Pest Poison Bait Agent and Method for Prolonging the Feeding Time of Pest Poison Bait Agent

Abstract

To provide a poison bait for pest control that suitably attracts pests to eat the bait for an extended time period and kills them, and also has high stability over time.SOLUTION: A poison bait for pests contains (A) at least one selected from the group consisting of acrylate polymers, isobutylene-maleic anhydride copolymers and salts thereof, and laminar silicates, and (B) a pest control component, with a viscosity of 200-80000 cps.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a poison bait for pests and a method for extending the feeding time of the poison bait for pests. [Background technology]

[0002] Conventionally, for the purpose of pest control, poison baits that are made by adding pest control ingredients to food ingredients that pests like have been used. Various types of poison baits have been proposed, and for example, Patent Document 1 discloses a poison bait for pest control that uses a gelling agent as a base material and contains fipronil as an active ingredient. The poison bait for pest control described in Patent Document 1 is made by mixing a gelling agent with water, heating it to make it liquid, adding a specific ingredient such as fipronil, and cooling it to solidify it. Patent Document 2 also discloses a poison bait for ants that is made of a mass aggregate of insecticidal granular bait bound with a binder such as dextrin. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 9-87111 [Patent Document 2] JP 2000-1402 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the above-mentioned solid poison baits are not necessarily sufficient in terms of edibility and lethality. In addition, when polymers are blended, they may cause water loss or browning over time, and there is room for improvement in terms of stability over time.

[0005] In view of the above circumstances, an object of the present invention is to provide a poisonous bait agent for pests, which has excellent feeding properties, feeding time, and lethal efficacy against pests and is also excellent in stability over time. Another object of the present invention is to provide a method for extending the feeding time of a poisonous bait agent for pests, which lengthens the feeding time of the poisonous bait agent for pests to improve the lethal efficacy.

Means for Solving the Problems

[0006] The present invention relates to the following [1] to [4]. [1] One or more selected from the group consisting of (A) an acrylate polymer, an isobutylene-maleic anhydride copolymer and its salt, and a layered silicate, and (B) a pest control component, A poisonous bait agent for pests having a viscosity of 200 to 80,000 cps. [2] The poisonous bait agent for pests according to [1] above, wherein the pest control component is one or more selected from the group consisting of dinotefuran, imidacloprid, fipronil, and hydramethylnon. [3] The poisonous bait agent for pests according to [1] or [2] above, wherein the poisonous bait agent for pests contains water, and the blending amount of the water in the poisonous bait agent for pests is 30 to 90% by mass. [4] A method for extending the feeding time of a poisonous bait agent for pests, which comprises blending one or more selected from the group consisting of (A) an acrylate polymer, an isobutylene-maleic anhydride copolymer and its salt, and a layered silicate into a poisonous bait agent for pests containing (B) a pest control component to make the viscosity 200 to 80,000 cps.

Effects of the Invention

[0007] The poisonous bait agent for pests of the present invention contains specific components and has a viscosity adjusted within a certain range, so that it has excellent feeding properties against pests, preferably crawling pests, particularly ants having liquid-absorbing properties. Further, with such a configuration, the time (feeding time) for pests to feed on the poisonous bait agent for pests can be lengthened, and the amount of the poisonous bait agent for pests taken into the bodies of pests can be increased. Therefore, the poisonous bait agent for pests of the present invention is also excellent in lethal efficacy. Furthermore, the poisonous bait agent for pests of the present invention is suppressed in browning and water separation over time and is also excellent in stability over time.

Mode for Carrying Out the Invention

[0008] The poison bait for pests according to this embodiment contains (A) at least one selected from the group consisting of acrylate polymers, isobutylene / maleic anhydride copolymers and their salts, and layered silicates, and (B) a pest control component, and has a viscosity of 200 to 80,000 cps. The poison bait for pests according to this embodiment is obtained, for example, by appropriately mixing a viscosity modifier containing the above (A), (B) a pest control component, a solvent and other contained components, and its preparation method is not particularly limited. Preferably, it is obtained by mixing a viscosity modifier containing (A) into a liquid preparation in which (B) a pest control component and other contained components are previously mixed in a solvent. Hereinafter, unless otherwise specified, the configuration of the poison bait for pests according to this embodiment will be described by taking as an example the case of obtaining a poison bait for pests by mixing a viscosity modifier containing (A) into a liquid preparation.

