest control device 1 except that an exposed portion 12A having a triangular annular shape in plan view is formed.
The eating area 30A in the pest control device 2 is a three-shaped area formed by the outer edge of the annular exposed portion 12A in plan view.

  The number of exposed portions of the impregnated body is not limited to one, and may be two or more. For example, the pest control device of the present invention may be the pest control device 3 illustrated in FIG. 5 that are the same as in FIG. 2 are given the same reference numerals and description thereof is omitted. The pest control device 3 is the same as the pest control device 1 except that four exposed portions 12B having a circular shape in plan view are formed so as to be located at respective vertexes of a rectangle.

The eating area 30B in the pest control device 3 is formed by four straight lines k that are in contact with two adjacent exposed parts 12A among the four exposed parts 12A in plan view, and outer edges of the four exposed parts 12A. This is a substantially rectangular area.
When there are a plurality of exposed portions of the impregnated body, S is the total area of each exposed portion in plan view.
The number of exposed portions of the impregnated body is preferably 1 to 10, and more preferably 1 to 5.

The pest control device of the present invention may be the pest control device 4 illustrated in FIG. 6 that are the same as in FIG. 2 are given the same reference numerals and description thereof is omitted. The pest control device 4 is the same as the pest control device 1 except that one exposed portion 12C having a substantially crescent shape in plan view is formed.
The eating area 30C in the pest control device 4 is substantially half formed by a straight line k that is in contact with the exposed portion 12C at both ends of the concave portion that is recessed toward the inside of the exposed portion 12C and the outer edge of the exposed portion 12C in plan view. It is a circular area.

The pest control device of the present invention may be, for example, a type in which a liquid bait is sucked up from a container with a columnar impregnated body (liquid absorption core). When the exposed portion is formed in a ring shape when the impregnated body is used as the liquid absorbing core, the liquid absorbing core may be formed in a cylindrical shape, and the hole formed in the lid member may be formed in a circular shape.
The pest control device of the present invention may be of a type in which a liquid bait is dropped from a container disposed on an upper portion to an impregnated sheet disposed below.

  The pest control device of the present invention may have a detachable cover sheet attached so that the hand does not directly touch the impregnated body. The cover sheet may be a single-layer member or a multi-layer member. The cover sheet may be any one that does not affect the properties of the liquid bait, and is preferably an aluminum laminated film that is a laminated film including a sealant film (an olefin film such as a polyethylene film or a polypropylene film) and an aluminum foil.

Hereinafter, the present invention will be described specifically with reference to examples, but the present invention is not limited by the following description.
[material]
The raw materials used in this example are shown below.
Fipronil: manufactured by Sumitomo Chemical Co., Ltd., trade name "Bakuda",
Dinotefuran: Made by Hayashi Junyaku Kogyo Co., Ltd., trade name "Dinotefuran",
Water candy: Nippon Cornstarch Co., Ltd., trade name "Koso Syrup H75C" (containing 25% water),
Water: ion exchange water,
DPG: manufactured by ADEKA Corporation, trade name "DPG-RF",
POE hardened castor oil: Polyoxyethylene (60) hardened castor oil, manufactured by Nikko Chemicals Co., Ltd., trade name "HCO-60",
Sesame oil: manufactured by Kaneda Co., Ltd., trade name "Sesame oil of Japanese Pharmacopoeia".

[Production Examples 1-4]
Using a stirrer (BL1200 manufactured by Shinto Kagaku Co., Ltd.), the components were sufficiently mixed with the compositions shown in Table 1 to prepare liquid baits A-1 to A-4.

[Example 1]
Pour 16 g of the liquid bait A-1 obtained in Production Example 1 into a plastic container body (height: 10 mm, internal volume: 20 mL, material: polypropylene) having a circular shape in plan view produced by sheet molding. I put it. Next, a disc-shaped sheet material (manufactured by Oji Kinocross Co., Ltd., pigeon sheet) having a thickness of 10 mm and a diameter of 40 mm was placed in the container as the impregnated body, and the impregnated body was impregnated with the liquid bait agent A-1. A circular plastic film (GL film, manufactured by Toppan Printing Co., Ltd.) was covered as a cover member so as to cover the upper opening of the container body, and was thermally welded to the upper end of the container body with an iron to obtain a pest control device. . As shown in FIG. 5, four circular holes with a diameter of 6.5 mm are formed in the lid member such that the center of the hole is at each vertex of a square having a side length of 14 mm. The impregnated body was exposed to make an exposed part.
The perimeter L of the eating area surrounding the exposed part in plan view was 76 mm, the area S of the exposed part was 133 mm ² , and the S / L was 1.74.

[Example 2]
As shown in FIG. 4, a pest control device was obtained in the same manner as in Example 1 except that the hole of the lid member was adjusted so that the exposed portion had a triangular annular shape in plan view. The outer periphery of the annular exposed portion was a regular triangle having a side length of 23 mm, and the inner periphery was a regular triangle having a side length of 15 mm.
The perimeter L of the eating area surrounding the exposed part in plan view was 69 mm, the area S of the exposed part was 132 mm ² , and the S / L was 1.91.

