author(s)
Rana Sen, Saayan Samanta, Dr. Arunava Samanta and Suman Nandi

abstract
A field experiment was conducted with seven bio pesticides, Derisom, Anosom, Margosom, Spinosad, Verticillium lecanii, Beauveria bassiana and B.t. varkurstaki along with a chemical check, Imidacloprid to find out their bio-efficacy against major pests of Chilli specially chilli aphid (Aphis gossypii) Glover, chilli thrips (Scirtothrips dorsalis Hood), yellow mite (Polyphagotarsonemus latus Banks) and fruit borer (Helicoverpa armigera Hub.). Results shows that Imidacloprid was most effective against aphid with 76.65% reduction of population over control followed by Derisom(68.38%), Margosom(64.98%) and V.lecanii (63.49%). Highest percentage reduction of thrips over control was found in Imidacloprid treated plots (73.40%) followed by Margosom (62.52%) and V. lecanii (59.92%). Highest percentage reduction of yellow mite over control was found in Derisom treated plots (61.52%) followed by V. lecanii (55.27%).