Annals of Plant Protection Sciences

Native strain of Chrysoperla carnea was collected from the different crop ecosystems and mass produced in the laboratory on its factitious host. Through bioassay technique, superior insecticides tolerant strain of C. carena were tested and selected against four commonly used insecticides namely; endosulfan, chlorpyriphos, cartap hydrochloride and imidacloprid. At successive generation of selection, predator developed two times more tolerance against endosulfan to the parental stock after 12^th successive generations of rearing at half of the recommended field dose of endosulfan with LC₅₀ 0.41%. C. carnea had high level of tolerance at F₁₅ generation against chlorpyriphos as indicated by the seven folds increase in LC₅₀ value (0.043%) when compared with that of the parental stock at half of the field recommended dose of chlorpyriphos. At F₁₁ generation, C. carnea population developed five folds tolerance (LC₅₀ value 0.041%) against cartap hydrochloride when compared with that of the parental stock and for imidacloprid resistance, C. carnea developed seven folds tolerance (LC₅₀ value 0.0017%) when compared with that of the parental stock and developed tolerance almost half of the field recommended dose of imidacloprid.