JP6878097B2 - How to improve the eating habits of pest control baits - Google Patents

Description

The present invention relates to a method for improving the eating habitability of a pest control bait, and specifically to a method for improving the eating habitability when a pest eats a pest control bait.

Conventionally, as one of the methods for controlling pests, a pest control bait such as a poison bait has been used. Insecticides are ingested by pests and killed by ingesting insecticidal components. Therefore, it is being studied to add a component that enhances attractiveness and eating habits to the poison bait.

For example, in Ogata et al.'S research (Non-Patent Document 1) or Tsuji's research (Non-Patent Document 2), potatoes, onions, okara, rice bran, various fatty acids, etc. are mentioned as components highly attracting to cockroach and the like. , These attractivenesses are compared.

Further, Patent Document 1 discloses that vanillin, piperonal and the like are attractive to cockroaches, crickets, grasshoppers, grasshoppers, mantis, Diestrammena aureus and the like.

Further, Patent Document 2 discloses that sugar is added to improve the edible property of the poison bait, and examples of sugar include sucrose, glucose, fructose, lactose, brown sugar, brown sugar, and sanon tou. ..

Special Publication No. 54-11367 Japanese Unexamined Patent Publication No. 1-224307

Ogata et al., Sanitary animals, 13 (4), 262 (1962) Tsuji, Sanitary Animals, 17 (2), 89 (1966)

However, the effects of the above-mentioned various ingredients that enhance the edible property of the prior art are not yet sufficient, and therefore, it is necessary to add them in a high concentration in the formulation, which limits the manufacturing suitability and other ingredients, and manufactures them. There is a problem in terms of cost.

Therefore, it is an object of the present invention to provide a new method for improving the edible property of a pest control bait, which can easily improve the edible property of pests and obtain an excellent pest control effect at low cost. ..

The present inventor has made extensive studies. As a result, they have found that the above problems can be solved by adding water having a specific hardness to the bait in order to increase the amount of food consumed by the pest control bait, and have completed the present invention. ..

That is, the present invention is achieved by the following (1) and (2).
(1) A method for improving the eating habitability of a pest control bait, which comprises adding soft water to the pest control bait.
(2) A pest control bait containing an active ingredient for pest control and water, wherein the calcium content concentration with respect to water contained in the pest control bait is 50 mg / L or less and the magnesium content concentration is 5 mg / L. A pest control bait characterized by:

It is known that pests need to ingest water for life support. However, there is no prior art related to the relationship between the type of water and the eating habits of pests.
In the method of the present invention, by adding soft water to the pest control bait, the eating property of the pest is remarkably improved, and an excellent pest control effect can be obtained. In addition, water is extremely low in cost and is extremely advantageous in terms of manufacturing cost. Furthermore, water is odorless, highly safe and easy to handle, does not affect the odor of other components, and does not bother the odor during use.
The pest control bait of the present invention has a calcium content of 50 mg / L or less and a magnesium content of 5 mg / L or less with respect to water contained in the bait, so that the pests are edible. It is improved and the effect of the pest control active ingredient can be effectively obtained.

It is a graph which shows the amount of eating by the German cockroach of Example 1 and Comparative Example 1 in Test Example 1. It is a graph which shows the amount of eating by the German cockroach of Example 2 and Comparative Example 2 in Test Example 2. It is a graph which shows the amount of eating by the German cockroach of Example 3 and Comparative Example 3 in Test Example 3. It is a graph which shows the amount of eating by the German cockroach of Example 4 and Comparative Example 4 in Test Example 4. It is a graph which shows the amount of eating by the German cockroach of Example 5 and Comparative Example 5 in Test Example 5. It is a graph which shows the total number of eating heads of the primate of Example 6 and Comparative Example 6 in Test Example 6. It is a graph which shows the amount of eating by the German cockroach of Example 7 and Comparative Example 7 in Test Example 7.

Hereinafter, the present invention will be described in more detail.

The method for improving the eating habitability of the pest control bait of the present invention is characterized in that the pest control bait contains soft water. By including soft water in the pest control bait, its action is not clear, but since the pest's eating habitability can be improved, the pest control active ingredient can be efficiently ingested.