[0009] (Viscosity Modifier) The viscosity modifier is a component having water absorption and capable of imparting viscosity when added to a liquid preparation. The viscosity modifier contains at least one selected from the group consisting of (A) acrylate polymers, isobutylene / maleic anhydride copolymers and their salts, and layered silicates. Such component (A) has good stability over time and palatability to pests when combined with the liquid preparation described later.

[0010] That is, the above (A) can sufficiently hold the liquid preparation to the extent that it does not separate from water, so it is considered to have excellent property stability. In addition, the above (A) is less likely to cause a change in color tone (browning) over time when combined with the liquid preparation. For these reasons, it is considered that the poison bait for pests according to this embodiment has excellent stability over time by using a viscosity modifier containing (A). Furthermore, when the above (A) is used, the surface of the poison bait for pests becomes moderately wet after absorbing water, so it is likely to have a surface property that pests do not avoid and are easy to eat, and it is considered that the palatability becomes good. Among them, from the viewpoints of better palatability and stability over time, it is preferable that the viscosity modifier contains an acrylate polymer.

[0011] The acrylate polymer is a polymer compound having water absorption. Examples of the acrylate polymer include polyacrylate or its cross-linked product, acrylic acid / acrylic acid salt copolymer or its cross-linked product, etc. From the viewpoint of not impairing the eating properties of pests, an acrylic acid / acrylic acid salt copolymer or its cross-linked product is preferable. Examples of the salt include sodium salt and potassium salt. A polymer of sodium salt is more preferable because it has excellent transparency and is easily available. That is, an acrylic acid / sodium acrylate copolymer or its cross-linked product is more preferable, and a cross-linked product of an acrylic acid / sodium acrylate copolymer is even more preferable. Examples of commercially available products include Aquakeeper (registered trademark) 10SH-NF (manufactured by Sumitomo Seika Chemicals Co., Ltd., cross-linked product of acrylic acid / sodium acrylate copolymer), Aquakeeper (registered trademark) 10SH-NFC (manufactured by Sumitomo Seika Chemicals Co., Ltd., cross-linked product of acrylic acid / sodium acrylate copolymer), Aquakeeper (registered trademark) CA180N (manufactured by Sumitomo Seika Chemicals Co., Ltd., cross-linked product of acrylic acid / sodium acrylate copolymer), etc. These may be used alone or in combination of two or more.

[0012] The isobutylene / maleic anhydride copolymer and its salt are polymer compounds having water absorption. Examples of the isobutylene / maleic anhydride copolymer and its salt include isobutylene / maleic anhydride copolymer and its salt, or their cross-linked products, etc. Examples of the salt include sodium salt and ammonium salt, and among them, sodium salt is preferable. That is, a sodium salt of isobutylene / maleic anhydride copolymer or its cross-linked product is more preferable, and a cross-linked product of a sodium salt of isobutylene / maleic anhydride copolymer is even more preferable. Examples of commercially available products include KI Gel 201K F2 (manufactured by Kuraray Trading Co., Ltd., cross-linked product of sodium salt of isobutylene / maleic anhydride copolymer), KI Gel 201K (manufactured by Kuraray Trading Co., Ltd., cross-linked product of sodium salt of isobutylene / maleic anhydride copolymer), etc. These may be used alone or in combination of two or more.

[0013] As the layered silicate, clay minerals having water absorbency (swelling property) and the like can be preferably used. Specifically, for example, smectite-type clay minerals and the like can be mentioned. Examples of the smectite-type clay minerals include hectorite, montmorillonite, saponite and the like. From the viewpoint of thixotropy suitable for formulation and pest eating, hectorite is preferred. Since the pest control bait agent has thixotropy, the viscosity decreases during pest eating, and the eatability can be enhanced. Hectorite is not particularly limited, but for example, synthetic hectorite can be preferably used. Examples of available commercial products include Laponite RD (manufactured by Rockwood Additives Limited, synthetic hectorite), Laponite RDS (manufactured by Rockwood Additives Limited, synthetic hectorite) and the like. These may be used alone or in combination of two or more.

