SU288835A1 - Acaricide and insecticide - Google Patents

Description

This invention relates to the use of organophosphorus compounds as acaricides and insecticides. It is known to use as an insecticide and acaricide 0,0-dimethyl-0-4-nifophenylthiophosphate (metaphos). However, this compound is not effective enough as an acaricide. It is proposed to use as acaricides and insecticides O-alkyl-O-aryl-3-alkylthiophosphates of the general formula: where R is Ci-C4 alkyl; R-H- or iso-CzH, C4 Nd; X-C1, CH3 or M02; The p-number is one or 3. These compounds are more active acaricides and insecticides in a number of organophosphorus compounds. They can be obtained by reacting 0-alkyl-O-aryl chlorothiophosphates with the corresponding mercaptans in the presence of hydrogen chloride acceptors. Tests of drugs were carried out according to the standard method. Metaphos was used as a reference. To assess contact acaricides, adult spider mites (Tetranye urticae Koch) were placed on discs cut from the leaves of the beans and processed in 2-3 replicates of the drug emulsion, taken in several concentrations, using a laboratory sprayer. To prevent ticks from running, the disks were placed in Petri dishes on a layer of water. After two days, the number of live and dead ticks was calculated, the death rate was calculated for each drug concentration, and the drug concentration determined by 50% death of ticks (CKso) was determined. Simultaneously, experiments were performed with the reference and untreated control. The systemic effect of the drug was checked by attaching foam rubber tampons impregnated with the drug emulsion onto the stalks of the bean plants. The next day, adult spider mites were placed on the treated plants and three days after the treatment, their death was observed.

When evaluating the insecticidal activity of nparaty on flies Musca domestica prepared water

emulsions of drugs in several concentrations and applied them using a laboratory sprayer on previously anesthetized flies. Accounting for death was carried out in a day. CKso was determined by a known method.

The test results of some 0-alkyl-0-aryl-5-alkylthiophosphates and their properties are given in table. 1, 2 and 3.

As can be seen from the table. 1 data, the most effective drugs number 2, 3 and 4, according to the acaricidal activity, they are standard-metaphos-15-16, and even more than 100 times, and drug 2 also has good systemic activity.

The proposed formulations may be used as such, in the form of dusts, emulsion concentrates, wettable powders, aerosols, or in a mixture with other pesticides.

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Claims (1)

Claims The use of a compound of the general formula RO Oh where R is alkyl with 1-4 atoms of the carbon R is n- or iso-C3H, C4H9; X-C1, CH3 or NOj; n - O, 1 or 3 as an acaricide and an insecticide.