In the present invention, the hardness is defined by the American hardness, and the total amount of calcium and magnesium contained in water is indicated by a value (mg / L) converted into the amount of calcium carbonate. Specifically, the hardness (mg / L) is calculated by the formula of calcium (mg / L) × 2.5 + magnesium (mg / L) × 4.1. Further, in the present invention, soft water is defined as soft water having a hardness of 120 mg / L or less according to the standards set by the World Health Organization (WHO).

The soft water used in the present invention is more preferably 100 mg / L or less in hardness, and further preferably 50 mg / L or less in hardness, from the viewpoint of further enhancing the eating habitability of pests.

The content of soft water may be appropriately adjusted depending on the form of the pest control bait (bait), and is not particularly limited. The soft water can be contained in the pest control bait in the range of 0.1 to 99.9% by mass, for example. The soft water is preferably contained in an amount of 10% by mass or more, more preferably 50% by mass or more in the pest control bait. The upper limit is preferably 98% by mass or less, more preferably 95% by mass or less. If the content is in the above range, the eating habitability of the pest can be further enhanced.

As a method of adding soft water to the pest control bait, a known method can be used, and examples thereof include a method of mixing with a pest control active ingredient and other prescription ingredients. Specific examples thereof include a method of adding and mixing each component under stirring, a method of stirring and mixing each component under heating, and the like.

In the present invention, the content of calcium and magnesium with respect to water contained in the pest control bait is such that the calcium content concentration is 50 mg / L or less and the magnesium content concentration is 5 mg / L or less. The eating habitability of pests can be improved by adjusting the compounding components so that the content concentrations of calcium and magnesium are within the above ranges. The concentration of calcium and magnesium can be adjusted by adding soft water to the pest control bait as described above, which is preferable.

The contents of water, calcium and magnesium in the pest control bait can be measured by a known method. The content of water in the pest control bait can be measured using various measuring instruments such as coulometric titration, volumetric titration, heat drying method, distillation method and the like. In addition, the content of calcium and magnesium in the pest control bait can be measured using various measuring instruments such as chelatometric titration and atomic absorption spectroscopy. This makes it possible to calculate the concentration of calcium and magnesium in the water contained in the pest control bait.

The pest control bait of the present invention contains at least the pest control active ingredient and water.

Examples of the pest control active ingredient contained in the pest control bait include an insecticidal component.
Insecticide components include, for example, insecticidal chrysanthemum extract, natural pyrethrin, prarethrin, imiprothrin, phthalthrin, alesulin, transfluthrin, resmethrin, phenotrin, ciphenotrin, permethrin, cypermesulin, etofenprox, sifluthrin, deltamesrin, bifenthrin, fenvale Pyrethroid compounds such as propasulin, metoflutrin, profluthrin; organic phosphorus compounds such as fenitrothione, diazinone, marathon, pyridafenthion, prothiophos, hoxime, chlorpyriphos, dichlorvos; carbamate compounds such as carbalyl, propoxul, mesomil, thiodicalbu; Oxaziazole-based compounds; Sulfonamide-based compounds such as amidoflumeth; Phenylpyrazole-based compounds such as fipronil and pyriprol; Amidinohydrazone-based compounds such as hydramethylnone; Oxadiazine compounds such as indoxacarb; insect growth control compounds such as metoprene, hydroprene, pyriproxyfen; insecticidal essential oils such as peppermint oil; boric acid, borosand, chlorphenapir, isomers or derivatives thereof, pipette Examples thereof include synergists such as Ronyl butoxide, Sinepyrin 500, and Sinepyrin 222. These insecticidal components may be used alone or in combination of two or more.

The pest control active ingredient is preferably contained in the pest control bait in the range of 0.001 to 90% by mass, and more preferably in the range of 0.01 to 50% by mass.

As the water, the above-mentioned soft water is preferably used, and the preferable hardness and the content in the pest control bait are also the same.

Other components that can be contained in the pest control bait include, for example, dietary components, attracting components, solvents, and the like.