[0014] The viscosity modifier may consist of the above (A), or may further contain other viscosity modifying components as long as the effects of the present invention are not inhibited. Examples of other viscosity modifying components include xanthan gum, gum arabic, guar gum, carrageenan, pectin, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose and the like.

[0015] The shape of the viscosity modifier is not particularly limited as long as a pest bait agent having a desired viscosity can be obtained by adding it to the liquid agent. However, from the viewpoint of easily imparting viscosity uniformly to the liquid agent, it is preferably in powder form in the dry state. In particular, it is preferable that the average particle size of the above (A) is appropriately adjusted. Specifically, for example, the average particle size of (A) is preferably 5 to 250 μm, more preferably 7 to 100 μm, and even more preferably 10 to 30 μm. An average particle size of 5 μm or more is preferable because it can suppress scattering during formulation. Also, an average particle size of 250 μm or less is preferable because it is likely to exhibit a gel-like property after absorbing the liquid, and can improve the palatability and feeding time. In this specification, the average particle size refers to the value measured using the optical microscope "OLYMPUS BX53". For 10 particles randomly selected from the observation image, the longest diameter of each particle is measured using the imaging software "CellSens Standard", and the average value is calculated as the average particle size.

[0016] (Viscosity) The pest bait agent according to this embodiment has a viscosity of 200 to 80,000 cps. The viscosity is more preferably 1,000 to 50,000 cps, even more preferably 3,000 to 10,000 cps, and particularly preferably 4,000 to 9,000 cps. A viscosity within the above range is preferable because it can extend the feeding time of the pest bait agent.

[0017] The pest bait agent of the present invention contains the above-described viscosity modifier and has a viscosity adjusted within the above range, so that the palatability to pests is good, and furthermore, the feeding time of pests can be lengthened. As a result, it has been found that the uptake amount of the bait agent can be increased and the lethal efficacy is excellent. When the viscosity is within the above range, it relatively contains a large amount of moisture and is likely to become a gel-like or viscous and fluid liquid. The poison bait for pests according to this embodiment is considered to be easy for pests to eat, capable of improving palatability, and extending the eating time because, in addition to the viscosity modifier itself having excellent palatability to pests, having such properties makes it easier for pests to eat. Such properties are suitable for pests that prefer baits containing a large amount of water, preferably crawling pests, more preferably ants, and even more preferably ants having a liquid-absorbing property. On the other hand, when the viscosity exceeds 80,000 cps, it tends to become a non-fluid paste or solid state, and it becomes difficult to obtain the above-mentioned preferable properties. Also, it is preferable that the viscosity is within the above range because it can suppress the spilling of the poison bait when the poison bait container is tilted.

[0018] As the viscosity, in the range of 0 to 10,000 cps, the value measured at a rotational speed of 60 rpm at a formulation temperature of 25°C using a B-type viscometer and an M4 rotor can be used. In the range of 10,000 to 80,000 cps, the value measured at a rotational speed of 50 rpm at a formulation temperature of 25°C using an R-type viscometer and an M7 rotor can be used.

[0019] The viscosity can be controlled, for example, by adjusting the content of the viscosity modifier in the poison bait for pests. The blending amount of the viscosity modifier may be appropriately adjusted according to the type of the viscosity modifier used, etc., but it is particularly preferable that the ratio of (A) to the total amount of the poison bait for pests is adjusted within an appropriate range. Specifically, for example, the acrylate polymer is preferably 0.5 to 10% by mass, more preferably 1 to 2% by mass, based on the total amount of the poison bait for pests. Similarly, the isobutylene maleic anhydride copolymer and its salts are preferably 0.5 to 10% by mass, more preferably 1 to 2% by mass, based on the total amount of the poison bait for pests. The layered silicate is preferably 1 to 8% by mass, more preferably 2 to 4% by mass, based on the total amount of the poison bait for pests. Also, the mass ratio of (A) to the solvent ((A) / solvent) is preferably 0.005 to 0.35, more preferably 0.01 to 0.15, and particularly preferably 0.012 to 0.08.

[0020] In addition, the viscosity may change when a viscosity modifier is added depending on the pH of the liquid preparation. From the perspective of the stability of the pest bait agent, the pH of the liquid preparation is preferably from 4 to 8, more preferably from 5 to 7, and even more preferably from 6 to 7. To adjust the pH, a pH adjuster may be appropriately added to the liquid preparation. Examples of the pH adjuster include acids such as citric acid, succinic acid, malic acid, phosphoric acid, etc. or their salts; alkalis such as sodium carbonate, sodium hydrogen carbonate, sodium hydroxide, etc.

