Susceptibility ofTelenomus remusNixon, an exotic parasitoid ofSpodoptera litura(F.), to some pesticides

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Abstract
A total of thirteen pesticides were tested against Telenomus remus Nixon, an exotic parasitoid of Spodoptera litura (F.). At field‐recommended dosage, fungicides (Dithane and Fytolan) and the acaricides (Sulphur and dicofol) did not affect the parasitoid. All of the insecticides included in the study (monocrotophos, phosalone, endosulfan, methomyl, methyl demeton, dimethoate, chlorpyriphos, quinalphos and carbaryl) proved detrimental to adult T. remus. However, these insecticides did not affect the parasitoid emergence from the parasitized eggs except chlorpyriphos and quinalphos. When fresh eggs, treated with these two insecticides, were exposed to T. remus percentage parasitism was found to be poor whereas the eggs treated with other insecticides were found completely parasitized by T. remus. Spraying of chlorpyriphos and quinalphos should be avoided when this parasitoid is released.

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