Evaluation of Carbosulfan 25 EC on the egg parasitoid, Trichogramma chilonis Ishii (Hymenoptera, Trichogrammatidae)

Abstract

Experiments to ensure the safety of carbosulfan, to Trichogramma chilonis Ishii in terms of adult emergence and parasitization by direct spraying on egg card technique, revealed significant adverse effect on adult emergence and parasitization. The number of adult emergence ranged from 41.96 to 58.0 and, parasitization 12.62 to 32.6 per cent at 24 HAT; while it was 44.03 to 64.63 and 18.95 to 38.8 per cent respectively at 48 HAT for all the tested three doses of carbosulfan 25 EC @ 250, 500 and 1000 g a.i ha^-1. Carbosulfan 25 EC @ 250 g a.i ha^-1, recorded maximum adult emergence (58.00 at 24 HAT and 64.63 at 48 HAT) and maximum per cent parasitization (32.60 at 24 HAT and 38.80 at 48 HAT). Hence usage of carbosulfan 250 EC is recommended only at the low dose of 250 g a.i. ha^-1.