The dietary component means a dietary / attracting component capable of attracting and feeding pests, for example, sugars, fats and oils, starches, proteins, amino acids, animal and plant extracts, etc. Higher alcohols and the like can be used.
Dietary components include, for example, sugars such as fruit juice, honey, waste sugar honey, multitose, xylitol, sorbitol, heterosexual fructose, citrus sugar, sugar millet, sugar, palatinose, trehalose, lactose; Substances derived from butterflies, moths, flies, oysters, sanagiko, fish, livestock, shellfish, eggs, etc .; substances derived from peanuts, pumpkin seeds, wheat bran, flour, corn, soybeans, soybeans, etc .; wood wax, palm oil , Cacao oil, castor oil, olive oil, peanut oil, soybean oil, corn oil, rapeseed oil, sesame oil, cotton seed oil, flaxseed oil, millet oil, hemp seed oil, eno oil, butter fat obtained from mammals, whale oil, dolphin oil, Squid oil, herring oil, cod liver oil, shark liver oil, microbial fats and oils, fats and oils from yeast, bacteria and the like; edestin, zein, gliadin and the like can be mentioned. As the dietary component, one kind may be used alone or two or more kinds may be used in combination.

The dietary component may be contained in the pest control bait in an amount of 1 to 90% by mass, preferably 10 to 50% by mass. These dietary components may also be used as preforms.

As the attracting component, for example, flavors, extracts, pheromones and the like can be used.
Attracting ingredients include, for example, onion flavor, maple flavor, chicken extract, beef extract, pork extract, milk, soy sauce, Worcestershire sauce, periplanone compounds, trialkylamine salts, alkylamines, cockroach manure, eggs and dried products, methylcyclo. Examples thereof include pentenolone, vanillin, maltol, and methyl maltol. As the attracting component, one type may be used alone or two or more types may be used in combination.

The attracting component may be contained in the pest control bait in an amount of 0.1 to 20% by mass, preferably 1 to 10% by mass.

As the solvent, for example, an organic solvent, a surfactant, an animal oil, a vegetable oil or the like can be used.
Examples of the solvent include organic solvents such as ethanol, glycerin and propylene glycol; surfactants such as polyoxyethylene sorbitan fatty acid ester, polyoxyethylene castor oil and glycol derivatives; lactic acid esters such as ethyl lactate and methyl lactate; N- Examples thereof include N-alkylpyrrolidone such as methylpyrrolidone. As the solvent, one type may be used alone or two or more types may be mixed and used.

The solvent may be contained in the pest control bait in an amount of 0.01 to 90% by mass, preferably 0.1 to 50% by mass.

Further, the pest control bait may be blended with an antioxidant, a preservative, an accidental ingestion inhibitor, a pigment, a flavor, a pH adjuster and the like, if necessary. These may be contained in the pest control bait so as to be 0.001 to 10% by mass, preferably 0.01 to 5% by mass, respectively.
Examples of the antioxidant include erythorbic acid and its salt, dibutylhydroxytoluene, dl-α-tocopherol, nordihydroguayaletic acid, methylhydroxyanisole, propyl gallate, guayaku fat, L-cysteine salt and the like. .. Examples of the preservative include benzoic acid and its salt, salicylic acid, diphenyl, sorbic acid and its salt, dehydroacetic acid and its salt, parahydroxybenzoic acid ester, sodium propionate, potassium propanoate, phenoxyethanol and the like. Examples of the accidental ingestion preventive agent include bitterness components and pungent components such as denatonium benzoate and capsicum powder. Examples of the pigment include tar-based pigments such as Yellow No. 4, Red No. 102, and Blue No. 1, pigments such as caramel, cheese flavors, butter flavors, peanut flavors, peach flavors, strawberry flavors, milk flavors, and the like. Examples of the pH adjuster include citric acid, hydrogen phosphate and the like.

Inorganic substances such as white carbon, diatomaceous earth, clay, kaolin, talc, bentonite, and silica; paraffin, polyethylene glycol, dextrin, styrene resin, and silicone resin, as long as they do not inhibit the attraction and feeding of pests. , Crystallized cellulose, agar, gelatin and other organic substances may be blended with one or more.

The pest control bait of the present invention has a calcium content of 50 mg / L or less and a magnesium content of 5 mg / L or less with respect to water contained in the bait. When the calcium content and the magnesium content are within the above ranges, the appetite of the pest is promoted and the eating habitability can be improved.
The calcium content concentration and the magnesium content concentration with respect to the water contained in the pest control feed are preferably such that the calcium content concentration is 45 mg / L or less and the magnesium content concentration is 4.5 mg / L or less, and the calcium content concentration is More preferably, it is 20 mg / L or less and the magnesium content concentration is 3.5 mg / L or less. The lower limit of the calcium content and the magnesium content is not particularly limited.
As described above, the content of calcium and magnesium in water contained in the pest control bait can be measured by using various measuring instruments such as chelatometric titration and atomic absorption spectroscopy.

