JPH0267204A - Poison bait agent for exterminating insect pest - Google Patents

Abstract

PURPOSE:To obtain a poison bait agent for exterminating insect pests excellent in stability of an active ingredient, attractant, feeding and insecticidal effects on the insect pests and safety, etc., in handling by tableting a microencapsulated specific insecticidal compound and dextrin as essential principal ingredients. CONSTITUTION:A poison bait agent for exterminating insect pests, obtained by using one or more microencapsulated insecticidal compounds selected from organic phosphorus-based, carbamate-based and pyrethroid-based insecticidal compounds and dextrin as essential principal ingredients and preferably adding a vegetable essential oil in an amount of <=10.0wt.% based on the total weight of the poison bait agent and one or more attractant feeding ingredients selected from saccharides, grain flours, biscuit powder and animal powder thereto and tableting the resultant mixture and especially suitable for exterminating cockroach due to far more improved above-mentioned effects than those of a conventional product without any problems of cracking and disintegrating as the formulation. The amounts of the attractant feeding ingredients based on the total weight of the poison bait agent are <=60.0wt.% saccharides, <=50.0wt.% grain flours, <=50.0wt.% biscuit powder and <=10.0wt.% animal powder.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a poisonous bait for pest control. [Prior Art] Conventionally, poisonous bait for pest control has been available in powder form. It has been marketed. However, powdered poison baits can get on your hands when you use them, scatter and contaminate the surrounding area even after they are placed in a designated place, and are often accidentally ingested by young children or pets. There are a number of issues with consumer handling, especially in terms of safety. Therefore, to solve this problem, for example, tablet-shaped poison baits containing boric acid as a main ingredient are already on the market, but the content of boric acid as an active ingredient is limited in terms of effectiveness against pests, especially cockroaches. 20～
The amount is quite high at around 30%, so tablets containing boric acid cannot be said to be safe for humans, animals, and especially young children.
There have even been cases of infant deaths caused by the use of boric acid-containing tenka powder, and sufficient consideration must be given to the risk of accidents due to the misuse of boric acid.Also, boric acid has a very slow effect on cockroaches. Not only does it take a week or more for the cockroach to die after ingestion, but it also causes symptoms of diarrhea during the process, leading to death. A large amount of soft excrement adheres to the surrounding areas, which is extremely unsanitary, staining building materials such as white walls and cloth materials, and damaging the aesthetic appearance.

On the other hand, in the case of tablet-shaped cockroach baits containing pest control agents other than boric acid, such as organophosphorus insecticides, carbamate insecticides, or pyrethroid insecticides, the efficacy of these active ingredients is Since boric acid is much larger than boric acid, the amount of active ingredient added to the formulation is
Compared to boric acid preparations, only a small amount is required, and it can be said that the safety of the preparation is improved in a favorable direction. However, when tablets are made using the above active ingredients other than boric acid, the unique odor of each active ingredient attracts cockroaches. The tablets are avoided, and as a result, the attraction-feeding effect is poor, and the insecticidal effect is significantly reduced. Furthermore, in preparations containing organophosphorus insecticides or carbamate insecticides as active ingredients, these active ingredients are
Hydrolysis occurs in water bones, and the odor produced by the decomposition not only significantly reduces the eating rate of insecticides as described above, but also reduces the content of the active ingredient itself, making the insecticidal effect less effective. Extremely bad.

Therefore, in Japanese Patent Application No. 62-52498, the inventors proposed microencapsulation of one or more types of insecticidal compounds selected from the group consisting of organophosphorus insecticidal compounds, carbamate insecticidal compounds, and pyrethroid insecticidal compounds. We have disclosed a poisonous bait for pest control made by adding crystalline cellulose to the insecticidal compound and tabletting it. However, when making tablets using crystalline cellulose, excellent attracting and edible ingredients such as animal powder and biscuit powder are added. If this is done, the tablets will crack and cannot be compressed unless the tablets are finely pulverized.Therefore, the addition of R powder and saccharide as edible ingredients has been unavoidable, and the effects have been unsatisfactory.

[Problem to be solved by the invention]

As described above, conventional poisonous baits for controlling pests such as cockroaches are not sufficient in terms of safety for humans and livestock, stability of active ingredients, ability to attract and eat pests, insecticidal effect, and safety in handling. There was a problem, and the challenge was to solve it.

[Means to solve the problem]

above! II! In order to solve the problem, the present invention uses one or more microencapsulated insecticidal compounds selected from the group consisting of organophosphorus insecticidal compounds, carbamate insecticidal compounds, and pyrethroid insecticidal compounds and dextrin. A tabletted poisonous bait for pest control as an essential main ingredient, or in addition to these essential main ingredients, a vegetable essential oil of not more than 10.0% by weight based on the total amount of the poisonous bait, 60
．． 0% by weight or less of sugar, 50.0% by weight or less of cereals, 5
Biscuit flour up to 0.0% by weight and 1000% by weight
This method employs a method of adding one or more attractant and edible ingredients selected from the group consisting of the following animal powders to form a poison bait for pest control that is compressed into tablets. The details will be described below.

