JP7222132B2 - Ant control agent - Google Patents

Description

The present invention relates to an ant control agent. More particularly, the present invention relates to an ant control agent containing a specific fatty acid or a salt thereof as an active ingredient, having both a repellent effect and an anticidal effect, and having no fear of withering plants.

In recent years, there has been an increase in bite damage caused by ants that invade homes from outdoors, and ants are also listed as one of the nuisance pests. As a control method, a liquid agent or an aerosol agent containing an insecticidal active ingredient is directly sprayed on the ants to exterminate them, or a poisonous bait is brought back to the ants to the burrows, and the ants in the burrows are killed. The type that exterminates is the mainstream.
For example, liquid formulations and aerosol formulations containing a pyrethroid compound as an insecticidal active ingredient are known to have a rapid insecticidal effect when directly sprayed onto ants or ant nests (for example, patent Reference 1, etc.). In addition, it has been reported that a poison bait containing a phenylpyrazole compound as an insecticidal active ingredient does not exhibit a fast-acting insecticidal effect due to contact action, and ants carry the poison bait into the nest hole and collapse the entire nest. (Patent Document 2). However, since the above-mentioned liquid formulations and aerosol formulations have a rapid insecticidal effect due to their contact action, they cannot exterminate ants that do not come into contact with the insecticidal active ingredient. In addition, depending on the attracting component contained together with the insecticidal component, the above poison bait may show variations in the carrying effect and may not provide a sufficient control effect.
Until now, formulations containing chemically synthesized insecticide ingredients such as pyrethroid compounds and phenylpyrazole compounds have been widely used to exterminate ants. The demand for drugs is also increasing. For example, a long-lasting ant control agent containing a natural essential oil component such as dihydrojasmone as an ant repelling component has been reported (Patent Document 3). However, since the active ingredient is a natural essential oil component, it is highly volatile and its repellent effect does not last long, so a long-term ant control effect cannot be obtained.
Under these circumstances, there is a demand for the development of an agent that has an excellent control effect against ants and that has a reduced burden on the environment, humans and animals.

JP 2003-073216 A JP-A-08-175910 JP 2013-126960 A

An object of the present invention is to provide an ant control agent that has an excellent control effect against ants and that has a reduced burden on the environment, humans and animals.

As a result of extensive research to solve the above problems, the present inventors have found that a drug containing a fatty acid having 12 or more carbon atoms or a salt thereof as an active ingredient has both a repellent effect and an anticidal effect against ants. The inventors have found that the above problems have been solved.

Specifically, the gist of the present invention is as follows.
1. An ant control agent comprising a fatty acid having 12 or more carbon atoms or a salt thereof as an active ingredient.
2. 1. A fatty acid having 12 to 18 carbon atoms or a salt thereof as an active ingredient; The ant control agent described in .

The ant control agent of the present invention has an excellent feature of exerting an ant-repellent effect as well as an ant-killing effect, and has an advantage of reliably achieving the ant control performance. Therefore, the ant control agent of the present invention exerts an anticidal effect by spraying or spraying directly on ants or on ant burrows, and furthermore, the sprayed or sprayed place is repellent to ants. Since it is effective, it can repel ants and inhibit their colonization.
Moreover, since the ant-controlling agent of the present invention is excellent in the persistence of its repelling effect, it is possible to obtain a long-term ant-controlling effect.
Furthermore, the ant control agent of the present invention has the feature of being highly safe for plants in areas where it is sprayed or sprayed, since it does not kill the plants.

1 is a diagram showing an outline of an ant colonization inhibition confirmation test and an ant colonization inhibition durability confirmation test in Examples. FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is the figure which showed the outline|summary of the anticidal activity confirmation test in an Example.

The ant control agent of the present invention will be described in detail below.
The ant control agent of the present invention contains a fatty acid having 12 or more carbon atoms or a salt thereof as an active ingredient, and is effective against various ants. For example, Pleistocene ant, Pleurotus ant, Yellow-eyed ant, Black-eyed ant, Black-eyed ant, Kotobi-irokai ant, Hayashi Tobi-irokoe ant, Yellow-spotted ant, Black-spotted ant, Halybuto-snapped ant, Owashiwa ant, Tobi-iroshiwa ant, Wrinkled ant, Porcupine ant, Mekula ant, Toge ant, Black carpenter ant, Red carpenter ant, Samurai It can be applied to ants, black mountain ants, red mountain ants, black ants, red ants, reticulum ants, ume matsu ants, wrinkled ants, Ezokushi ants, giant ants, red ants, red ants, red ants, long ants, red ants, etc. Can be applied.