[Example 3]
As shown in FIG. 2, a pest control device was obtained in the same manner as in Example 1, except that the hole of the lid member was adjusted so that the shape of the exposed portion in plan view was annular. The annular exposed portion was configured so that the outer periphery was a circle having a diameter of 19 mm and the inner periphery was a circle having a diameter of 14 mm.
The perimeter L of the eating area surrounding the exposed portion in plan view was 60 mm, the area S of the exposed portion was 130 mm ² , and the S / L was 2.17.

[Example 4]
A pest control device was obtained in the same manner as in Example 1 except that the hole of the lid member was adjusted so that the shape of the exposed portion in plan view was a rectangle of 13 mm long × 10 mm wide.
The perimeter L of the eating area surrounding the exposed part in plan view was 46 mm, the area S of the exposed part was 130 mm ² , and the S / L was 2.83.

[Example 5]
A pest control device was obtained in the same manner as in Example 1, except that the hole of the lid member was adjusted so that the shape of the exposed portion in plan view was a circle having a diameter of 13 mm.
The perimeter L of the eating area surrounding the exposed part in plan view was 41 mm, the area S of the exposed part was 133 mm ² , and the S / L was 3.25.

[Example 6]
A pest control device was obtained in the same manner as in Example 1, except that the hole of the lid member was adjusted so that the shape of the exposed portion in plan view was a square with a side length of 20 mm.
The perimeter L of the eating area surrounding the exposed part in plan view was 80 mm, the area S of the exposed part was 400 mm ² , and the S / L was 5.00.

[Examples 7 to 9]
A pest control device was obtained in the same manner as in Example 1, except that the liquid bait A-1 was changed to the liquid baits A-2 to A-4.

[Comparative Example 1]
A pest control device was obtained in the same manner as in Example 1, except that the hole of the lid member was adjusted so that the shape of the exposed portion in plan view was a circle having a diameter of 30 mm.
The perimeter L of the eating area surrounding the exposed part in plan view was 94 mm, the area S of the exposed part was 707 mm ² , and the S / L was 7.50.

[Comparative Example 2]
A pest control device was obtained in the same manner as in Example 1, except that the hole of the lid member was adjusted so that the shape of the exposed portion in plan view was a circle having a diameter of 4 mm.
The perimeter L of the eating area surrounding the exposed part in plan view was 12.6 mm, the area S of the exposed part was 12.6 mm ² , and the S / L was 1.00.

[Evaluation method]
(Insecticidal effect)
A 5 cm long × 7 cm wide paper folded in a bellows shape to a size of 5 cm long × 5 cm wide was set in a test section of 0.13 m ² to form a latent area. Water and one solid feed for mice (CE-2, manufactured by CLEA Japan) were placed in the test section, and 20 German cockroaches were released and acclimated to the test section overnight (about 16 hours). After habituation, a pest control device was installed, the number of dead German cockroaches 24 hours later was counted, the mortality was determined, and the insecticidal effect was evaluated according to the following evaluation criteria.
<Evaluation criteria>
A: The mortality rate is 100%.
A: The mortality rate is 80% or more and less than 100%.
：: The fatality rate is 50% or more and less than 80%.
C: The mortality is 30% or more and less than 50%.
X: The mortality is less than 30%.

(Long lasting)
The initial mass of the insect pest control device was measured in advance, and the pest control device was allowed to stand for one month in a constant temperature room at 25 ° C. Then, the mass of the pest control device was measured again, and the mass loss was calculated. The long-lasting property (effect persistence, effect persistence) was evaluated according to the evaluation criteria.
<Evaluation criteria>
A: Mass loss is less than 3.5 g.
〇: The mass loss is 3.5 g or more and less than 7.0 g.
Δ: The mass loss is 7.0 g or more and less than 11.0 g.
X: The mass reduction is 11.0 g or more.

  Tables 2 and 3 show the conditions and evaluation results of the examples and comparative examples.

As shown in Table 2, in Examples 1 to 9 in which the S / L was within the range specified in the present invention, a high insecticidal effect was obtained, the volatilization amount of the liquid bait was small, and the battery lasted longer.
On the other hand, as shown in Table 3, in Comparative Example 1 having a large S / L, although a high insecticidal effect was obtained, the amount of the liquid bait volatilized was large, and the product did not last long. In Comparative Example 2 in which the S / L was small, the volatilization amount of the liquid bait was small, but the insecticidal effect was insufficient.

  1-4: pest control device, 10: impregnated body, 12, 12A-12C: exposed part, 20: container, 22: container body, 24: lid member, 30, 30A-30C: eating area.

Claims (4)

A pest control device comprising: an impregnated body impregnated with a liquid bait, and a container in which the impregnated body is housed, wherein the liquid bait impregnated in the impregnated body is consumed by pests,
At least one exposed portion in which at least a part of the upper surface of the impregnated body is exposed to the air is formed,
Assuming that the perimeter (mm) of the eating area surrounding the exposed portion in plan view is L and the area (mm ² ) of the exposed portion is S, the pest control device has an S / L of 1.1 to 5.0. . Wherein S is a 15~500mm ^2, pest control device according to claim 1.   The pest control apparatus according to claim 1 or 2, wherein the liquid bait has a water content of 30% by mass or more.   The pest control device according to any one of claims 1 to 3, wherein a plan view shape of the exposed portion is annular.

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