Experiments were conducted to evaluate the toxicity of six botanicals, dholkalmi, Ipomoea fistulosa; dutura, Datura fastuosa; eucalyptus, Eucalyptus citriodora; hatisur, Helitropium indicum; khetpapri, Hedyotis corymbosa and urmoi, Sapium indicum against lesser mealworm, A. (Panz) diaperinus and rice weevil, S. (L.) oryzae. Leaf and seed extracts of botanicals were prepared by using acetone, ethanol and water as,solvents. The Results showed that all the extracts of test plants had toxic effect on both the insects. The dholkalmi bark extract was toxic for lesser mealworm (mortality, 47.92%) and dholkalmi leaf extract was found to be the most toxic for rice weevil (mortality, 44.89%). Ethanol extract showed highest toxic effect followed by acetone and water extracts. Effectiveness of all the plant extracts increased proportionally with the increase of doses and decreased proportionally with the increase of time. The seed/bark extract was more effective than leaf extract.