JP6933952B2 - Liquid bait for pest control and pest control equipment - Google Patents

Description

The present invention relates to a liquid bait agent for pest control and a pest control device.

As a method for exterminating pests such as cockroaches, a method of directly spraying an insecticidal component such as a pyrethroid, an organophosphorus, or a carbamate on the pest, or a method of spraying on a predetermined place is known. However, these extermination methods have a large amount of sprayed insecticidal component, and there is a concern that the user inhales the sprayed insecticidal component.

As a method of exterminating pests that do not spray the insecticidal component, a method of feeding the pests with a bait agent containing the insecticidal component has been proposed. As a bait agent, a liquid bait agent composed of an aqueous solution containing an insecticidal component is known (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2012-219043

In order to enhance the insecticidal effect of the bait agent, it is effective to enhance the eating habits. Cockroaches have a habit of returning to their nests after eating bait. Therefore, it is effective that the cockroach that has eaten the bait returns to the nest and the insecticidal effect of the bait is efficiently transmitted to other individuals by contact with each other. This enhances the insecticidal effect of the entire cockroach herd.
Therefore, an object of the present invention is a liquid bait agent for pest control and a pest control device having an excellent insecticidal effect.

As a result of repeated diligent studies, the present inventors have obtained the following findings.
By lowering the viscosity of the liquid bait agent, the eating habitability of pests can be enhanced. If the viscosity of the liquid bait agent increases after the liquid bait agent adheres to the body surface of the pest, the liquid bait agent does not easily drip and the liquid bait agent easily adheres to the other pests when in contact with the other pests. Become. As a result, the amount of the liquid bait agent that the pests bring back to the nest increases, and the insecticidal component can be transmitted to the entire group of pests by contact between the individual pests, and the insecticidal effect can be further enhanced.
That is, the present invention has the following aspects.

[1] A component (A): an insecticidal component, a component (B): a thickener, and a component (C): a solvent are contained, the viscosity at 25 ° C. is 20 mPa · s or less, and the total mass is 50. A liquid bait agent for pest control, which has a viscosity at 25 ° C. of 40 mPa · s or more and 500 mPa · s or less when it reaches mass%.
[2] The liquid bait agent for pest control according to [1], wherein the vapor pressure of the component (C) at 20 ° C. and 1013 hPa is 0.01 Pa or more and 15000 Pa or less.
[3] The component (C) contains the component (C1) and the component (C2), and the vapor pressure of the component (C1) at 20 ° C. and 1013 hPa is 1000 Pa or more and 15000 Pa or less, and 20 ° C. The pest control liquid bait agent according to [1] or [2], wherein the vapor pressure of the component (C2) at 1013 hPa is 0.01 Pa or more and less than 1000 Pa.
[4] The liquid bait agent for pest control according to [3], wherein the mass ratio represented by the component (C1) / the component (C2) is 2 or more and 10 or less.
[5] The pest control liquid bait agent according to any one of [1] to [4], wherein the component (A) is fipronil.
[6] The pest control liquid bait agent according to any one of [1] to [5], wherein the component (B) is starch syrup.
[7] The pest control according to any one of [1] to [6], which further contains benzoic acid or a salt thereof and has a pH of 3.5 or more and 6.5 or less at 25 ° C. For liquid bait agent.
[8] The pest control liquid bait agent according to any one of [1] to [7], which further contains a polyvalent carboxylic acid or a salt thereof.
[9] The pest control liquid bait according to any one of [1] to [8], wherein the content of the component (C) is 50% by mass or more with respect to the total mass of the pest control liquid bait agent. Agent.
[10] The pest control liquid bait agent according to any one of [1] to [9], which is used for cockroaches.
[11] A pest control device comprising the pest control liquid bait agent according to any one of [1] to [10] and a container containing the pest control liquid bait agent.

[12] The pest control method using the pest control liquid bait agent according to any one of the above [1] to [10].

According to the pest control liquid bait agent and the pest control device of the present invention, the insecticidal effect is more excellent.

It is sectional drawing which shows an example of the pest control apparatus of this invention. It is sectional drawing which shows the state which the seal member was peeled off from the pest control apparatus of FIG.

[Liquid bait for pest control]
The pest control liquid bait agent of the present invention (hereinafter, also simply referred to as a liquid bait agent) contains a component (A), a component (B), and a component (C).

<Ingredient (A)>
The component (A) is an insecticidal component. The component (A) may be appropriately selected according to the type of pest to be exterminated, and a known insecticidal component used in conventional bait agents can be used.