The active ingredient of the ant control agent of the present invention is a fatty acid having 12 or more carbon atoms. Specifically, for example, lauric acid (12 carbon atoms), myristic acid (14 carbon atoms), pentadecylic acid (15 carbon atoms), palmitic acid (16 carbon atoms), palmitoleic acid (16 carbon atoms), margaric acid ( 17 carbon atoms), stearic acid (18 carbon atoms), oleic acid (18 carbon atoms), vaccenic acid (18 carbon atoms), linoleic acid (18 carbon atoms), α-linolenic acid (18 carbon atoms), γ-linolene acid (18 carbon atoms), eleostearic acid (18 carbon atoms), arachidic acid (20 carbon atoms), mead acid (20 carbon atoms), arachidonic acid (20 carbon atoms), behenic acid (22 carbon atoms), lignoserine acid (24 carbon atoms), nervonic acid (24 carbon atoms), cerotic acid (26 carbon atoms), montanic acid (28 carbon atoms), melissic acid (30 carbon atoms), and the like.
Further, the salts thereof include sodium salts, potassium salts, calcium salts, magnesium salts, ethanolamine salts, triethanolamine salts, ammonium salts and the like. Alternatively, the fatty acid and the corresponding neutralizing agent may be added separately to form a salt in the ant control agent. For example, fatty acids and triethanolamine or sodium hydroxide as neutralizing agents can be added separately and used as triethanolamine or sodium salts. In the present invention, sodium hydroxide, triethanolamine, ammonia, and potassium hydroxide are suitable as the neutralizing agent.
Among the active ingredients of the ant control agent of the present invention, fatty acids having 12 or more carbon atoms are preferable, and fatty acids having 12 to 18 carbon atoms are more preferable, and lauric acid, myristic acid, palmitic acid, oleic acid, linoleic acid, and linolenic Acids are particularly preferred.
The ant control agent of the present invention preferably contains a fatty acid having 12 or more carbon atoms or a salt thereof as an active ingredient in the range of 0.01% by weight or more and 10% by weight or less based on the total amount of the ant control agent. It is more preferably contained in the range of 05% by weight or more and 5% by weight or less, and more preferably 0.1% by weight or more and 3% by weight or less.

The ant control agent of the present invention is formulated, and examples of formulation types include oil solutions, emulsions, wettable powders, flowable agents (suspensions in water, emulsifiers in water, etc.), microcapsules, and powders. , granules, tablets, gels, liquids, sprays, aerosols and the like. Among them, formulations for atomization such as sprays and aerosols, dusting agents in which liquid agents are filled in a container with a watering can, etc. can maximize the repelling performance and anticidal performance against ants of the present invention. It is suitable as a formulation type.
As one production example, a solution (solution A) is prepared by dissolving a fatty acid having 12 or more carbon atoms or a salt thereof in a solvent using a surfactant, if necessary, and mixing this solution A with an appropriate amount of water, A method of making an ant control agent that does not need to be diluted at the time of use by stirring can be exemplified. As water, tap water, ion-exchanged water, distilled water, filtered water, sterilized water, underground water, and the like are used.

Examples of liquid carriers include alcohols (methanol, ethanol, isopropyl alcohol, butanol, hexanol, benzyl alcohol, ethylene glycol, etc.), ethers (diethyl ether, ethylene glycol dimethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, propylene glycol monomethyl ether, tetrahydrofuran, dioxane, etc.), esters (ethyl acetate, butyl acetate, isopropyl myristate, ethyl lactate, etc.), ketones (acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, etc.), aromatic or aliphatic hydrocarbons ( xylene, toluene, alkylnaphthalene, phenylxylylethane, kerosene, light oil, hexane, cyclohexane, etc.), halogenated hydrocarbons (chlorobenzene, dichloromethane, dichloroethane, trichloroethane, etc.), nitriles (acetonitrile, isobutyronitrile, etc.), Sulfoxides (dimethyl sulfoxide, etc.), heterocyclic solvents (sulfolane, γ-butyrolactone, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, N-octyl-2-pyrrolidone, 1,3-dimethyl-2 -imidazolidinone), acid amides (N,N-dimethylformamide, N,N-dimethylacetamide, etc.), alkylidene carbonates (propylene carbonate, etc.), vegetable oils (soybean oil, cottonseed oil, etc.), vegetable essential oils (orange oil, hyssop oil, lemon oil, etc.), and water.

