Effect of biopesticides on the lactate dehydrogenase (LDH) of the rice leaffolder, Cnaphalocrocis medinalis (Guenée) (Insecta: Lepidoptera: Pyralidae).
The effects of bacterial toxins (Bacillus thuringiensis) and botanical insecticides (Azadirachta indica and Vitex negundo) on lactate dehydrogenase (LDH) activity in Cnaphalocrocis medinalis (Guenée) (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.
Nathan
Sengottayan Senthil
SS
Department of Environmental Engineering, Chonbuk National University, Jeonju City, Chonbuk 561 756, South Korea. senthilkalaidr@hotmail.com
Kalaivani
Kandaswamy
K
Murugan
Kadarkarai
K
D000818:Animals; D031601:Azadirachta / Q000633:toxicity; D001427:Bacterial Toxins / Q000633:toxicity*; D007306:Insecticides / Q000633:toxicity*; D007770:L-Lactate Dehydrogenase / Q000378:metabolism*; D007915:Lepidoptera / Q000187:drug effects* / Q000201:enzymology*; D012275:Oryza / Q000469:parasitology*; D010936:Plant Extracts / Q000633:toxicity; D020950:Vitex / Q000633:toxicity
D001427:Bacterial Toxins; D007306:Insecticides; D010936:Plant Extracts; D007770:L-Lactate Dehydrogenase