JP2002212011A - Insect pest-attracting poison bait - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insect pest-attracting poison bait sufficiently exhibiting insecticidal property without impairing an attractive performance of bait which is an attractive ingredient by a solvent when the attracting poison bait is formulated from fipronil which is a predetermined agricultural chemical. SOLUTION: This insect pest-attracting poison bait comprises a bait for insect pests as an attracting ingredient and 5-amino-1-[2,6- dichloro-4-(trifluoromethyl)phenyl]-4-[(trifluoromethyl)sulfinyl]-1H-p yrazol-3- carbonitrile (general name: fipronil) dissolved in polyethylene glycol as an active ingredient for killing insects.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a pest attractant poison bait.

[0002]

2. Description of the Related Art 5-Amino-1- [2,6-dichloro-]
4- (trifluoromethyl) phenyl] -4-[(trifluoromethyl) sulfinyl] -1H-pyrazole-
3-carbonitrile (generic name: fipronil) is a phenylpyrazole-based insecticidally active ingredient which is solid at ordinary temperature,
As its physical properties, it is hardly soluble in water and easily soluble in solvents such as ethanol, acetone, toluene and xylene.

[0003] The pests to be controlled by the above-mentioned phenylpyrazole-based pesticidal active ingredients include agricultural pests such as planthoppers, syphilis, weevil, cockroaches, termites, black ants, and the like.
Living environment pests such as flies;

[0004] Also, since fipronil is specified as a deleterious substance, it is necessary to handle so-called "dust-free" so that fine powder does not scatter in the air during the preparation process. It is appropriate to dissolve and mix uniformly to prepare the formulation.

[0005]

However, in the case of formulating an attractant poison bait with fipronil, a solvent which does not inhibit the attraction of the bait and in which the insecticidal component is uniformly dispersed in the formulation has not been found.

That is, as a specific example of a well-known solvent used in the preparation, toluene and solvent kerosene have repellency against pests, and volatile acetone and ethanol are used when fipronil is recrystallized after these solvents are volatilized. However, there is a problem that it becomes uneven in the preparation.

[0007] When a vegetable oil such as corn oil which does not impair the attraction performance as a poison bait is used as a solvent, its solubility in fipronil is low. Is limited.

[0008] Therefore, an object of the present invention is to solve the above-mentioned problems and to formulate an attractant poison bait with fipronil, in which the solvent is a bait as an attractant component (in some cases, it also serves as an excipient). The present invention is to provide a pest attractant bait which does not impair the attracting performance of the harmful insects and exhibits sufficient insecticidal properties.

[0009]

In order to solve the above-mentioned problems, according to the present invention, 5-amino-1- [2,6-dichloro-4- (trifluoromethyl) Phenyl] -4-[(trifluoromethyl) sulfinyl] -1H-pyrazole-3-carbonitrile (generic name: fipronil) is used as an insecticidally active ingredient, and this insecticidally active ingredient is dissolved in polyethylene glycol to produce a pest-inducing poison. It was an agent.

The insect pest-inducing poison bait of the present invention comprising the above-mentioned components is added to polyethylene glycol in addition to living environment pests such as cockroaches, ants, flies and the like, as well as planthoppers, gypsy moths, weevil and the like. Since there is no repellent effect from agricultural pests and the effective concentration of fipronil is relatively low, there is no problem in terms of solubility, and it can be formulated into various dosage forms.

In addition, in a state where polyethylene glycol and fipronil are uniformly dispersed and mixed, there is no pest repellent action, the attraction of the pest bait is not impaired, and the insecticidal effect of the insecticidal component is efficiently exhibited. Become.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The pests to be controlled using the pest-inducing poison bait of the present invention include agricultural pests such as planthoppers, potatoes, weevil and the like, and living environment pests such as cockroaches, termites, black ants and flies.

The bait of the above-mentioned pest to be an attractant component in the preparation may be any substance as long as the pest to be controlled is an edible substance, and is classified or called in terms of functionality such as a so-called attractant, excipient or binder. May contain known substances.

That is, the pest bait according to the present invention includes, for example, sugars such as sugar, cereals such as corn, wheat, barley and the like, plant flour such as starch and cellulose, fish meal, bonito flakes, bone meal, dried meat flour, and the like. It is a known organic substance that is edible by other pests to be controlled.