Examples of the component (A) include pyrethroid insecticidal components (phenotrin, etc.), carbamate-based insecticidal components (propoxul, etc.), oxadiazol-based insecticidal components (methoxadiazone, etc.), phenylpyrazole-based insecticidal components (fipronil, etc.), and benzoylurea. Examples thereof include amidinohydrazone-based insecticidal components (hydramethylnone, etc.), neonicotinoid-based insecticidal components (dinotefuran, thiamethoxam, acetamiprid, clothianidin, etc.), organic phosphorus-based insecticidal components (dichlorvos, etc.), boric acid, and the like.
Among them, as the component (A), a neonicotinoid-based insecticidal component, a phenylpyrazole-based insecticidal component, an amidinohydrazone-based insecticidal component, and boric acid are preferable, and a neonicotinoid-based insecticidal component and a phenylpyrazole-based insecticidal component are more preferable. In addition, phenylpyrazole-based insecticidal components are more preferable, and fipronil is particularly preferable, because there is less concern about environmental impacts. As the component (A), one type may be used alone, or two or more types may be used in combination.

The content of the component (A) can be appropriately selected according to the type of pest to be exterminated and the type of the component (A), and is 0.001% by mass or more and 30% by mass or less with respect to the total mass of the liquid bait agent. It is preferably 0.005% by mass or more and 10% by mass or less, more preferably. When the content of the component (A) is at least the above lower limit value, the insecticidal effect of the liquid bait agent is likely to be improved. When the content of the component (A) is not more than the above upper limit value, it is easy to improve the liquid stability of the liquid bait agent (the liquid tends to be uniform).

<Ingredient (B)>
The component (B) is a thickener. By containing the component (B), the liquid bait agent of the present invention has an appropriate viscosity and can enhance the insecticidal effect.

Examples of the component (B) include sugars such as starch syrup and polymer thickeners.
Examples of sugars include starch syrup, reduced starch syrup (sugar alcohol containing less than 75% by mass of reduced maltose (maltitol) and less than 50% by mass of sorbitol. Other sugar alcohols containing 2 to 4 sugars or more), sugar honey, and honey. And so on.

Examples of the polymer thickener include xanthan gum, sodium polyacrylate, carrageenan, sodium alginate, propylene glycol alginate, carboxyvinyl polymer, tragant gum, guar gum, hydroxypropyl guar gum, tara gum, locust bean gum, carrageenan, quince seed gum, and the like. Examples thereof include tamarind gum, sodium carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, cellulose, gellan gum, gelatin, carrageenan, arabic gum, agar, pectin, sodium caseinate, polyvinyl alcohol, and purulan.
The polymer thickener is preferably xanthan gum, carboxyvinyl polymer, or polyvinyl hydrin, and it is more preferable to use one or more selected from these.
As the component (B), starch syrup and reduced starch syrup are preferable, and starch syrup is more preferable, from the viewpoint of thickening the liquid bait agent and attracting pests.
As the component (B), one type may be used alone, or two or more types may be used in combination.

The content of the component (B) can be appropriately selected according to the type of pest to be exterminated and the type of the component (B). When the saccharide is used as a thickener, the content of the component (B) is preferably 5% by mass or more and less than 50% by mass, more preferably 10% by mass or more and 30% by mass or less, based on the total mass of the liquid bait agent. , 15% by mass or more and 25% by mass or less is more preferable.
When a polymer thickener is used as the thickener, the content of the component (B) is preferably 0.001% by mass or more and 5% by mass or less, preferably 0.005% by mass, based on the total mass of the liquid bait agent. 5% by mass or more is more preferable, and 0.01% by mass or more and 3% by mass or less is further preferable. When the content of the component (B) is at least the above lower limit value, a sufficient thickening effect is obtained when the total mass of the liquid bait agent becomes 50% by mass due to volatilization, and it easily adheres to pests. When the content of the component (B) is not more than the above upper limit value, the initial viscosity of the liquid bait agent can be easily reduced. Here, the initial viscosity is the viscosity immediately before using the liquid bait agent (when the total mass of the liquid bait agent is 100% by mass).

<Ingredient (C)>
The component (C) is a solvent. By containing the component (C), the liquid bait agent of the present invention can reduce the initial viscosity and enhance the eating habitability of pests. The component (C) is not particularly limited as long as it is a solvent capable of dissolving or dispersing the component (A) and the component (B).

When a pest eats a liquid bait agent, if the liquid bait agent becomes highly viscous or gels, the pest's edible property is reduced. Therefore, the component (C) is preferably a solvent that does not volatilize rapidly.
After the pest has eaten the liquid bait agent, the insecticidal effect can be further enhanced by allowing the insecticidal component to be transmitted by contact between the individual pests. Therefore, after the liquid bait agent adheres to the body surface of the pest, a solvent is preferable in which the component (C) is rapidly volatilized and the viscosity of the adhered liquid bait agent can be increased.
From the above viewpoint, the vapor pressure of the component (C) at 20 ° C. and 1013 hPa (1 atm) is preferably 0.01 Pa or more and 15000 Pa or less.
Further, the component (C) preferably contains a solvent having a high vapor pressure (component (C1)) and a solvent having a low vapor pressure (component (C2)).