[0021] When adding a pH adjuster, the blending amount of the pH adjuster relative to the total amount of the pest bait agent is preferably 0.1 to 1% by mass, more preferably 0.2 to 0.7% by mass, from the perspective of making the viscosity of the preparation within an appropriate range and stabilizing the pest control component.

[0022] Note that the pH of the pest bait agent with the viscosity modifier added decreases compared to the pH of the liquid preparation. The pH of the pest bait agent is preferably from 3 to 7, more preferably from 4 to 6.5, and even more preferably from 5.1 to 6.1, from the perspective of making the viscosity of the pest bait agent within an appropriate range and stabilizing the pest control component.

[0023] (Liquid preparation) The components contained in the liquid preparation are not particularly limited. For example, it contains a solvent, (B) a pest control component, and components other than the viscosity modifier that the pest bait agent contains in addition to these components and (A). As long as a pest bait agent with a desired viscosity can be obtained in combination with the viscosity modifier containing the above (A). Since the pest bait agent according to this embodiment preferably contains relatively more water, the components contained in the liquid preparation are also preferably easily soluble in water. By adding the above viscosity modifier to the liquid preparation, viscosity is imparted, and the pest bait agent according to this embodiment is obtained.

[0024] (Solvent) Examples of the solvent include water, organic solvents, and mixtures thereof. Examples of water include distilled water, tap water, deionized water, pure water, etc. Examples of organic solvents include methanol, ethanol, propanol, 2-propanol, tert-butyl alcohol, ethylene glycol, propylene glycol, etc.

[0025] The amount of the solvent in the total amount of the pest poison bait is preferably 30 to 90% by mass, more preferably 40 to 70% by mass, and even more preferably 50 to 70% by mass from the viewpoint of making the viscosity of the preparation appropriate and stabilizing the pest control component. The solvent preferably contains water from the viewpoints of solubility of the pest control component, attractant (especially sugar), etc., and improving palatability. The amount of water in the pest poison bait is preferably 30 to 90% by mass, more preferably 40 to 70% by mass, and even more preferably 50 to 70% by mass.

[0026] The pest poison bait according to the present embodiment contains a pest control component. The pest poison bait preferably further contains an attractant. That is, the liquid preparation contains a pest control component and preferably further contains an attractant.

[0027] (Pest control component)

[0025] As the pest control component, a component having an insecticidal action or the like on pests can be used, and a component that improves the insecticidal action by combining with an insecticidal component may be combined. As the insecticidal action, it preferably has an insecticidal action by ingestion poison.

[0028] Specific examples of the pest control component include neonicotinoid compounds such as dinotefuran and imidacloprid; phenylpyrazole compounds such as fipronil; organophosphorus compounds such as dichlorvos and fenitrothion; carbamate compounds such as propoxur, phenobucarb, and carbaryl; fluorine compounds such as hydramethylnon; boric acid, borax, amidoflumet, isobornyl thiocyanoacetate (IBTA), isobornyl thiocyanoethyl ether (IBTE), other compounds having an insecticidal action, natural products, and extracts thereof. These may be used alone or in combination of two or more. As pest control ingredients, from the viewpoints of having water solubility and excellent stomach poisoning effects, neonicotinoid compounds, phenylpyrazole compounds, and fluorine compounds are preferred, and neonicotinoid compounds are more preferred. More specifically, the pest control ingredient is preferably at least one selected from the group consisting of dinotefuran, imidacloprid, fipronil, and hydramethylnon, and more preferably dinotefuran.

[0029] The blending amount of the pest control ingredient relative to the total amount of the pest poison bait agent is not particularly limited as long as the desired pest control effect can be obtained. For example, 0.001 to 10% by mass is preferred, 0.005 to 1% by mass is more preferred, and 0.01 to 0.5% by mass is even more preferred. It is preferable that the pest control ingredient is 0.001% by mass or more because it is easy to obtain sufficient lethal efficacy. Also, it is preferable that it is 10% by mass or less because the solubility of the blending ingredient in the solvent and the stability over time of the pest poison bait agent are good.

