Effects Of Decamethrin And Permethrin On The Biology Of Two Coccinellid Predators Of Black Bean Aphids

Erlinda  A. Vasquez,; Emiliana  N. Bernardo,; Lorenza  B. de Pedro,

Effects Of Decamethrin And Permethrin On The Biology Of Two Coccinellid Predators Of Black Bean Aphids

Erlinda A. Vasquez | Emiliana N. Bernardo | Lorenza B. de Pedro

Abstract:

The two species of coccinellid predators ( Chilomenes sexmaculata Fabr. and Coleophora inaequali5 Fabr .) treated with decamethrin and permethrin howed slightly longer total developmental period, higher mortality rate and lower fecundity rate than the untreated ones, particularly C. inaequali . No significant differences were found in percent egg hatchability and adult longevity. These results were observed only in the first generation where individuals were in direct contact with the insecticides but not in the second and succeeding generations. Data generally suggest that decamethrin is relatively safe to the two perie of predators and that decamethrin-coccinellid combination could be recommended for black bean aphid control.

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