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Effect of biopesticides on the lactate dehydrogyenase (LDH) of the rice leaffolder, Cnaphalocrocis medinalis (Guenee) (Insecta: Lepidoptera: Pyralidae)



Effect of biopesticides on the lactate dehydrogyenase (LDH) of the rice leaffolder, Cnaphalocrocis medinalis (Guenee) (Insecta: Lepidoptera: Pyralidae)



Ecotoxicology and Environmental Safety 65(1): 102-107



The effects of bacterial toxins (Bacillus thuringiensis) and botanical insecticides (Azadirachta indica and Vitex negundo) on lactate dehydrogenase (LDH) activity in Chaphalocrocis medinalis (Guenee) (the rice leaffolder) were evaluated. Bacterial toxins and botanical insecticides affected the LDH activity individually and in combination. When they were combined, the effect was more severe at low concentration. There was a decrease in enzyme activity over controls at all concentrations tested. The combined effect of the three biopesticides resulted in a considerable decrease in enzyme activity, indicating strong enzyme inhibition. Clear dose-response relationships were established with respect to enzyme activity.

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