[0030] (Attractant) As the attractant, various attractant substances having an attracting effect on pests can be used. For example, diet components such as proteins, sugars (carbohydrates), and lipids, natural product-derived and formulated aromatic components, pheromones, etc. can be mentioned. These attractant substances may be used alone, or substances or processed products containing one or more of these attractant substances may be used. As the attractant, water-soluble substances such as sugars, sweeteners containing sugars, and fruit juices are preferred, and sugars and sweeteners containing sugars are more preferred from the viewpoint of attracting various pests. Examples of sugars include monosaccharides such as glucose and fructose, and disaccharides such as sucrose and maltose. From the viewpoints of palatability and solubility in the liquid agent, sucrose is preferred. Also, examples of sweeteners containing sugars include granulated sugar, starch syrup, and black sugar, and granulated sugar is preferred from the viewpoint of excellent solubility in the liquid agent.

[0031] The blending amount of the attractant with respect to the total amount of the pest poison bait agent is not particularly limited as long as the desired pest attracting effect can be obtained. For example, 1 to 70% by mass is preferable, 5 to 60% by mass is more preferable, and 10 to 50% by mass is even more preferable. It is preferable that the attractant is 1% by mass or more because the attractiveness and palatability are good. Also, it is preferable that it is 50% by mass or less because it can suppress the decrease in the water retention property of the pest poison bait agent.

[0032] (Additive) Within the range that does not inhibit the effects of the present invention, the above-mentioned pH adjuster and additives as shown below may be further contained. Examples of additives other than the pH adjuster include preservatives, anti-ingestion agents, antioxidants, colorants, ultraviolet absorbers, surfactants, and the like.

[0033] Examples of the preservative include potassium sorbate, sodium benzoate, benzoic acid, ε-polylysine, parabens, cetylpyridinium chloride, and the like.

[0034] Examples of the anti-ingestion agent include sodium denatonium benzoate, pepper extract, and the like.

[0035] Examples of the antioxidant include butylhydroxytoluene, green tea extract, tocopherol, sodium erythorbate, L-ascorbic acid, and the like.

[0036] Examples of the colorant include synthetic colorants such as Food Blue No. 1 and Food Yellow No. 4, and natural pigments such as caramel pigments.

[0037] Examples of the ultraviolet absorber include resorcinol-based compounds, triazine-based compounds, benzotriazole-based compounds, hydroxyphenyltriazine-based compounds, and the like.

[0038] Examples of the surfactant include polyoxyethylene hydrogenated castor oil, glycerin fatty acid ester, sucrose fatty acid ester, sorbitan fatty acid ester, and the like.

[0039] (Manufacturing method) The manufacturing method of the pest bait agent according to this embodiment includes, for example, a step of preparing a liquid agent containing a solvent, (B) a pest control component, and other contained components, and a step of adding one or more selected from the group consisting of (A) an acrylate polymer, an isobutylene / maleic anhydride copolymer and its salts, and a layered silicate to the liquid agent. A method of setting the viscosity of the obtained pest bait agent to 200 to 80,000 cps is preferable. That is, from the viewpoint of obtaining a pest bait agent in which each contained component is more homogeneously mixed, it preferably includes mixing a viscosity modifier containing (A) with a liquid agent in which (B) the pest control component and other contained components are previously mixed in a solvent. Here, other contained components refer to each component other than the viscosity modifier, the pest control component, and the solvent.

[0040] In the step of preparing the liquid agent, the pest control component and other contained components are added to the solvent and stirred and dissolved. Other contained components preferably include an attractant. The stirring time may be appropriately adjusted according to the components to be added, but for example, about 15 to 30 minutes is preferable.

[0041] Next, one or more selected from the group consisting of (A) an acrylate polymer, an isobutylene / maleic anhydride copolymer and its salts, and a layered silicate are added to the liquid agent. The addition of (A) is preferably carried out while stirring. Also, after the addition, it is preferable to let it stand until (A) completely absorbs the liquid agent. The standing time is preferably about overnight, specifically about 12 to 24 hours. Also, within a range that does not inhibit the effects of the present invention, in addition to (A), the other viscosity adjusting components described above may be added. The preferable blending amounts of the viscosity modifier, the pest control component, the solvent, and other contained components are the same as the above-described preferable blending amounts.