((C1) component)
The component (C1) is a solvent having a high vapor pressure. Here, "high vapor pressure" means that the vapor pressure at 20 ° C. and 1013 hPa is 1000 Pa or more.
That is, the vapor pressure of the component (C1) at 20 ° C. and 1013 hPa is 1000 Pa or more, preferably 1000 Pa or more and 15000 Pa or less, and more preferably 3000 Pa or more and 10000 Pa or less. When the vapor pressure of the component (C1) is equal to or higher than the above lower limit value, the component (C1) is rapidly volatilized, and the viscosity of the liquid bait agent after adhering to the body surface of the pest is likely to increase. When the vapor pressure of the component (C1) is not more than the above upper limit value, it is easy to suppress the rapid volatilization of the component (C1) and reduce the initial viscosity of the liquid bait agent.

Examples of the component (C1) include water (3200 Pa), ethanol (7800 Pa), 1-propanol (1990 Pa), 2-propanol (4266 Pa), methanol (13000 Pa) and the like. The pressure in parentheses is the vapor pressure at 20 ° C. and 1013 hPa.
As the component (C1), water and ethanol are preferable, and water is more preferable, from the viewpoints of being able to reduce the initial viscosity of the liquid bait agent, volatilizing quickly after adhering to pests and easily increasing the viscosity to an appropriate level, and odor.
As the component (C1), one type may be used alone, or two or more types may be used in combination.

((C2) component)
The component (C2) is a solvent having a low vapor pressure. Here, "low vapor pressure" means that the vapor pressure at 20 ° C. and 1013 hPa is less than 1000 Pa.
That is, the vapor pressure of the component (C2) at 20 ° C. and 1013 hPa is less than 1000 Pa, preferably 0.01 Pa or more and less than 1000 Pa, and more preferably 0.01 Pa or more and 20 Pa or less. When the vapor pressure of the component (C2) is within the above numerical range, the volatilization of the liquid bait agent (component (C) and volatilization component) is suppressed, and the initial viscosity of the liquid bait agent can be easily reduced. In addition, it is easy to suppress the change in viscosity of the liquid bait agent, and it is easy to suppress the excessively high viscosity or gelation of the liquid bait agent due to the volatilization of the liquid bait agent.

Examples of the component (C2) include 1-butanol (600 Pa), ethylene glycol (7 Pa), diethylene glycol (0.8 Pa), triethylene glycol (0.2 Pa), propylene glycol (10.7 Pa), and dipropylene glycol (C2). 1.3 Pa), tripropylene glycol (0.7 Pa), butylene glycol (0.8 Pa), hexylene glycol (0.1 Pa), hexyl diglycol (0.01 Pa or less) and the like. The pressure in parentheses is the vapor pressure at 20 ° C. and 1013 hPa.
As the component (C2), ethylene glycol, propylene glycol, and dipropylene glycol are preferable, and dipropylene glycol is more preferable, from the viewpoint of suppressing excessive viscosity changes such as gelation of the liquid bait agent and odor.
As the component (C2), one type may be used alone, or two or more types may be used in combination.

The mass ratio represented by the component (C1) / component (C2) (hereinafter, also referred to as (C1) / (C2) ratio) is preferably 2 or more and 10 or less, and more preferably 4 or more and 7 or less. When the (C1) / (C2) ratio is within the above numerical range, the eating habitability of pests is likely to be enhanced. In addition, the component (C) volatilizes rapidly, making it easy to increase the viscosity of the liquid bait agent after it adheres to the body surface, and the volatilization of the liquid bait agent causes the liquid bait agent to become excessively viscous or gel. It is easy to suppress the change.

The content of the component (C) is preferably 50% by mass or more, more preferably 60% by mass or more, based on the total mass of the liquid bait agent. The upper limit of the content of the component (C) is not particularly limited, but for example, it is preferably 95% by mass or less with respect to the total mass of the liquid bait agent. When the content of the component (C) is equal to or higher than the above lower limit, the initial viscosity can be reduced, the eating habitability of the pest can be easily increased, and the viscosity of the pest after adhesion to the body surface can be easily increased. It is easy to prevent the liquid bait agent from becoming excessively viscous or gelling due to volatilization.