As surfactants, nonionic surfactants, anionic surfactants, cationic surfactants, and amphoteric surfactants can be used. Nonionic surfactants include, for example, polyoxyalkylene allylphenyl ether, polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether, polyoxyethylene allylphenyl ether, polyoxyethylene styrylphenyl ether, polyoxyethylene alkylphenyl Ether formaldehyde condensate, polyoxyethylene-polyoxypropylene block polymer, polyoxyethylene-polyoxypropylene block polymer alkylphenyl ether, sorbitan fatty acid ester (sorbitan monooleate, sorbitan laurate, etc.), polyoxyethylene fatty acid ester, poly Oxyethylene sorbitan fatty acid esters, polyoxyethylene hydrogenated castor oil, polyethylene glycol fatty acid esters, polyethylene glycol fatty acid ethers and the like can be mentioned. Anionic surfactants include, for example, alkyl sulfates, polyoxyethylene alkyl ether sulfates, polyoxyethylene alkylphenyl ether sulfates, polyoxyethylene benzyl (or styryl)phenyl ether sulfates or polyoxyethylene-polyoxypropylene block polymers. Sodium, calcium or ammonium sulfate salts; alkyl sulfonates, dialkyl sulfosuccinates, alkyl benzene sulfonates (such as calcium dodecylbenzene sulfonate), mono- or di-alkyl naphthalene sulfonates, naphthalene sulfonate formaldehyde condensates, sodium, calcium, ammonium or alkanolamine salts of lignosulfonic acid, polyoxyethylene alkylphenyl ether sulfonic acid or polyoxyethylene alkyl ether sulfosuccinate; - sodium or calcium salts of alkylphenyl ether phosphates, polyoxyethylene benzyl (or styryl) phenyl ether phosphates, polyoxyethylene benzyl (or styryl) phenyl ether phosphates, polyoxyethylene-polyoxypropylene block polymer phosphates, etc. salt. Examples of cationic surfactants include quaternary ammonium salts, alkylamine salts, alkylpyridinium salts, alkyl oxides and the like. Amphoteric surfactants include, for example, alkylbetaines and amine oxides.

Examples of gaseous carriers used for formulation include butane gas, freon gas, alternative freon (such as HFO and HFC), liquefied petroleum gas (LPG), dimethyl ether, carbon dioxide gas, and nitrogen gas. For example, clays (kaolin, diatomaceous earth, bentonite, clay, acid clay, etc.), synthetic hydrated silicon oxide, talc, ceramics, other inorganic minerals (sericite, quartz, sulfur, activated carbon, calcium carbonate, hydrated silica, etc.), porous A substance etc. are mentioned.

Antifreeze agents, antifoaming agents, preservatives, antioxidants, thickeners and the like can be added to the ant control agent of the present invention, if necessary.
Antifreeze agents include, for example, ethanol, ethylene glycol, propylene glycol, ethyl cellosolve, butyl carbitol, 3-methyl-methoxybutanol, and the like.
Examples of defoaming agents include Antifoam E-20 (silicone emulsion, Kao Corporation, trade name), Antifoam C (Dow Corning Toray Co., trade name), Antifoam C emulsion (Dow Corning Toray Co., Ltd., trade name). product name), Rhosil 454 (Solvay, product name), Rhodesil Antifoam 432 (Solvay, product name), TSA730 (Tanak, product name), TSA731 (Tanak, product name), TSA732 (Tanak, product name) product name), silicone antifoaming agents such as YMA6509 (trade name, Tanac Co., Ltd.), and fluorine antifoaming agents such as Fluowet PL80 (trade name, Clariant Co., Ltd.).
Examples of antiseptics include Biohope and Biohope L (chemical name: organic nitrogen-sulfur compound, organic bromine-based compound), Bestcide-750 (chemical name: isothiazoline-based compound, 2.5-6.0%). , Preventol D2 (chemical name: benzyl alcohol mono (poly) hemiformal), PROXEL GXL (S) (chemical name: 1,2-benzisothiazolin-3-one, 20%), 5-chloro-2-methyl-4 -isothiazolin-3-one, 2-methyl-4-isothiazolin-3-one, 2-bromo-2-nitropropane-1,3-diol, potassium sorbate, sodium dehydroacetate and the like.
Antioxidants include tetrakis[methylene-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate]methane (Tominox TT, API Corporation, trade name/IRGANOX1010 or IRGANOX1010EDS, Ciba Japan, trade name), butylated hydroxytoluene (BHT), butylated hydroxyanisole (BHA), propyl gallate, and vitamin E, mixed tocopherols, α-tocopherol, ethoxyquin and ascorbic acid.

