Effect of Different Pesticides on Lipase Production by Isaria fumosorosea

摘要

The influence of twelve different pesticides(six insecticides and six fungicides) on lipase production by Isaria fumosorosea was investigated under laboratory conditions. Imidacloprid caused higher reduction in enzyme activities at all three concentrations whereas very low reduction in enzyme activities was caused by azadrichtin and Indoxacarb when used at 10μg/ml. In case of fungicides, propiconazole and pyraclostrobin caused higher reduction in enzyme activities at all three concentrations whereas low reduction in enzyme activities was caused by chlorothalonil and mancozeb when used at 10 μg/ml. Different insecticides significantly affected the toxicity of I. fumosorosea lipase against second instar Dysmicoccus neobrevipesnymphs. I.fumosorosea lipase combined with azadrichtin was proved to be the most aggressive, and those from control were the least virulent with a mean ST50 value of 6.34 ± 0.41 d.