<Arbitrary ingredient>
The liquid bait agent of the present invention may contain any component other than the component (A), the component (B), and the component (C) as long as the effects of the present invention are not impaired.
Optional components include, for example, benzoic acid or a salt thereof (component (D)), polyvalent carboxylic acid or a salt thereof (component (E)), dietary component, surfactant, colorant, flavoring agent, (D). Preservatives excluding ingredients, accidental ingestion preventives, etc. can be mentioned.
These optional ingredients are not particularly limited, and those conventionally used in pharmaceuticals, quasi-drugs, cosmetics, etc. can be used.
As the optional component, one kind may be used alone, or two or more kinds may be used in combination.

(Component (D))
The component (D) is benzoic acid or a salt thereof. Liquid bait agents have a higher proportion of free water than solid bait agents, are more prone to the growth of microorganisms, and tend to be inferior in antiseptic properties. A liquid bait agent having poor antiseptic properties may have poor pest-eating properties and may not have a sufficient insecticidal effect. Therefore, it is preferable that the liquid bait agent improves the antiseptic property.
The liquid bait agent of the present invention contains the component (D) and improves the antiseptic property by setting the pH at 25 ° C. to 3.5 or more and 6.5 or less, and in addition, the stability of the component (A). It is easy to increase (difficulty in changing the component (A)), and it is easy to maintain the insecticidal effect of the liquid bait agent.

When the liquid bait agent of the present invention contains the component (D), the content of the component (D) is preferably 0.1% by mass or more and 5% by mass or less, preferably 0.3% by mass, based on the total mass of the liquid bait agent. More preferably, it is by mass% or more and 3% by mass or less. When the content of the component (D) is within the above numerical range, the antiseptic property is improved, and in addition, the stability of the component (A) is likely to be improved.
As the component (D), one type may be used alone, or two or more types may be used in combination.

(Ingredient (E))
The component (E) is a polyvalent carboxylic acid or a salt thereof. Since the liquid bait agent of the present invention contains the component (E), the pH can be easily adjusted and the stability of the component (A) can be easily improved.
Examples of the component (E) include malic acid, succinic acid, tartaric acid, citric acid and the like, and citric acid is preferable.
As the component (E), one type may be used alone, or two or more types may be used in combination.

When the liquid bait agent of the present invention contains the component (E), the content of the component (E) is preferably 0.001% by mass or more and 5% by mass or less, preferably 0.01, based on the total mass of the liquid bait agent. More preferably, it is by mass% or more and 3% by mass or less. When the content of the component (E) is within the above numerical range, the pH of the liquid bait agent can be easily adjusted.

The total amount of the components constituting the liquid bait agent of the present invention does not exceed 100% by mass.

The pH of the liquid bait agent of the present invention at 25 ° C. is preferably 3.5 or more and 6.5 or less, and more preferably 4.0 or more and 6.0 or less. When the pH of the liquid bait agent at 25 ° C. is equal to or higher than the above lower limit value, the stability of the component (A) is likely to be enhanced. When the pH of the liquid bait agent at 25 ° C. is not more than the above upper limit value, the antiseptic property of the liquid bait agent is likely to be improved.
In the present specification, pH means a value measured using a pH meter (product name: HM-30G, manufactured by DKK-TOA CORPORATION) with a measurement target of 25 ° C.

The viscosity (initial viscosity) of the liquid bait agent of the present invention at 25 ° C. is 20 mPa · s or less, preferably 0.6 mPa · s or more and 15 mPa · s or less, and more preferably 1.0 mPa · s or more and 10 mPa · s or less. .. When the viscosity of the liquid bait agent is within the above numerical range, the eating habitability of pests is likely to be enhanced. Therefore, the insecticidal effect can be further enhanced.
In the present specification, the viscosity of the liquid bait agent means a value measured using a B-type (Brookfield-type) viscometer, where the measurement target is 25 ° C.

When the total mass of the liquid bait agent becomes 50% by mass due to the volatilization of the liquid bait agent (component (C) and volatilization component), the viscosity at 25 ° C. is 40 mPa · s or more and 500 mPa · s or less, and 45 mPa · s. It is preferably 450 mPa · s or more, and more preferably 50 mPa · s or more and 200 mPa · s or less. When the viscosity when the total mass of the liquid bait agent reaches 50% by mass is within the above numerical range, the liquid bait agent adhering to the body surface of the pest does not easily drip, and when it comes into contact with other pests, it becomes a liquid. The bait agent is easily propagated (adhered). As a result, the extermination effect of individual pests and the entire group is enhanced.
In addition, in this specification, the total mass of the liquid bait agent is based on the total mass immediately before using the liquid bait agent. For example, when the liquid bait agent is contained in a container, the total mass of the liquid bait agent contained in the unopened container is 100% by mass.