The ant control agent of the present invention may be a viscous liquid agent in order to suppress absorption into the soil and exert a sufficient anticidal effect when applied to burrows and their surroundings. In adjusting the viscosity, for example, glycerin, Zamflo, xanthan gum, pectin, gum arabic, guar gum, agar, cellulose and its derivatives, starch and its derivatives, carboxyalkalates, polyacrylates, polymaleates, polyvinyl alcohol, One or two or more of thickeners such as polyvinylpyrrolidone and carboxyvinyl polymer may be used.

In addition, if necessary, within a range that does not inhibit the effects of the present invention, for example, natural pyrethrin, allethrin, resmethrin, flamethrin, prallethrin, terarethrin, phthalthrin, phenothrin, permethrin, cyphenothrin, cypermethrin, transfluthrin, metofluthrin, profluthrin, pyrethroid compounds such as imiprothrin, empenthrin, etofenprox, and silafluofen; carbamate compounds such as propoxor and carbaryl; organophosphorus compounds such as fenitrothion and DDVP; oxadiazole compounds such as methoxadiazone; ; nitroguanidine compounds such as amidoflumet; neonicotinoid compounds such as imidacloprid and dinotefuran; insect juvenile hormone-like compounds such as methoprene and hydroprene; anti-juvenile hormone-like compounds such as precocene; , cinnamon oil, clove oil, and other insecticidal essential oils; synergists such as synepyrine and piperonyl butoxide; However, in consideration of the increased safety consciousness of users, it is preferable that the ant-control liquid agent of the present invention does not contain these insecticidal ingredients and the like in addition to the active ingredient of the present invention.

The ant control agent of the present invention contains 0.01 to 30 g, preferably 0.05 to 25 g, of an active ingredient comprising a fatty acid having 12 or more carbon atoms or a salt thereof per square meter of a place where ants are to be controlled. Good to spread. As for the frequency of treatment, once the occurrence of ants is confirmed, treatment should be performed at a frequency of about once a month. Processing means is not particularly limited.
The ant control agent of the present invention can be used indoors as well as outdoors without any problems. For example, an ant-killing effect can be exerted by spraying or spraying directly on ants or in ant nest holes. Furthermore, the ant control agent of the present invention can be applied to kitchens, back doors, entrances, corridors, living rooms, windowsills, verandas, wood decks, ports, road surfaces such as asphalt, gardens, planters, flowerpots, flower beds, vegetable gardens, lawns, agricultural lands, etc. By spraying or spraying on buildings such as houses or their surroundings, it exhibits excellent ant-killing activity and ant-repellent effect, and not only the ant-control effect after treatment, but also ants for a long time after treatment. It is repellent and can inhibit colonization of ants.
The ant control agent of the present invention has both anticidal activity and ant repelling effect, so that it exhibits an excellent ant control effect without using an insecticidal component in combination, so that it can reliably invade buildings such as houses. It is extremely practical in terms of controlling it.

Hereinafter, the present invention will be described in more detail with formulation examples, test examples, etc., but the present invention is not limited to these examples.
First, an example of a test sample of the ant control agent of the present invention is shown. In the examples, parts means parts by weight unless otherwise specified.
In preparing the test specimens of the following examples and comparative examples, lauric acid, myristic acid, oleic acid, palmitic acid, linoleic acid, caprylic acid, capric acid, polyoxyethylene sorbitan monooleate (Tween 80), and acetone Reagents manufactured by Wako Pure Chemical Industries, Ltd., linolenic acid and pelargonic acid manufactured by Tokyo Kasei Kogyo Co., Ltd., and especially linolenic acid used "α-linolenic acid".

<Confirmation test for inhibition of colonization of ants>
(1) Preparation of test specimen Example 1
Using 2.5 parts by weight of lauric acid (12 carbon atoms) and acetone to make the total amount 100 parts by weight, each component is mixed and stirred with a magnetic stirrer so that the composition becomes uniform to prepare a test sample. bottom.
For Examples 2 to 13 and Comparative Examples 1 and 2, test specimens were obtained in the same manner as in Example 1 with the formulations shown in Tables 1 and 2 below.

