Effect of newer insecticides on per cent mortality of Trichogramma chilonis Ishii under laboratory conditions

Abstract

The present studies were conducted under laboratory conditions on evaluation of relative safety of commonly used newer insecticides to Trichogramma chilonis Ishii, a potent egg parasitoid of lepidopteran insect pests reared on UV irradiated and Unirradiated eggs of Corcyra cephalonica. Eight newer insecticides with different modes of action were chosen for present study. The results revealed that, the treatment of azadirachtin 1500 ppm caused least mortality of T. chilonis immature stages developing inside the parasitized C. cephalonica eggs. The insecticides viz., chlorantraniliprole 18.5 SC and imidacloprid 17.8 SL recorded less than 30% mortality of T. chilonis, thus were found relatively safer as compared to rest of the chemical insecticides. Whereas, a combination product of lambda cyhalothrin 9.5% + thiamethoxam 12.6% ZC recorded least emergence, indicating its detrimental effects on T. chilonis. Hence these insecticides can be safely included in bio intensive IPM.