Comparative study of insecticide susceptibility and activities of detoxification enzymes in larvae and adults of cotton bollworm, Heliothis armigera
1996
Leonova, I.N. | Slynko, N.M.
Susceptibility of moths and larvae of cotton bollworm to ten different insecticides by topical application and their effect on enzymes involved in insecticide detoxification were determined. The moths were more susceptible than larvae to the insecticides tested, with the exception of pyrethroids and sulprofos. Combination of several insecticides with the synergists piperonyl butoxide (PB) and S,S,S-tributylphosphorotrithioate (TBPT) showed that lower level of carbamate and organophosphate toxicity in larvae, as compared to moths, was the result of higher detoxification enzyme activities. Studies of the post-treatment fate of 14C-labeled malathion and 3H-trans-permethrin indicated that both the cuticular penetration, internal accumulation, and excretion of applied toxicants and their metabolites occurred more rapidly in larvae than in moths. The activities in vitro of esterases, glutathione S-transferases and monooxygenases were determined but there were no correlations with either toxicity of insecticides or synergistic effect for combination of insecticides with PB and TBPT in moths.
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