SU677629A3 - Insecticide-acaricide - Google Patents

Description

(54) INSECTIC ACCIDENT

one

This invention relates to insect and tick control chemicals, namely an insecticide-acaricide agent based on a-aryl-p-halogenvinyl dialkyl esters of phosphoric acid.

A known non-pesticide composition containing p, p-dichloro-a (2-bromo-4-chlorophenyl) - vinyl diethyl ether of phosphoric acid 1 as an active substance.

It is also known insectoacaricidal agent containing as an active ingredient p-chloro-a- (2,4-dichlorophenyl) vinyl diethyl phosphoric acid ester and usual additives 2. However, the activity of known compounds is insufficient.

The aim of the invention is to find a new insecticoacaricidal agent with high activity.

This goal is achieved using an agent containing a-aryl-p-halogenvinyl dialkyl phosphate ester of the general formula

where RI is methyl, ethyl; R2 alkyl Cz-Ci, Cs: chlorine, bromine; R4 is hydrogen, chlorine;

Kb, Nb, R - independently of one another denote hydrogen, chlorine or bromine, methyl, methoxy;

X O or S, in the amount of 0.5-99.5%.

The forms of application of the preparations are usual: dusts, concentrates, emulsions, granules, dispersions, solutions, suspensions. They are prepared by conventional methods for the manufacture of pesticide formulations.

The compounds of the formula I are obtained by known methods, for example by reacting the halogen derivatives of phosphoric esters or

Table 1

thiophosphoric acid with suitably substituted acetophenones in the presence of an acid binding substance.

The following acid binding agents are used: tertiary amines, for example, trialkylamines, pyridine, dialkylanilines; inorganic bases, e.g. hydroxides; alkali metal and alkaline earth metal carbonates and bicarbonates.

The reaction is carried out at a reaction temperature between -10 and 100 ° C, in particular between 20-80 ° C, at normal or elevated pressure, and in solvents or diluents. As solvents or diluents, for example, ethers and ester compounds, such as diethyl ether, dipropyl ether, dioxane, dimethoxyethane, tetrahydrofuran; amides, for example K, N-dialkylated carboxylic acid amides; aliphatic, aromatic and halogenated hydrocarbons, in particular benzene, toluene, xylenes, chloroform, chlorobenzene; nitriles, for example acetonitriles; sulfoxides, for example dimethyl sulfoxide; ketones, such as acetone, methyl ethyl ketone.

Thus, the following compounds of formula I are obtained, which are listed in one.

Example 1. Insecticidal gastrointestinal action: Spodoptera littoralis and Heliothis virescens.

The tobacco plants are sprayed with an aqueous emulsion containing 0.05% of the test compound. Eight days after the drying of the applied layer on tobacco plants, caterpillars of the species Spodoptera littoralis or Heliothis virescens are placed in stage LS. Two plants were used for one test compound and one test specimen, and killing was counted 2, 4, 8, 24 and 48 hours after placing the caterpillars on the plants. The tests are carried out at 24 ° C and 60% relative humidity.

As comparative substances take the compound of the formula

H C1

 /

with

C, 11

  ; about - with

dl (A)

The test results are presented in Table. 2

Example 2. Acaricidal action: Rhipicefalus bursa (adults and larvae).

5 are placed into the glass tube.

adults or 50 larvae of ixodid ticks in two test batches and 1-

2 min dipped in 2 ml of an aqueous emulsion containing 100; 50; ten; ten; 1.0; 0.5 or

0.1 ppm of the test compound. Then

the tubes are closed with cotton wool and put them closed with a hole down to emulsion

soaked in cotton wool.

table 2

Counting of destroyed adults was done in 2 weeks, and counting of destroyed larvae after 2 days. Each test was performed twice.

The test results are presented in Table. 3

Table 3

Thus, the proposed compounds have a high insecticoacaricidal activity.

Claims (3)

1. Japanese Patent No. 47-18677, cl. 30F, pub. 05.29.72. 2.Shamshchurin A. A., Krimer M. 3. Physico-chemical properties of pesticides, M., Chem., 1976, item 564.