[0042] As described above, the method for producing the pest bait agent according to the present embodiment may be any method as long as it contains (A) at least one selected from the group consisting of acrylate polymers, isobutylene-maleic anhydride copolymers and salts thereof, and layered silicates, and (B) a pest control component, and can obtain a pest bait agent having a viscosity of 200 to 80,000 cps, and is not limited to the above-described preferred method. Specifically, after adding a viscosity modifier containing (A) to the solvent, (B) the pest control component and part or all of the other components may be added, or the viscosity modifier containing (A) and (B) the pest control component and the other components may be added to the solvent simultaneously. Further, each component may be added in multiple portions. Furthermore, the stirring time, standing time, and timing may be appropriately changed according to the order of adding each component.

[0043] (Usage location) The pest bait agent of the present embodiment can be filled in, for example, a container with at least a part thereof opened, and installed and used in any place such as indoors including a living room, a bedroom, a guest room, a kitchen, an entrance, a toilet, etc., outdoors such as a garden, a veranda, around a pet house, etc.

[0044] (Target pests) The pest bait agent according to the present embodiment is not particularly limited, but can be preferably used, for example, against crawling pests. Examples of crawling pests include cockroaches such as Blattella germanica, Blattella asahinai, Periplaneta fuliginosa; ants such as Monomorium pharaonis, Odontotermes formosanus, Tapinoma melanocephalum, Coptotermes formosanus, Reticulitermes speratus, Reticulitermes flaviceps, Pristomyrmex pungens, Tapinoma sessile; centipedes such as Scolopendra subspinipes mutilans, Scolopendra subspinipes dehaani, Scolopendra subspinipes japonica; slugs; pill bugs; woodlice; millipedes; earwigs, etc. The pest bait agent according to the present embodiment can be preferably used against ants, more preferably against ants having a liquid-absorbing property. The ants having a liquid-absorbing property refer to, for example, ants that prefer sap or fruits. Examples of ants having a liquid-absorbing property include Tapinoma melanocephalum, Coptotermes formosanus, Reticulitermes speratus, Reticulitermes flaviceps, Pristomyrmex pungens, etc.

[0045] (Method for extending the feeding time of the pest bait agent) The present invention also relates to a method for extending the ingestion time of a poison bait for pests by configuring the poison bait for pests as described above to lengthen the ingestion time of the poison bait for pests. That is, the method for extending the ingestion time of the poison bait for pests according to the present embodiment includes blending at least one selected from the group consisting of (A) an acrylate polymer, an isobutylene maleic anhydride copolymer and its salt, and a layered silicate with a poison bait for pests containing a pest control component (B) to adjust the viscosity to 200 to 80,000 cps.

[0046] By blending at least one selected from the group consisting of (A) an acrylate polymer, an isobutylene maleic anhydride copolymer and its salt, and a layered silicate as a viscosity modifier and adjusting the viscosity to the above range, the ingestibility of the poison bait for pests becomes good and the ingestion time can also be extended. By extending the ingestion time of the poison bait for pests, the amount of the poison bait for pests taken into the body of the pests can be increased, and the lethal efficacy is also excellent.

[0047] In the method for extending the ingestion time of the poison bait for pests according to the present embodiment, the poison bait for pests is the same as described above, and the preferred embodiments of at least one selected from the group consisting of (B) a pest control component, (A) an acrylate polymer, an isobutylene maleic anhydride copolymer and its salt, and a layered silicate, and other components that may be further contained are also the same as described above. Also, the preferred range of viscosity, other preferred physical properties, manufacturing method, place of use, target pests, etc. are also the same as described above.

Examples

[0048] The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto.

[0049] <Test Example 1> (Example 1-1) Using ion-exchanged water as a solvent, dinotefuran as a pest control ingredient, granulated sugar as an attractant, and citric acid monohydrate as a pH adjuster were added in the amounts shown in Table 1 and stirred until dissolved. While stirring the resulting solution, a cross-linked product of an acrylic acid / sodium acrylate copolymer was added as a viscosity modifier. The mixture was allowed to stand overnight until the viscosity modifier had completely absorbed the liquid, obtaining the pest poison bait agent of Example 1-1.

[0050] (Examples 1-2, 1-3, Comparative Examples 1-1 to 1-4) Except for changing the type and amount of the component compounded as the viscosity modifier as described in Table 1, pest poison bait agents for each example were obtained in the same manner as in Example 1-1.