In order to obtain a bait having a calcium content of 50 mg / L or less and a magnesium content of 5 mg / L or less with respect to water contained in the pest control bait, soft water having a desired hardness may be used as the water. preferable.

Various types of pest control feeds include, for example, solid, soft solid (for example, jam, gel), elastic solid (for example, gummy), liquid, viscous liquid, granule, and powder. It can be used as a preparation.

Above all, the pest control bait is preferably in a liquid form because the calcium content concentration and the magnesium content concentration with respect to the water contained in the bait can be easily adjusted.
In the case of a liquid pest control bait, the content of water in the pest control bait is preferably 5 to 99.9% by mass, more preferably 30 to 98% by mass, and 50 to 95% by mass. Is more preferable.

As described above, the pest control bait of the present invention contains at least the pest control active ingredient and water, and the calcium content concentration with respect to the water contained in the bait is 50 mg / L or less and the magnesium content concentration is 5 mg. It is less than / L, and according to such a pest control bait of the present invention, the eating property of pests is improved, and an excellent pest control effect can be obtained.

The pest control feed of the present invention can be suitably applied to cockroaches such as the German cockroach, flies, mosquitoes, nukaka, ants, mucades, millipedes, pill bugs, woodlouse, termites and the like. Among them, cockroaches and ants are preferable, and German cockroaches and primate are more preferable.

Further, when using the pest control bait of the present invention, a carrier such as cotton wool or sponge may be impregnated in the habitat or activity area of the pest, or the pest may be stored in a container or a trap and installed.

Hereinafter, the present invention will be further described with reference to Examples and Comparative Examples, but the present invention is not limited to the following examples.

<Test Example 1>
(Example 1)
A bait (aqueous solution) consisting of 5% by mass of sucrose and 95% by mass of soft water (commercially available mineral water: hardness 28 mg / L) was prepared. The calcium content concentration with respect to the water contained in the feed was 6.2 mg / L, and the magnesium content concentration was 3.3 mg / L.

(Comparative Example 1)
A bait (aqueous solution) consisting of 5% by mass of sucrose and 95% by mass of hard water (commercially available mineral water: hardness 304 mg / L) was prepared. The calcium content concentration with respect to the water contained in the feed was 80.0 mg / L, and the magnesium content concentration was 26.0 mg / L.

(Test method)
A shelter (5 cm x 15 cm bellows) and 10 g of water were placed in a bat measuring 40 cm in length x 25 cm in width x 20 cm in height, and 50 German cockroaches (25 males and 25 females each) were placed in the shelter for two days. It was left to stand and the German cockroach was settled in the shelter.
Subsequently, 5 g of the baits of Example 1 and Comparative Example 1 were impregnated with cotton wool of 4 cm × 4 cm, respectively, placed in a dish-shaped container made of φ6 cm plastic, and juxtaposed in a vat. The German cockroach was allowed to eat the food freely, and after 3 hours had passed, the mass of the remaining food was measured.
In addition, in order to correct the error of mass measurement due to moisture absorption and drying of the bait during the test period, the above test was performed under the same conditions without using the German cockroach as a control, and the mass of the bait was measured before and after the test.

The amount of German cockroach eaten was calculated by the following formula (1).
Eating amount (g) = A1 × (B1 / B2) -A2 ... (1)
(In the formula (1), A1 is the mass of the bait before the test (g), A2 is the mass of the bait after the test (g), B1 is the mass of the control bait after the test (g), and B2 is. The mass (g) of the control bait before the test.)

The test was performed three times, and the average value was calculated. The results are shown in Table 1 and FIG.

From the results of Table 1 and FIG. 1, Example 1 using soft water showed an amount of food consumed (average) of the German cockroach three times higher than that of Comparative Example 1 using hard water.

<Test Example 2>
Using the baits of Example 2 and Comparative Example 2, in Test Example 1, the colonization time of the test insects in the shelter was changed from 2 days to 3 days.

(Example 2)
A bait (aqueous solution) consisting of 5% by mass of sucrose and 95% by mass of soft water (commercially available mineral water: hardness 28 mg / L) was prepared. The calcium content concentration with respect to the water contained in the feed was 6.2 mg / L, and the magnesium content concentration was 3.3 mg / L.