In the present specification, for the time until the total mass of the liquid bait agent reaches 50% by mass, 200 g of the liquid bait agent is placed in a 200 mL glass beaker (body diameter 67 mm, height 90 mm), and the beaker is placed in a constant temperature bath at 70 ° C. As a guide, the time in the state of being put in is used as a guide. In the above state, the time until the total mass of the liquid bait agent reaches 50% by mass is preferably 24 to 168 hours, more preferably 48 to 120 hours, and even more preferably 72 to 96 hours. In the above state, when the time until the total mass of the liquid bait agent reaches 50% by mass is not more than the above lower limit value, the initial viscosity of the liquid bait agent can be easily maintained low. When it is not more than the above upper limit value, the liquid bait agent volatilizes appropriately, and it is easy to increase the viscosity of the pest after adhering to the body surface.
From the viewpoint of further enhancing the insecticidal effect, it is preferable that each component of the liquid bait agent is blended in the above state so as to satisfy the above time.

When the liquid bait agent adheres to the body surface of the pest, the liquid bait agent is stretched thinly like a thin film, and the surface area becomes large. In addition, as the pests move around, they are affected by the wind, increasing the volatility of the liquid. Therefore, even at room temperature (1 ° C. to 30 ° C.), the total mass of the liquid bait agent becomes 50% by mass in a shorter time than the above state.

The viscosity of the liquid bait agent can be adjusted by the type or content of the component (B), the type or content of the component (C), and a combination thereof.

[Manufacturing method of liquid bait agent]
The method for producing the liquid bait agent of the present invention is not particularly limited, and a known production method can be adopted. For example, the component (A), the component (B), and the component (D) and the component (E) are added to the component (C) as needed, and an optional component is added as needed, and the mixture is stirred. A method of obtaining a liquid bait agent can be mentioned.

[How to use liquid bait]
Examples of the method of using the liquid bait agent include a method in which the liquid bait agent of the present invention is contained in a container provided with a liquid absorbing core to form a pest control device, and the pest control device is installed in a place where the target pest is active. Can be mentioned.

[Pest control device]
Examples of the pest control device include the pest control device 1 as shown in FIG. The pest control device 1 includes a liquid bait agent L and a container 2 for accommodating the liquid bait agent L. The container 2 includes a bottle 10, a columnar liquid absorbing core 30, and a sealing member 50 that covers the upper end surface 30a of the liquid absorbing core 30.

The bottle 10 includes a disk-shaped bottom surface portion 22 and a top surface portion 14. The top surface portion 14 rises from the peripheral edge of the bottom surface portion 22 over the entire circumference, and has a tubular shoulder portion 20 that narrows in an arc shape as it goes upward, and the upper end portion of the shoulder portion 20 so as to close the upper end opening of the shoulder portion 20. It is provided with a disk-shaped flat plate portion 16 provided in the above. In this way, the bottle 10 has a dome shape. An opening 12 having a circular plan view is formed in the central portion of the flat plate portion 16 on the top surface portion 14.

The material of the bottle 10 may be any material that does not affect the stability of the liquid bait agent, and examples thereof include olefins such as polypropylene and polyethylene, polyethylene terephthalate (PET), and glass.

Further, the top surface portion 14 of the bottle 10 is provided with a liquid absorption core installation portion 40 for installing the liquid absorption core 30 by fitting a cylindrical inner plug 42 into the opening 12. The inner plug 42 is for holding the liquid absorbing core 30 in the bottle 10. In the liquid absorbing core installation portion 40, the liquid absorbing core 30 is inserted into the inner plug 42 so that the upper end surface 30a of the liquid absorbing core 30 is flush with the upper surface of the flat plate portion 16 on the top surface portion 14, thereby opening. The liquid absorbing core 30 is provided downward from the portion 12.

The material of the inner plug 42 may be any moldable material, and examples thereof include polyethylene, polyester, and polypropylene.

The liquid absorbing core 30 is a chemical holding body that sucks up the liquid bait agent L contained in the bottle 10 by capillary action and causes pests to eat the chemical solution.
The length of the liquid absorbing core 30 may be appropriately set according to the size of the bottle 10, and is preferably a length in contact with the inner bottom surface of the bottle 10.
The cross-sectional shape perpendicular to the axial direction of the liquid absorbing core 30 is circular in this example, but is not particularly limited, and may be a polygonal shape such as a quadrangle, a pentagon, or a hexagon, or a star shape. ..