[0051] Here, the following products were used as the components described in the table. Cross-linked product of acrylic acid / sodium acrylate copolymer: Aquakeep (registered trademark) 10SH-NF (manufactured by Sumitomo Seika Chemical Co., Ltd.) Cross-linked product of isobutylene / maleic anhydride copolymer sodium salt: KI Gel 201K F2 (manufactured by Kuraray Trading Co., Ltd.) Synthetic hectorite: Laponite RD (manufactured by Rockwood Additives Limited) Modified polyalkylene oxide / nonionic thermoplastic water-absorbing resin: Aquacork (registered trademark) TWB-P (manufactured by Sumitomo Seika Chemical Co., Ltd.) Glucomannan: Propol (registered trademark) ISLB (manufactured by Shimizu Chemical Co., Ltd.) Agar, sodium alginate: Aquadia (registered trademark) G5 (manufactured by Ina Food Industry Co., Ltd.) Amorphous fine powder silica (silylated anhydrous silicic acid): HDK H18 (manufactured by Asahi Kasei Wacker Silicone Co., Ltd.)

[0052]

Table 1

[0053] In the table, "gel-like" indicates that the pest poison bait was in a viscous and fluid liquid state. Also, "granular" indicates that the pest poison bait was an aggregate of granular solids. Each of the granular solids was a non-fluid solid, and the "granular" pest poison bait could not be measured for viscosity by the method described below. "Paste-like" indicates that the freshly prepared pest poison bait was separated into two layers, a viscous part and a liquid part. Since the property was separated into two layers, the viscosity could not be measured by the method described below.

[0054] The following evaluations were performed on the pest poison baits of Examples 1-1 to 1-3 and Comparative Examples 1-1 to 1-4 obtained. The results are shown in Table 2.

[0055] (Feeding evaluation) Calcium carbonate was dispersed in ethanol and applied to the inner wall of a plastic cup with a bottom diameter of 80 mm and a height of 40 mm, and then air-dried. Next, 10 test insects were placed in the plastic cup and acclimated overnight with absorbent cotton containing water. Pristomyrmex punctatus was used as the test insect. Approximately 1 g of the pest poison bait was placed in the plastic cup, and the feeding behavior was visually confirmed and evaluated according to the following criteria. 〇: Ate. ×: Did not eat.

[0056] (Stability evaluation over time) Approximately 1 g of the pest poison bait was filled into a 50 mL glass bottle, capped and sealed, and stored in a constant temperature bath at 50 °C for 1 month. The pest poison bait was taken out, allowed to stand until it reached room temperature, and its appearance was visually confirmed and evaluated according to the following criteria. (Property) ○: The fluidity did not change from immediately after preparation. ×: Water separation or separation occurred. (Color tone) ◎: Did not change from immediately after preparation. ○: Slightly browned. ×: Significantly browned.

[0057]

Table 2

[0058] <Test Example 2> (Examples 2-1 to 2-5, Comparative Example 2-1) Except that the compounding amounts of the respective components were the amounts described in Table 3, pest toxic baits for each example were obtained in the same procedure as in Example 1-1.

[0059]

Table 3

[0060] In the table, "solid state" indicates that the pest toxic bait was a solid without fluidity. The viscosity of the pest toxic bait in "solid state" could not be measured by the method described below.

[0061] For the obtained pest toxic baits of Examples 2-1 to 2-5 and Comparative Example 2-1, the following measurements and evaluations were carried out. The results are shown in Tables 4 and 5.

[0062] (Viscosity measurement) Approximately 500 g of the pest toxic bait was placed in a 500 mL beaker, and the viscosity at a formulation temperature of 25°C was measured. For Examples 2-1 to 2-5, a B-type viscometer (TBV type; manufactured by Toki Sangyo Co., Ltd.) and an M4 rotor were used, and the measurement was carried out at a rotational speed of 60 rpm. For Example 2-6 and Comparative Example 2-1, an R-type viscometer (RB-85 type; manufactured by Toki Sangyo Co., Ltd.) and an M7 rotor were used, and the measurement was carried out at a rotational speed of 50 rpm. However, the viscosity of the pest toxic bait of Comparative Example 2-1 could not be measured under the above conditions. That is, ">80000 cps" in Comparative Example 2-1 of Table 4 means that the viscosity was equal to or higher than the upper limit value (80000 cps) of the measurement under the above conditions.

