Selective Toxicity of Eight Insecticides to Henosepilachna vigintioctopunctata Fabricius and Pediobius foveolatus Crawford

Toxicity of 8 insecticides to the larvae of Henosepilachna vigintioctopunctata Fabricius and its major larval parasite, Pediobius foveolatus Crawford ,was investigated in the laboratory.Abamectin showed highest selective toxic ity between H.vigintioctopunctata and P.foveolatus and fenvalerate a lit tle bit lower.Fipronil etc.had no selective protection to P.foveolatus. It is recommended that abamectin should be selected to control H.vigintioctopunctat a during seasons when P.foveolatus and other natural enemies are relativel y numerous and fenvalerate may be alternatively used.