The liquid absorbing core 30 includes, for example, those formed by heat fusion of fibers such as glass fibers, resin fibers (nylon, polyester, etc.) and natural fibers, and those formed by bonding with an adhesive, those formed from non-woven fabric or wood, and the like. Alternatively, a matrix composed of one or more kinds of powders selected from inorganic and organic substances is kneaded together with a resin binder and molded by extrusion molding, compression molding or the like.

A sealing member 50 is provided on the liquid absorbing core 30 so as to cover the upper end surface 30a thereof.
By peeling off the seal member 50, as shown in FIG. 2, the upper end surface 30a of the liquid absorbing core 30 can be exposed from the opening 12.
The sealing member 50 can be detachably attached to the upper end surface 30a of the liquid absorbing core 30 and can suppress the evaporation of the liquid component of the liquid bait agent L contained in the bottle in that state. Just do it. Examples of the material of the sealing member 50 include aluminum, polypropylene, polyethylene, PET and the like.

In the container 2, the entire top surface portion 14 of the bottle 10 serves as a scaffolding 18 for pests that eat the liquid bait agent L from the upper end surface 30a of the liquid absorbing core 30. As described above, in the container 2, the scaffolding 18 is provided on the entire circumference of the opening 12 in the top surface portion 14.

After peeling off the seal member 50, the pest that approaches the pest control device 1 puts its forefoot on the scaffold 18 and eats the liquid bait agent L from the upper end surface 30a of the liquid absorbing core 30, resulting in death.
Further, in the liquid bait agent L adhering to the body surface of the pest from the upper end surface 30a of the liquid absorbing core 30 in the opening 12, the component (C) is volatilized and the concentration of the component (A) is increased. The pest individual to which the liquid bait agent L is attached to the body surface then returns to the pest nest and comes into contact with the other individual, so that the component (A) (insecticidal component) is transmitted to the other individual. As a result, in the pest nest, the entire group of pests is killed, and the pest control device 1 exerts a better insecticidal effect.

[Pest control method]
The pest control method of the present invention is a method of exterminating pests using the liquid bait agent of the present invention.
As the pest control method of the present invention, a known method can be adopted except that the liquid bait agent of the present invention is used. For example, a method of accommodating the liquid bait agent of the present invention in the container 2 described above to form a pest control device 1 and installing the pest control device 1 in a place where the target pest is active can be mentioned.

The liquid bait agent of the present invention described above is highly edible by pests by controlling the initial viscosity and the viscosity when the total mass reaches 50% by mass by combining the components (A) to (C). , The insecticidal effect is sufficiently obtained. Furthermore, by combining the components (D) to (E), it is possible to have excellent antiseptic properties and suppress the deterioration of the eating habits of pests.
The liquid bait agent of the present invention makes it difficult for the liquid bait agent adhering to the body surface of the pest to drip. Therefore, it is advantageous in that the insecticidal effect of the liquid bait agent adhering to the body surface of the pest can be easily transmitted to the pest nest as compared with the conventional liquid bait agent. Therefore, it has high vitality and is particularly effective as a liquid bait agent for cockroaches that flock in nests.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.
The raw materials used in this example are as shown in [Raw materials used] below.

[Raw materials used]
<Ingredient (A)>
A-1: Fipronil, manufactured by Sumitomo Chemical Co., Ltd., "Bakuda" (trade name).
A-2: Dinotefuran, manufactured by Hayashi Junyaku Kogyo Co., Ltd., "Dinotefuran" (trade name).

<Ingredient (B)>
B-1: Syrup, manufactured by Japan Corn Starch Co., Ltd., "Corsocil Wrap H75C" (trade name), containing 25% by mass of water.
B-2: Xanthan gum, manufactured by DSP Gokyo Food & Chemical Co., Ltd., "Monato Gum" (trade name).
B-3: Carboxymethyl cellulose (CMC), manufactured by Daicel Finechem Co., Ltd., "CMC1220" (trade name).

<Ingredient (C)>
((C1) component)
C1-1: Water, ion-exchanged water.
((C2) component)
C2-1: Dipropylene glycol (DPG), manufactured by ADEKA Corporation, "DPG-RF" (trade name).
C2-2: Propylene glycol (PG), manufactured by Wako Pure Chemical Industries, Ltd., "Propylene glycol" (trade name).

<Arbitrary ingredient>
(Component (D))
D-1: Sodium benzoate, manufactured by Fushimi Pharmaceutical Co., Ltd., "Sodium benzoate" (trade name).
(Ingredient (E))
E-1: Citric acid (pH adjuster), manufactured by Fuso Chemical Industry Co., Ltd., "citric acid" (trade name).