[0063] (Evaluation of palatability and lethal efficacy) Ten test insects were acclimated in the same procedure as the palatability evaluation in Test Example 1. Pristomyrmex punctatus was used as the test insect. Approximately 1 g of the pest poison bait was placed, and the cumulative number of eaten insects in 3 minutes, that is, the total number of test insects that ate the pest poison bait in 3 minutes, was measured. When the test insect brought its antennae close and put its mouth on the pest poison bait to eat, it was judged as eating. It was left standing at 25°C, the number of dead insects after 24 hours was measured, and the mortality rate was calculated by the following formula. Mortality rate (%) = Number of dead test insects / Total number of test insects × 100 The test was conducted twice and the average value was used (round up the decimal part). Furthermore, the test insects were changed to Monomorium pharaonis and evaluated in the same manner.

[0064] (Evaluation of eating time) Ten test insects were acclimated in the same procedure as the palatability evaluation in Test Example 1. Pristomyrmex punctatus was used as the test insect. Approximately 1 g of the sample was placed, and the time from when any one test insect put its mouth on the sample to start eating until it left the sample and stopped eating was measured. The test was conducted three times and the average value was used. Furthermore, the test insects were changed to Monomorium pharaonis and evaluated in the same manner.

[0065] [Table 4]

[0066] [Table 5]

[0067] <Test Example 3> For Examples 2-1 to 2-5, Comparative Example 2-1, and Reference Example 1 shown below, the following evaluations were performed. (Reference Example 1) As Reference Example 1, a commercially available pest bait agent with a viscosity of 50 cps (Formica Colony Shower Type, manufactured by Earth Pharmaceutical Co., Ltd.) was used.

[0068] (Spillability evaluation) A plastic container (3 cm in length × 2 cm in width × 1 cm in height) was filled with approximately 1 g of the pest bait agents of each Example, Comparative Example, and Reference Example. The spillability of the sample when the container was tilted vertically for 5 seconds was evaluated according to the following criteria. 〇: The sample did not spill. △: The sample began to flow. ×: The sample spilled.

[0069]

Table 6

[0070] From the results of Test Example 1, in Examples 1-1 to 1-3 using a specific viscosity modifier, pest bait agents excellent in palatability and stability over time were obtained. On the other hand, the pest bait agents of Comparative Examples 1-1 to 1-4 were insufficient in palatability or stability over time. Also, from the results of Test Example 2, in the pest bait agents of Examples 2-1 to 2-5 in which the viscosity was adjusted to a preferable range, the palatability was good, the feeding time was long, and a high lethal efficacy was obtained. On the other hand, the pest bait agent of Comparative Example 2-1 had a too high viscosity, resulting in inferior palatability and feeding time. Furthermore, from the results of Test Example 3, the pest bait agents of Examples 2-1 to 2-5 were difficult to spill even when the container was tilted.

Claims

Claim 1 (A) one or more selected from the group consisting of acrylate polymers, isobutylene / maleic anhydride copolymers and salts thereof, and layered silicates, and (B) a pest control ingredient, provided that it does not contain a dihydric alcohol or a trihydric alcohol, A poisonous bait agent for pests for filling a container with at least a part thereof open, having a viscosity of 200 to 15,000 cps. Claim 2 The poisonous bait agent for pests according to claim 1, wherein the pest control ingredient is one or more selected from the group consisting of dinotefuran, imidacloprid, fipronil, and hydramethylnon. Claim 3 The poisonous bait agent for pests according to claim 1 or 2, wherein the poisonous bait agent for pests contains water, and the blending amount of the water in the poisonous bait agent for pests is 30 to 90% by mass. Claim 4 A method for extending the eating time of a poisonous bait agent for pests for filling a container with at least a part thereof open, which comprises blending (A) one or more selected from the group consisting of acrylate polymers, isobutylene / maleic anhydride copolymers and salts thereof, and layered silicates into a poisonous bait agent for pests containing (B) a pest control ingredient, provided that a dihydric alcohol or a trihydric alcohol is not blended and the viscosity is 200 to 15,000 cps.

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