(2) Test method for ant repellent activity The outline of the test is shown in FIG.
Calcium carbonate was applied to the upper part of the inner wall surface of a plastic container having a length of 25 cm, a width of 30 cm and a height of 10 cm to prevent the escape of the test insects. Absorbent cotton impregnated with water was placed in two places in the container as feeding grounds for the test insects. Next, filter paper with a diameter of 5.5 cm was impregnated with 2 mL of each test sample, and the filter papers were placed so as to surround one feeding area. As a control, a filter paper with a diameter of 5.5 cm impregnated with 2 mL of acetone was placed so as to surround another feeding area.
Next, test insects (50) were released into the container, and the number of colonies (the number of ants on the filter paper) after 30 minutes was counted, and the repelling rate (%) was calculated by the following formula. The test was performed at 25°C under bright conditions.
[Evasion rate (%) calculation formula]
Repellent rate (%) = {(number of control colonies - number of colonies of test specimens) / (number of colonies of test specimens + number of colonies of control specimens)} x 100
The ant-repellent activity was evaluated on a 4-point scale according to the following evaluation criteria from the repellency rate (%) calculated by the above formula.
[Evaluation criteria]
"◎": Evasion rate: 100%
“○”: repellency rate: 70% or more and less than 100% “●”: repellency rate: 60% or more and less than 70% “×”: repellency rate: less than 60% , judged to be practical as an ant control agent of the present invention.
The composition, repellency rate (%), and repellency evaluation results of the above test specimens are summarized.

As is clear from the results in Tables 1 and 2, fatty acids with 12 or more carbon atoms have a repelling rate of 100% or 70% or more regardless of the types of ants such as black fire ants and mysid ants, and exhibit excellent repelling effects. confirmed. On the other hand, capric acid, which is a fatty acid with 10 carbon atoms, and caprylic acid, which is a fatty acid with 8 carbon atoms, have a repelling rate of less than 60% against black fire ants and short-tailed ants. It became clear that there is a difference depending on the number of carbon atoms.

<Confirmation test for persistence of ant colonization inhibitory effect>
A filter paper with a diameter of 5.5 cm impregnated with 2 mL of each test sample was placed in a fume hood at 25 ° C. for 30 days and air-dried. One hour after the test insects (50) were released, the number of colonies (the number of ants on the filter paper) was counted. The repelling rate (%) was calculated by the above formula and evaluated in four stages according to the above evaluation criteria.
The compositions of the test specimens, the repellency rate (%), and the repellency evaluation results are summarized.

As is clear from the results in Tables 3 and 4, fatty acids with 12 or more carbon atoms have a practical repelling rate of 100% or 60% or more even after 30 days from the treatment, regardless of the type of ants such as Black fire ant and Reticulum ant. It was confirmed that it exhibits a strong repellent effect and has an excellent long-lasting effect of inhibiting colonization in the treated area.

<Anticidal activity confirmation test>
(1) Preparation of test specimen Example 22
2.5 parts by weight of lauric acid (12 carbon atoms), 1.0 parts by weight of "Tween 80" and ion-exchanged water are used to make the total amount 100 parts by weight, each component is mixed and the composition is uniform with a magnetic stirrer. A test sample was prepared by stirring so that
For Examples 23 to 26 and Comparative Example 3, test specimens were obtained in the same manner as in Example 22 with the formulations shown in Table 5 below.

(2) Test method for anticidal activity The outline of the test is shown in FIG.
A plastic cup (trade name: KP-200 (manufactured by Konoike Plastic Co., Ltd.)) having an inner diameter of 100 mm and a height of 45 mm was coated with calcium carbonate on the upper part of the inner wall surface to prevent the escape of the test insects. Five test worms were released into the cup and 3 mL of each test sample was sprayed from a distance of 10 cm. After treatment, the test worms were transferred to clean plastic cups and the time (KT) to knock down all of them was measured. In addition, the number of fatalities was counted after 12 hours, and the fatality rate (%) was calculated by the following formula. The test was performed at 25°C under bright conditions.
[Fatal rate (%) formula]
Mortality rate (%) = number of dead test insects/total number of test insects x 100
Table 5 summarizes the composition of the test specimen, the lethality rate (%) to the black fire ant and the black fire ant, and the time (KT) until the black fire ant is knocked down.