(Comparative Example 2)
A bait (aqueous solution) consisting of 5% by mass of sucrose and 95% by mass of hard water (commercially available mineral water: hardness 1468 mg / L) was prepared. The calcium content concentration with respect to the water contained in the feed was 468.0 mg / L, and the magnesium content concentration was 74.5 mg / L.

(Test method)
A shelter (5 cm x 15 cm bellows) and 10 g of water were placed in a bat measuring 40 cm in length x 25 cm in width x 20 cm in height, and 50 German cockroaches (25 males and 25 females) were placed in the shelter for 3 days. It was left to stand and the German cockroach was settled in the shelter.
Subsequently, 5 g of the baits of Example 2 and Comparative Example 2 were impregnated with cotton wool of 4 cm × 4 cm, respectively, placed in a dish-shaped container made of φ6 cm plastic, and juxtaposed in a vat. The German cockroach was allowed to eat the food freely, and after 3 hours had passed, the mass of the remaining food was measured.
In addition, in order to correct the error of mass measurement due to moisture absorption and drying of the bait during the test period, the above test was performed under the same conditions without using the German cockroach as a control, and the mass of the bait was measured before and after the test.

The amount of German cockroach eaten was calculated by the above formula (1). The test was performed three times, and the average value was calculated. The results are shown in Table 2 and FIG.

From the results of Table 2 and FIG. 2, the amount of food consumed by the German cockroach (average) in Example 2 using soft water was about 3.8 times higher than that in Comparative Example 2 using hard water. ..

<Test Example 3>
(Example 3)
A bait (aqueous solution) consisting of 5% by mass of sucrose and 95% by mass of soft water (commercially available mineral water: hardness 40 mg / L) was prepared. The calcium content concentration with respect to the water contained in the feed was 10.0 mg / L, and the magnesium content concentration was 3.0 mg / L.

(Comparative Example 3)
A bait (aqueous solution) consisting of 5% by mass of sucrose and 95% by mass of hard water (commercially available mineral water: hardness 143 mg / L) was prepared. The calcium content concentration with respect to the water contained in the bait was 41.0 mg / L, and the magnesium content concentration was 10.0 mg / L.

(Test method)
The German cockroach eating test was carried out by the same method as in Test Example 2, and the amount of eating was calculated. The test was performed three times, and the average value was calculated. The results are shown in Table 3 and FIG.

From the results of Table 3 and FIG. 3, the amount of food consumed by the German cockroach (average) in Example 3 using soft water was about 1.9 times higher than that in Comparative Example 3 using hard water. ..

<Test Example 4>
(Example 4)
A bait (aqueous solution) consisting of 5% by mass of sucrose and 95% by mass of soft water (commercially available mineral water: hardness 40 mg / L) was prepared. The calcium content concentration with respect to the water contained in the feed was 10.0 mg / L, and the magnesium content concentration was 3.0 mg / L.

(Comparative Example 4)
A bait (aqueous solution) consisting of 5% by mass of sucrose and 95% by mass of hard water (commercially available mineral water: hardness 1468 mg / L) was prepared. The calcium content concentration with respect to the water contained in the feed was 468.0 mg / L, and the magnesium content concentration was 74.5 mg / L.

(Test method)
The German cockroach eating test was carried out by the same method as in Test Example 2, and the amount of eating was calculated. The test was performed three times, and the average value was calculated. The results are shown in Table 4 and FIG.

From the results of Table 4 and FIG. 4, the amount of food consumed by the German cockroach (average) in Example 4 using soft water was about 2.8 times higher than that in Comparative Example 4 using hard water. ..

<Test Example 5>
(Example 5)
A bait (aqueous solution) consisting of 5% by mass of sucrose and 95% by mass of soft water (commercially available mineral water: hardness 119 mg / L) was prepared. The calcium content concentration with respect to the water contained in the feed was 40.8 mg / L, and the magnesium content concentration was 4.3 mg / L.

(Comparative Example 5)
A bait (aqueous solution) consisting of 5% by mass of sucrose and 95% by mass of hard water (commercially available mineral water: hardness 1468 mg / L) was prepared. The calcium content concentration with respect to the water contained in the feed was 468.0 mg / L, and the magnesium content concentration was 74.5 mg / L.

(Test method)
The German cockroach eating test was carried out by the same method as in Test Example 2, and the amount of eating was calculated. The test was performed three times, and the average value was calculated. The results are shown in Table 5 and FIG.