First, in this invention, the organophosphorus insecticidal compounds include, for example, carbinphos, chlorpyrifos, chlorpyrifos-methyl, cyanofenphos, cyanophos, diazinon, dichlorvos, fenitrothion, fenthion, malathion, naled, virimiphos-methyl, prothiophos, pyridafenthione, salithion, Examples of carbamate insecticidal compounds include tetrachlorvinphos, trichlorfon, bromophos, propetanephos, etc., and examples of carbamate insecticidal compounds include BPMC, carbaryl, (:
Examples include PMC, ethophenecarb, liver MC, MT-〇, promecarb, SWEP, propoxa-, and pyrethroid insecticidal compounds such as cypermethrin, cyphenotrin, deltamethrin, fenpropathrin, fenvalerate, cabsurin, and permethrin. , phenotrin, propulthrin, resmethrin, sifuetthrin, cyfluthrin, alphamethrin, tralomethrin, flucythrinate, or their geometric and optical isomers. The amount of one or more insecticidal compounds selected from the group consisting of such insecticidal compounds depends on the type of compound and the type of target pest, but it is usually 0 to 0 with respect to the total amount of poison bait. ．．
05 to 7.0% by weight. The microcapsules containing these effective insecticidal compounds in the present invention may be any microcapsules that are coated with a film that has enough physical strength to prevent the microcapsule film from being destroyed when the poison bait is compressed into tablets. Examples of membrane materials for microcapsules include formalin urea resin, polystyrene, polyvinyl acetate, polyacrylonitrile, polyethylene, polybutyl methacrylate, polyisobutylene, polybutadiene, polyarylene polyisocyanate, gelatin, casein, albumin, fibrinogen, Hemoglobin, polyvinylpyrrolidone, carrageenan, sodium alginate, agar, gum arabic,
tragacanth gum, locust bean gum, guar gum,
Carboxymethyl cellulose, polyvinyl sulfonic acid,
Examples include cellulose derivatives, polyvinyl derivatives, starch derivatives, amino acid derivatives, vinylpyridine-acrylic acid copolymers, silicic acid, polyurea, polyurethane, polyamides, polyesters, polycarbonates, polysulfonates, polysulfonamides, and epoxy resins.

Next, examples of dextrin include those obtained by hydrolyzing starch powder of potatoes, sweet potatoes, corn, wheat, rice, etc. using acid, heat, amylase, etc., and the amount used is usually determined in the poison bait. It is 10 to 99% by weight based on the total amount.

Preferred examples of plant essential oils include soybean oil, rapeseed oil, sesame oil, and wheat germ oil. III. Glucose, fructose, lactose, brown sugar, brown sugar, warm sugar, etc. can be listed.
Among them, brown sugar, brown sugar, and brown sugar are preferable.

Examples of fi powders include starch powders such as potatoes, sweet potatoes, and corn, wheat flour, rice flour,
Examples include grain baits such as corn flour, and the amount used is usually 0 to 50.0% by weight based on the total amount of poison bait.
It is. Biscuit powder is made by crushing commercially available biscuits, and the amount used is usually 0% of the total amount of poison bait.
~50.0% by weight. Examples of the animal powder include fish meal, pupa meal, krill meal, and shrimp meal, and the amount used is usually 0 to 10.0% by weight based on the total amount of the poison bait.

In addition, in the poison bait for controlling pests of this invention, antioxidants, preservatives, ingestion prevention agents, bulking agents, and other fragrances to enhance attractivity to pests may be added as necessary. Here, as the antioxidant, for example, erythorbic acid, sodium erythorbate, dibutylhydroxytoluene, dl-α-tocopherol, nordihydroguaiaretic acid, methylhydroxyanisole, propyl gallate, guaiac butter, L-cystine hydrochloride Examples of preservatives include benzoic acid, sodium benzoate, salicylic acid, diphenyl, sorbic acid, potassium sorbate, dehydroacetic acid, sodium dehydroacetate, isobutyl paraoxybenzoate, isopropyl paraoxybenzoate, and paraoxybenzoate. Examples include ethyl acid, butyl paraoxybenzoate, propyl paraoxybenzoate, calcium propionate, and sodium propionate. In addition, as the accidental ingestion prevention agent, for example, capsicum powder, amaranth, amaranth aluminum lake, erythrosin, erythrosin aluminum lake, newcoccin, phloxine, rose bengal, acid red, tartrazine, tartrazine aluminum lake, sunset yellow FCF,
Sunset Yellow PCF Aluminum Lake, Fast Green FCF.

Examples include fast green FCF aluminum lake, brilliant blue FCF, brilliant blue FCF aluminum lake, indigo carmine, indigo carmine aluminum lake, β-carotene, copper chlorophyll, and the like. Examples of the flavor include cheese flavor, butter flavor, peanut flavor, peach flavor, strawberry flavor, milk flavor, and the like. Examples of the filler include white carbon, diatomaceous earth, crystalline cellulose, clay, kaolin, talc, bentonite, zeolite, sepiolite, and attapulgite.