As is clear from the results in Table 5, it was confirmed that the fatty acids having 12 or more carbon atoms have 100% anticidal activity regardless of the type of ants such as Black fire ant and Amyme ant. In addition, the time (KT) to knock down all ants is within 30 seconds for lauric acid, and within 50 seconds for other fatty acids having 12 or more carbon atoms. It was found to have an excellent knockdown effect against genus C. and also to have excellent anticidal activity.

<Safety Confirmation Test for Plants>
(1) Preparation of test specimen Example 27
1.0 parts by weight of lauric acid (12 carbon atoms), 0.3 parts by weight of "Tween 80" and ion-exchanged water are used to make the total amount 100 parts by weight, each component is mixed and the composition is uniform with a magnetic stirrer. A test sample was prepared by stirring so that
For Examples 28 to 31 and Comparative Examples 4 to 6, test specimens were obtained in the same manner as in Example 27 with the formulations shown in Table 6 below.

(2) Confirmation Test Method for Safety of Plant Body Radish seeds were sown in a cell tray of 5 cm square, and the plant body was grown in a temperature-controlled room (20° C.) for 5 days and subjected to the test.
4 mL of each test sample (Examples 27 to 31 and Comparative Examples 4 to 6) having the composition shown in Table 6 was sprayed with a trigger spray. The herbicidal effect was evaluated on a 6-point scale according to the following evaluation criteria from the percentage of discolored or dead area after one day of treatment.
[Evaluation criteria]
"5": 80% or more discoloration or death to 100% death (complete death)
"4": 60% to less than 80% discoloration or death "3": 40% to less than 60% discoloration or death "2": 20% to less than 40% discoloration or death "1": Less than 20% Death "0": No discoloration Table 6 summarizes the composition of the test specimens and the safety evaluation results for the plant body.

As is clear from the results in Table 6, fatty acids having 12 or more carbon atoms do not have the ability to kill plants, unlike pelargonic acid and the like, which are known to have herbicidal activity. confirmed. From this, it was clarified that the ant control agent of the present invention has a feature that it is highly safe to the plant body in the place where it is sprayed or sprayed, and that it does not cause chemical damage.

The ant control agent of the present invention, which contains a fatty acid having 12 or more carbon atoms as an active ingredient, exerts an excellent ant-repellent effect regardless of the type of ants, and has excellent sustainability of the repellent effect. About one month after treatment with the ant control agent of the present invention, it is extremely practical because it inhibits the invasion of ants into structures such as houses and inhibits the establishment of the treated area.
Moreover, the ant control agent of the present invention has an excellent feature of exhibiting an ant-killing effect as well as a repelling effect. That is, the ant control agent of the present invention exerts an anticidal effect by spraying or spraying directly on ants or on ant burrows, and furthermore, the sprayed or sprayed place is repellent to ants. Since it is effective, it can repel ants and inhibit their colonization.
Furthermore, since the ant control agent of the present invention does not kill plants, it has the feature of being highly safe for plants in the treated area.

Claims (4)

A control agent for black wood ant and/or mysid ant, characterized in that it exhibits a repellent effect and an anticidal effect, containing a fatty acid having 12 carbon atoms or a salt thereof as an active ingredient (however, an insecticide containing 12 to 26 carbon atoms) Excludes pest control agents containing a mixture of saturated fatty acid and/or its salt and C6-C14 saturated fatty acid and/or its salt as an emulsifier). A repellent for black wood ants and/or reticulum ants , characterized by containing a fatty acid having 12 carbon atoms or a salt thereof as an active ingredient (provided that the unsaturated fatty acid having 12 to 26 carbon atoms and/or a salt thereof Excludes pest control agents containing mixtures of saturated fatty acids with 6 to 14 carbon atoms and/or salts thereof as emulsifiers). A control agent containing a fatty acid having 12 carbon atoms or a salt thereof as an active ingredient (however, a mixture of an unsaturated fatty acid having 12 to 26 carbon atoms and/or a salt thereof and a saturated fatty acid having 6 to 14 carbon atoms and/or a salt thereof as an emulsifier.) is used to exhibit both repellent and anticidal effects. A repellent containing a fatty acid having 12 carbon atoms or a salt thereof as an active ingredient (however, a mixture of an unsaturated fatty acid having 12 to 26 carbon atoms and/or a salt thereof and a saturated fatty acid having 6 to 14 carbon atoms and/or a salt thereof as an emulsifier.

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