POE hardened castor oil: Polyoxyethylene (60) hardened castor oil, manufactured by Nikko Chemicals Co., Ltd., "HCO-60" (trade name).
Sesame oil: Made by Kaneda Co., Ltd., "Japanese Pharmacopoeia sesame oil" (trade name).
Glucose: "D (+)-glucose" (trade name) manufactured by Wako Pure Chemical Industries, Ltd.

[Examples 1 to 13, Comparative Examples 1 to 4]
According to the composition of Tables 1 to 3, each component is weighed in a predetermined amount, sufficiently stirred and mixed with a stirrer (BL1200 manufactured by Shinto Kagaku Co., Ltd.), the pH is adjusted using the component (E), and the liquid is adjusted. Obtained a bait agent.
The obtained liquid bait agent was evaluated for viscosity, edible property, initial insecticidal effect, insecticidal effect after storage, and antiseptic property by the following evaluation methods. The results are shown in Tables 1-3.
The unit of the blending amount of each component in the table is "mass%", which indicates the net conversion amount. However, Examples 2, 3, 7, 9, 12, and 13 are reference examples.

<Viscosity measurement>
Immediately after production, 100 g of a liquid bait agent was filled in a 100 mL glass container (body diameter 40 mm, height 120 mm, SV-100 manufactured by Nichiden Rika Glass Co., Ltd.) and subjected to viscosity (initial viscosity) measurement at 100% by mass ( Composition α).
200 g of the liquid bait agent immediately after production is filled in a 200 mL glass beaker (body diameter 67 mm, height 90 mm) and placed in a constant temperature bath (70 ° C.) so that the mass of the liquid bait agent is 50% by mass with respect to the initial mass. I took it out when it became. After uniformly mixing the removed liquid bait agent, the liquid bait agent was transferred to a 100 mL glass container (body diameter 40 mm, height 120 mm, SV-100 manufactured by Nichiden Rika Glass Co., Ltd.) and subjected to viscosity measurement at 50% by mass (composition). β).

(Viscosity measurement method)
The compositions α and β were adjusted to 25 ° C. in a constant temperature bath set at 25 ° C. Next, each composition at 25 ° C. was set in a B-type viscometer (“BL-II” manufactured by Toki Sangyo Co., Ltd., rotor numbers: Nos. 1 to 4), and the rotor rotation speed was 6 to 60 rpm. The rotation was started, and the viscosity was measured 1 minute after the start of rotation. Rotor No. The conditions under which the rotor rotation speed can be measured appropriately were selected.

<Evaluation of eating habits>
Two pieces of cotton wool (length 40 mm x width 40 mm) were stacked and packed in a plastic petri dish (diameter 27 mm, height 15 mm), and impregnated with 8 g of the liquid bait agent of each example. After measuring the mass of the absorbent cotton impregnated with the liquid bait agent, the insecticidal effect test described later was carried out, and then the mass of the absorbent cotton was measured again to calculate the reduction amount W1 (mg) of the liquid bait agent. Separately, the mass of cotton wool impregnated with 8 g of liquid bait agent was measured in the same manner, and the mass of cotton wool was measured again after being allowed to stand in the same environment as the insecticidal effect test except that there were no test insects. Then, the naturally reduced amount W2 (mg) of the liquid bait agent was calculated. Then, the value obtained by subtracting the naturally reduced amount W2 from the reduced amount W1 was defined as the edible amount (mg). Eating habits were evaluated based on the following evaluation criteria, and ◎ and ○ were judged as acceptable.
"Evaluation criteria"
⊚: Eating amount 110 mg or more.
◯: Eating amount 90 mg or more and less than 110 mg.
Δ: Eating amount 50 mg or more and less than 90 mg.
X: Eating amount less than 50 mg.

<Evaluation of insecticidal effect (initial)>
A piece of paper 5 cm long x 7 cm wide folded in a bellows shape to a size of 5 cm long x 5 cm wide ^{was installed in a 5 m 2} test device to serve as a hiding place. Two solid feeds for mice (CE-2 manufactured by Claire Japan, Inc.) were placed in the test apparatus to form a test plot.
Twenty German cockroaches were released into the test plot and acclimatized to the test plot overnight (about 16 hours). After acclimatization, cotton wool impregnated with a liquid bait agent was given to the test plot, and the number of dead insects was measured to determine the mortality rate. The initial insecticidal effect was evaluated based on the following evaluation criteria, and ◎◎, ◎ and ○ were passed.
"Evaluation criteria"
◎◎: Case fatality rate 100%.
⊚: Case fatality rate of 80% or more and less than 100%.
◯: Case fatality rate of 50% or more and less than 80%.
Δ: Case fatality rate of 30% or more and less than 50%.
X: Case fatality rate is less than 30%.

