Lethal effects of insecticides of emamectin, spinosad, buprofezin and imidacloprid on egg and third instar nymphs of Trialeurodes vaporariorum West. and it’s parasitoid (Encarsia formosa Gahan)

Document Type : Research Paper

Authors

1 Department of Plant Protection, Mahabad Branch, Islamic Azad University, Mahabad, Iran

2 Department of Plant Protection, Urmia University, Urmia, Iran

Abstract

Whitefly (Trialeurodes vaporariorum West.) as a polyphage greenhouse pest with a large number of generations is one of the most important crop and greenhouse pests. In this study, the toxicity of emamectin, spinosad, buprofezin and imidacloprid on greenhouse whitefly and parasitoid wasps Encarsia formosa was investigated. The LC50 values obtained from the probit analysis of bioassay data as a result of the effect of different concentrations of emamectin, spinosad, buprofezin and imidacloprid on 3rd nymph stage of greenhouse whitefly after 24, 48 and 72 hours were (1.72, 1.33, 1.31 and 0.63), (1.40, 1.31, 1.27 and 0.44) and (1.15, 1.04, 0.93 and 0.31) ml L-1, respectively. According to these results, the most effective insecticide on 3rd nymph of whitefly was imidacloprid during 24, 48 and 72 hours and the least effective insecticide was emamectin. The results of analysis of variance and comparison of mean mortality due to treatments of emamectin, spinosad, buprofezin and imidacloprid on E. formosa after 5 days showed that buprofezin was the least dangerous and imidacloprid was the most dangerous insecticide for this natural enemy.Therefore, in integrated management of this pest, due to the ineffectiveness of buprofezin on E. formosa in comparison with other insecticides and also having high toxicity on the egg and 3rd nymph stage of the pest is recommended.

Keywords


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