Contact Toxicity Of Decamethrin And Permethrin On Black Bean Aphid And Two Of Its Coccinellid Predators

Erlinda  A. Vasquez,; Emiliana  N. Bernardo,; Ma. Flerida  A. Cariño,

Contact Toxicity Of Decamethrin And Permethrin On Black Bean Aphid And Two Of Its Coccinellid Predators

Erlinda A. Vasquez | Emiliana N. Bernardo | Ma. Flerida A. Cariño

Abstract:

The contact toxicity of decamethrin and permethrin was evaluated on adult black bean aphids. ( Aphis craccivora Koch) and third instar larvae and adults of its coccinellid predators. Chilomenes sexmaculata Fabr. and Coleophora inaequalisFabr. Based on LC50 , decamethrin is more toxic to the black bean aphid than permethrin particularly after 48 hours exposure. The third instar larvae of C. inaequalis exhibited higher LC 50 than C. sexmacu/ata at 24 hours but not after 48 hours of exposure to decamethrin. However, the laUer species was more tolerant to permethrin than the former as indicated by the lower LC so obtained in C. inaequalis. The LC 50 values of the two insecticides were consistently lower for adults of C. sexmaculata than C. inaequalis at both exposure periods. The two insecticides used were more toxic to the aphids than to the coccinellid predators. Hence, they could be used to control aphids without adversely affecting the coccinellids which could also be utilized as biocontrol agents.

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