<Evaluation of eating habits and insecticidal effect (after storage)>
The liquid bait agent was placed in a constant temperature bath at 50 ° C. and stored for 3 months, and cotton wool impregnated with this sample was used to evaluate the eating habits and insecticidal effect as in the initial stage.

<Evaluation of antiseptic properties>
A 30 mL plastic container was filled with 20 mL of the liquid bait agent obtained in each example to prepare an evaluation sample. An environment-derived gram-negative bacterium (bacillus) was used as a test bacterium, and a bacterial suspension was prepared so as to have a concentration of about 108 to 109 cells / mL by culturing in a suitable medium. 0.2 mL of the bacterial suspension was added to the evaluation sample and mixed well to prepare a mixed solution for evaluation, which was stored in a dark place under the condition of 20 ° C.
Then, 1 day after the start of storage, 1 mL of the evaluation mixture was aseptically collected and diluted and mixed with 9 mL of a liquid medium (soybean, casein, digest, lecithin, polysorbate 80). 1 mL of the diluted mixed solution was taken in a petri dish, mixed with agar medium X (agar, soybean, casein, digest, lecithin, polysorbate 80), cultured at 30 ° C. for 4 days, and then the number of surviving bacteria was measured. Similarly, the evaluation mixture was collected 4 days, 7 days, 14 days, and 28 days after the start of storage, and the number of surviving bacteria after culturing was measured.

In addition, using environment-derived yeast as the test bacterium, the number of surviving bacteria was measured in the same manner as in the case of Gram-negative bacteria except for the following conditions. The storage temperature of the evaluation mixture was changed to 25 ° C.
Agar medium Y (agar, glucose, peptone, lecithin, polysorbate 80) was used instead of agar medium X for plying. Culturing was carried out at 25 ° C. for 7 days.

The antiseptic property was evaluated according to the following evaluation criteria based on the number of days until the number of viable bacteria of either Gram-negative bacteria or yeast became below the detection limit (10 cells / mL or less).
"Evaluation criteria"
⊚: Within 7 days.
◯: 8th to 14th.
Δ: Although it is 15 days or more, the bacteria are found to be killed.
X: No killing of bacteria is observed.

As shown in Tables 1 to 3, Examples 1 to 13 to which the present invention was applied were found to be excellent in edibleness, with initial edibleness and edibleness after storage being "⊚" or "◯". In addition, the initial insecticidal effect and the insecticidal effect after storage were "◎◎" to "○", and it was found that the insecticidal effect was excellent. Furthermore, it was found that the antiseptic property was "◎" or "○" and the antiseptic property was excellent.
On the other hand, in Comparative Example 1 containing no component (B), the insecticidal effect is “x” and the viscosity when the total mass of the liquid bait agent is 50% by mass is outside the applicable range of the present invention. In 4, the insecticidal effect was "△" to "×".

According to the pest control liquid bait agent of the present invention, it was found that the insecticidal effect was superior.

1 Pest control device 2 Container 10 Bottle 12 Opening 14 Top surface 16 Flat plate 18 Scaffolding 20 Shoulder 22 Bottom surface 30 Liquid absorption core 30a Top surface 40 Liquid absorption core installation part 42 Inner plug 50 Seal member

Claims (5)

Contains (A) component: insecticidal component, (B) component: thickener, and (C) component: solvent.
The component (A) is fipronil or dinotefuran.
The component (B) is starch syrup,
The component (C) contains (C1) component: water and (C2) component: one or more selected from propylene glycol and dipropylene glycol.
The content of the component (B) is 15% by mass or more and 30% by mass or less with respect to the total mass.
The mass ratio represented by the component (C1) / component (C2) is 5.6 or more and 7 or less.
The viscosity at 25 ° C. is 20 mPa · s or less,
A liquid bait agent for pest control having a viscosity of 40 mPa · s or more and 500 mPa · s or less at 25 ° C. when the total mass reaches 50% by mass. The liquid bait agent for pest control according to claim 1, wherein the vapor pressure of the component (C) at 20 ° C. and 1013 hPa is 0.01 Pa or more and 15000 Pa or less. The vapor pressure of the component (C1) at 20 ° C. and 1013 hPa is 1000 Pa or more and 15000 Pa or less.
The pest control liquid bait agent according to claim 1 or 2, wherein the vapor pressure of the component (C2) at 20 ° C. and 1013 hPa is 0.01 Pa or more and less than 1000 Pa. (D) The pest control liquid bait according to any one of claims 1 to 3 , further containing benzoic acid or a salt thereof and having a pH of 3.5 or more and 6.5 or less at 25 ° C. Agent. A pest control device comprising the pest control liquid bait agent according to any one of claims 1 to 4 and a container containing the pest control liquid bait agent.

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