The 5-amino-1-amino used in the present invention
[2,6-Dichloro-4- (trifluoromethyl) phenyl] -4-[(trifluoromethyl) sulfinyl]
-1H-pyrazole-3-carbonitrile (generic name: fipronil) is a commercially available pesticide, and the CAS No. is 120068-37-3.

Such fipronil has a high insecticidal activity against pests, and the usual concentration for the above-mentioned pests to be controlled is about 1 to 500 rpm, which is lower than that of organophosphorus or carbamate-based pesticidal active ingredients. Since the concentration is low, it can be easily adjusted to the required effective concentration by uniformly mixing a small amount in the preparation.

Polyethylene glycols have a molecular weight of 200 to 10,000 or more depending on polymerization conditions. Liquids have a molecular weight of 100 to 400, semi-solids have a molecular weight of 400 to 600, white soft waxes have a molecular weight of 300 to 1,000, and have a molecular weight of 300 to 1,000.
At 0, a milky white waxy solid is exhibited. However, all are water-soluble due to the hydrophilic property of the ether group, and are soluble in organic solvents containing a large amount of aromatic hydrocarbons, but are insoluble in aliphatic hydrocarbons.

In order to carry out the preparation by dissolving fipronil in such a polyethylene glycol, the properties (molecular weight) of the polyethylene glycol depend on the desired form of the preparation.
And mixing (or kneading) with a stirrer or the like so as to obtain an active ingredient of about 1 to 500 rpm.

[0019]

Examples and Comparative Examples [Example 1, Comparative Examples 1, 2,
3] Fipronil and a solvent were mixed and dissolved so that the composition (parts by weight) shown in Table 1 was obtained, and then sugar, starch and sodium carboxycellulose (hereinafter, CMC-N) were mixed.
Abbreviated as a. ) Is added and mixed uniformly, and finally water 7
A part by weight was added and kneaded to obtain a solid and granular (3 g / particle) attractive poison bait.

In Comparative Example 2, after adding 7 parts by weight of water and kneading the mixture, the ethanol was volatilized to obtain solid (3
g / grain).

In Comparative Example 3, when 7 parts by weight of water was added and kneaded, the mixture was soft and no longer solid, and the possibility of use as a gel agent was examined. Was not obtained.

[0022]

[Table 1]

An insecticidal test was carried out on the obtained attractant poison bait (Example 1, Comparative Examples 1 and 2) by the following method, and the results are shown in Table 2.

[Insecticidal test] A granular (3 g / particle) attractive poison bait was placed in the center of a test container from which 50 German cockroaches were released, and 40 parts by weight of sugar, 58 parts by weight of starch, C
A mixture of 2 parts by weight of MC-Na and 7 parts by weight of water was kneaded, and a nontoxic attracting granule prepared in the same manner as in the example, and an open container containing water were juxtaposed, and the attracting poison bait and the nontoxic attracting granule were arranged. The agent was set so that cockroaches could select and feed, and the number of dead insects after a predetermined elapsed time (3 hours, 5 hours, 7 hours, 24 hours) was counted.

[0025]

[Table 2]

As is clear from the results in Table 2, in Comparative Example 1, the mortality was 13% even after the test time was passed for 24 hours.
And the attractiveness was considered to be poor. Comparative Example 2 also had a higher mortality rate than Comparative Example 1, but the mortality rate was 62% even after 24 hours had passed, and the attractiveness was considered to be insufficient.

On the other hand, in the first embodiment satisfying all the conditions,
It was confirmed that the mortality was already 77% after 5 hours, and that the mortality was 100% after 24 hours.

[0028]

As described above, the present invention provides a pest-inducing poison bait prepared by dissolving a predetermined pesticide, fipronil, in polyethylene glycol as a pest-inducing ingredient, as described above. There is an advantage that the solvent of the component is a pest attractant poisoning bait that does not impair the attraction performance of the bait (which may also serve as an excipient) as the attractant component and that exhibits sufficient insecticidal properties.

Claims (1)

[Claims] Claims: 1. A pest bait as an attractant component, comprising 5-amino-
1- [2,6-dichloro-4- (trifluoromethyl)
A pest-inducing poison bait prepared by dissolving phenyl] -4-[(trifluoromethyl) sulfinyl] -1H-pyrazole-3-carbonitrile in polyethylene glycol.