In formulating the above active ingredients and additives added as necessary, there are no particular limitations, but
For example, the insecticidal compound, dextrin, vegetable essential oil, sugar, cereal flour, biscuit flour, animal flour, and other substances may be uniformly mixed and then tableted into any size according to a conventional method.

The poisonous bait of the present invention includes ants such as cockroaches, red ants, and black wood ants, pill bugs, pill bugs, tobacco bugs, and snail bugs;
It can be used as an insect repellent for insect pests such as mealworms such as Physcomitrella sinensis, hirata beetles, and hirata beetles.

Example C] Examples 1 to 6: 0.5% fenitrothion microencapsulated in polyurethane (% is weight %, the same applies hereinafter), dextrin 3
0.0%, dehydroacetic acid 0.1%, and vegetable essential oil, sugar, cereal flour, biscuit flour, and animal flour in the proportions shown in Table 1. After uniformly mixing these substances, a pressure of 15 kg/cj is applied to each tablet, approximately 4 g (diameter approximately 30 cm).
■) was molded into a key to obtain a poisonous bait. The obtained poison bait was evaluated for stability of the active ingredient, attraction effect on cockroaches, and insecticidal effect. The evaluation method is as follows.

■ Tabletability: Applying a pressure of 15 kg/c-, each tablet weighs approximately 4 g (diameter approximately 30-cm).
) There are cracks etc. during tablet forming (×) or (
○) or when kept at 50℃ for 10 days,
Each sample was evaluated in two stages: whether cracking occurred (x) or not (marked O).

■ Stability of active ingredients: After holding the poison bait at 50°C for 10 days, the residual rate of the active ingredient was calculated using gas chromatography, and the residual rate was 80% or more (O mark) and 80%. A two-stage evaluation was performed (marked Cx below the table).

■ Attractive feeding effect: 50 adult German cockroaches in a container with a bottom area of 0.12nf
(equal number of males and females), place the specimen and control bait in it, calculate the attraction rate of the specimen from the number of test insects attracted within a certain time, and mark 80% or more of the attraction rate (+). ), 70-80
% (10 marks) and less than 70% (- marks).

■ Insecticidal effect: 2 hours after eating using the same method as above to increase the feeding effect.
90% or more of mortality rate after 4 hours (++ mark),
A three-level evaluation was performed: 80 to 90% (+ mark) and less than 80% (- mark).

The above evaluation results are summarized in Table 1.

Examples 7 to 1O: Tablets were compressed in exactly the same manner as in Example 1, except that the raw ingredients were blended in the proportions shown in Table 2, and the effects of the obtained poison baits were measured. The results are listed in Table 2.

*I... Comparison of microencapsulation of polyurethane g41-4: Tablets were obtained by performing exactly the same operation as in Example 7-IO except that an insecticidal compound that was not microencapsulated was used. The various effects of poison bait were measured. The results are also listed in Table 2. It is clear from Table 2 that insecticidal compounds that are not microencapsulated are significantly less effective as poisonous baits.

Examples 11 to 16: In addition to the main ingredients, microencapsulated insecticidal compound and dextrin, vegetable essential oil, sugar, biscuit flour,
Animal powder, ingestion prevention agents, flavorings, bulking agents, storage capacity, etc.
The ingredients were blended as shown in the table and tableted in the same manner as in Example 1, and the various effects of the resulting poison bait were measured. The result is the fourth
As summarized in the table, Examples 11 to 16 all showed favorable effects. Furthermore, no cracking or collapse of the tablet molded product was observed.

Comparative Examples 5 to 10: As shown in Table 3, the tablets were compressed in the same manner as in Examples 11 to 16, except that potato starch was used instead of dextrin, which is one of the essential main components. The various effects of the poison baits were investigated, and the results are also listed in Table 4.

As is clear from Table 4, in the poison baits that do not use dextrin (Comparative Examples 5 to 10), the tablet molded product cracks and disintegrates, resulting in poor tabletability, and also has an attractive eating effect and an insecticidal effect. was also found to be inferior.

Table 4 It is far superior to conventional products in terms of attracting and eating effect, insecticidal effect, and handling safety against cockroaches, and there is no problem of cracking or disintegration as a formulation. It is useful as a poisonous bait for controlling pests.

Claims (2)

[Claims] (1) Tablets containing one or more microencapsulated insecticidal compounds selected from the group consisting of organophosphorus insecticidal compounds, carbamate insecticidal compounds, and pyrethroid insecticidal compounds and dextrin as essential main ingredients A poisonous bait for exterminating pests. (2) 10% by weight or less of plant essential oil based on the total amount of poison bait;
One or more types selected from the group consisting of 60.0% by weight or less of sugar, 50.0% by weight or less of cereal flour, 50.0% by weight or less of biscuit flour, and 10.0% by weight or less of animal flour. 2. The poison bait for exterminating pests according to claim 1, wherein an edible attracting ingredient is added to the essential main ingredient and then compressed into a tablet.