JPS58203904A - Insecticidal composition - Google Patents

Abstract

PURPOSE:An insecticidal composition for agricultural and gardening control, obtained by blending a specific compound with thiodan, having synergistic action of each insecticidal effect, effective against noxious insects resistant to insecticides, having low toxicity, prolonged effect, immediate insecticidal effect, and improved fatal effect. CONSTITUTION:alpha-Cyano-3 -phenoxybenzyl-2-( 4-chlorophenyl )isovalerate( containing optical isomer of acid side and alcohol side) shown by the formula, capable of being prepared easily and inexpensively, showing high insecticidal activity against various kinds of lepidopeterous larvae, leafhoppers, insects belonging to the genus Deltocephalidae, insects belonging to the genus Aphididae, cockroaches, etc., effective against noxious insects resistant to organophosphorus agent and carbamate-based insecticides, is blended with thiodan ( =6,7,8,9,10,10-hexachloro-1,5,5a,6,9,9a -hexahydro-6, 9-methano-2,4,3-benzodioxathiepin 3-oxide ) to give a mixture, a composition having low toxicity to men and beasts and low environmental pollution.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a-cyano-3-phenoxybenzyl --(
4t-chlorophenyl)isovalerate (hereinafter compound (
1)) and thiodane (6゜7, ni, ?, /θ, /
θ-hexachloro-/.

3, jh, 4. Ri, Ri IL'-At Kisahydro-6°? - Concerning an insecticidal composition containing a mixture of methanol, 2,4t, and J-benzodioxachepine J-oxide (hereinafter referred to as compound), its purpose is to be fast-acting and have low toxicity to humans and animals. The aim is to provide an inexpensive agricultural and horticultural epidemic prevention insecticide that causes less environmental pollution.

In recent years, the practicality of carbamate-based insecticides has become jeopardized as they infect paddy rice planthoppers and planthoppers, spider mites that damage various crops, and livestock.

Therefore, the present inventor has developed a method that is effective against pests that have developed resistance to organophosphorus agents and carbamate insecticides, and is low in toxicity.
As a result of intensive research aimed at developing an insecticide with immediate and residual effects, it was discovered that the above-mentioned mixed composition is an ideal insecticide that satisfies these conditions.

Furthermore, we have obtained new knowledge that the characteristic of this mixed composition is not that the properties of each of the above-mentioned species are added to each other, but that the insecticidal effects of each species work synergistically.

The thiodane contained in the mixed composition of the present invention tends to lack fast-acting properties, has insufficient residual effectiveness, and is insufficiently effective against pests with low resistance to organic phosphorus agents.

On the other hand, the compound (1) contained in the mixed composition of the present invention is a compound having the following structure.

(Contains optical isomers of acid side and alcohol steel.) This compound can be easily and inexpensively produced, and is extremely effective against pests such as larvae of various ptera, planthoppers, leafhoppers, aphids, and cockroaches. It exhibits strong insecticidal activity against insects that have developed resistance to organic phosphorus agents and carbamate insecticides. However, it has poor penetration and is less effective against spider mites and aphids.

By mixing a type of compound with different properties, it was possible to improve the deficiencies of both. Furthermore, it was found that insecticide resistance was eliminated, and that residual efficacy, immediate insecticidal efficacy, and killing efficacy worked synergistically.

The present invention will be explained in detail below using formulation examples and examples, but the present invention is not limited thereto.

In addition, in the following formulation examples, parts represent parts by weight.

Formulation example/emulsion Compound (1) 70 parts, Compound G2-0 parts, Tsurpol 8
Add 70 parts of M-100 (registered trademark of Toho Chemical) and 60 parts of xylene, stir, mix and dissolve to obtain a homogeneous emulsion.

Formulation Example Powder Dissolve 0.2 parts of the compound and a part of the compound in 7 parts of setone and 1 θ part, add 0 g of talc, stir thoroughly in a crusher, mix, and volatilize 7 setsone to form a powder. get.

Formulation Example 3 Wettable powder compound (470 parts, Compound (I2) 3 parts, Toxinol ■-N (Tokuyama Soda registered trademark name) 70 parts, Radiolite L (Showa Kagaku brand name) 111 parts and Tsurupol 39-G (Toho Chemical registered trademark name) Mix 5 parts well to obtain an irrigation agent.

Example / Insecticidal efficacy against organophosphorus agent-resistant strains of apple tree rootworm larvae, which had developed resistance to organic phosphorus agents and were collected from nine fields. The irrigation agent of Formulation Example 3 was diluted with water and sprayed on a 3D turntable. After spraying, the number of fallen and supine insects was observed over time, and the survival and death tests were conducted 1.24 hours later.The zero-surge experiment was repeated three times. The results are shown below.

In addition, compounds (1) and -) were respectively prepared into aquariums according to Preparation No. 3, and compared.

Example - Effectiveness rate Jk/θ~7 in the field against Chinese cabbage pests
．． Dilute the emulsion in formulation example/with water on Chinese cabbage that has grown to the two-leaf stage,
The seeds were sprayed in the following manner, and after one week of spraying, j plants were removed from each plot and the density of each pest was investigated.

Cultivar Ni Chinese cabbage plot: 7 plots 6-3 repeated spraying: The results of spraying with a hand blower to achieve I301//θa are shown in the table below.

In addition, emulsions of compounds (1) and -) were prepared according to the formulation example, and compared.

* Regarding green caterpillars and armyworms, the total number of insects in the three areas is shown, and for false radish aphids, [-: Not observed at all.

~+: Fairly recognized. ” criteria.

Claims (1)

[Claims] α-cyano-3-phenoxybenzyl --<tit-
An insecticidal composition comprising a mixture of (chlorophenyl)isovalerate and thiodane.