ECOTOXICOLOGICAL MONITORING OF INSEKTICIDES RESIDUES IN PEAR FRUITS

Abstract

Experimental data from two years of research showed the perspective of using insecticides based on acetamiprid, thiacloprid, and aversectin C against pear psylla in the conditions of the Nonchernozem zone. The period of semi-decomposition (T₅₀, days) of acetamiprid ranged from 7 to 22 days, tiakloprid from 8 to 21 days, aversectin C from 2-3 days, depending on air temperature, amount of precipitation and dose of the drug. The decrease in the active substance of insecticides from the fruit of pear occurred as a result of chemical destruction and biological destruction (dilution). The rate of decomposition of aversectin C in pear fruits was maximum and was equal to 0,4894 ± 0,0413 days^-1, compared with acetamipride 0,1042 ± 0,0230 days^-1 and thiacloprid 0,0392 ± 0,0021 days^-1. The use of the studied drugs is hygienically safe. The waiting time of insecticides from the group of neonicotinoids and the natural complex of avermectins in the pear was: acetamiprid up to 3 (7) days., thiacloprid — 1-3 days, aversectin C 2-4 days.