From the results of Table 5 and FIG. 5, Example 5 using soft water showed an amount of food consumed (average) of German cockroach about 1.7 times higher than that of Comparative Example 5 using hard water. ..

<Test Example 6>
An eating test was conducted using Ami Mary as a test insect.

(Example 6)
A bait (aqueous solution) consisting of 5% by mass of sucrose and 95% by mass of soft water (commercially available mineral water: hardness 40 mg / L) was prepared. The calcium content concentration with respect to the water contained in the feed was 10.0 mg / L, and the magnesium content concentration was 3.0 mg / L.

(Comparative Example 6)
A bait (aqueous solution) consisting of 5% by mass of sucrose and 95% by mass of hard water (commercially available mineral water: hardness 1468 mg / L) was prepared. The calcium content concentration with respect to the water contained in the feed was 468.0 mg / L, and the magnesium content concentration was 74.5 mg / L.

(Test method)
Twenty primates as test insects were placed in a plastic cup having a diameter of φ6 cm and a height of 4 cm and left for one day to acclimatize the primates into a plastic cup.
Subsequently, 0.5 g of the bait of Example 6 and Comparative Example 6 was impregnated with 1 cm × 1 cm of cotton wool and juxtaposed in a plastic cup. The primate was allowed to freely eat the food, observed for 5 minutes, and the number of animals eating the food of each example was counted every 1 minute to calculate the total number of animals eaten.
The test was carried out four times, and the average value was calculated. The results are shown in Table 6 and FIG.

From the results of Table 6 and FIG. 6, the total number of primate squirrels (average) of Example 6 using soft water was about 2.8 times that of Comparative Example 6 using hard water, and that of Example 6 Was found to be highly edible.

<Test Example 7>
An eating test was conducted on a poison bait containing an active ingredient for pest control (dinotefuran).

(Example 7)
A poison bait (aqueous solution) consisting of 5% by mass of sucrose, 94.95% by mass of soft water (commercially available mineral water: hardness 40 mg / L) and 0.05% by mass of dinotefuran was prepared. The calcium content concentration with respect to the water contained in the feed was 10.0 mg / L, and the magnesium content concentration was 3.0 mg / L.

(Comparative Example 7)
A poison bait (aqueous solution) consisting of 5% by mass of sucrose, 94.95% by mass of hard water (commercially available mineral water: hardness 1468 mg / L) and 0.05% by mass of dinotefuran was prepared. The calcium content concentration with respect to the water contained in the feed was 468.0 mg / L, and the magnesium content concentration was 74.5 mg / L.

(Test method)
A shelter (5 cm x 15 cm bellows) and 10 g of water were placed in a bat measuring 40 cm in length x 25 cm in width x 20 cm in height, and 50 German cockroaches (25 males and 25 females) were placed in the shelter for 3 days. It was left to stand and the German cockroach was settled in the shelter.
Subsequently, 5 g of the baits of Example 7 and Comparative Example 7 were impregnated with cotton wool of 4 cm × 4 cm, respectively, placed in a dish-shaped container made of φ6 cm plastic, and juxtaposed in a vat. The German cockroach was allowed to freely eat the poison bait, and after 1 hour, the mass of the remaining poison bait was measured.
In addition, in order to correct the error of mass measurement due to moisture absorption and drying of the poison bait during the test period, the above test was performed under the same conditions without using the German cockroach as a control, and the mass of the poison bait was measured before and after the test.

The amount of German cockroach eaten was calculated by the above formula (1). The test was performed three times, and the average value was calculated. The results are shown in Table 7 and FIG.

From the results of Table 7 and FIG. 7, Example 7 using soft water showed an amount (average) four times higher than that of Comparative Example 7 using hard water, and the amount of food consumed by the German cockroach was four times higher than that of the poison bait. It was found that a more remarkable effect can be obtained when this is done.
It was found that almost all German cockroaches were knocked down after 1 hour, and the effect of the active ingredient was also obtained.

Claims (2)

A method for improving the eating habitability of a pest control bait, which comprises containing soft water having a hardness of 28 to 120 mg / L in the pest control bait. A pest control bait containing an active ingredient for pest control and water.
The water contains calcium and magnesium, and the pest control bait is characterized in that the calcium content with respect to the water is 50 mg / L or less and the magnesium content is 5 mg / L or less.

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