Abstract
The present study was planned to explore the possibility of using Bacillus thuringiensis var. tenebrionis in mixtures with sub-lethal levels of some insecticides to control 2.-4.larval stages of Colorado Potato Beetle ( Leptinotarsa decemlineata Say). In this study, the bacterial insecticide Bacillus thuringiensis var. tenebrionis and three widely used insecticides (deltamethrin, azinphos-methyl and trichlorfon) were tested against larvae of the Colorado potato beetle. It was concluded that insecticides and Bt were compatible. combinations of LC10, LC30 and LC50 levels of the three insecticides with LC15 of Bacillus thuringiensis var. tenebrionis showed potentiation of toxicity to the larval stages, especially with deltamethrin and azinphos-methyl. The results emphasize that the larvae which survive the treatment are subject to retardation of adult emergence, and do not always develop into normal adults. The long term effect of in mixtures with conventional insecticides pays the way for new advantageous uses in the context of IPM, rationalization the use of synthetic insecticides and less pollution of the environment.
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