Efficacy of some botanical powders against rice weevil, Sitophilus oryzae infesting sorghum seed under storage conditions

The present studies were undertaken to evaluate the efficacy of some botanical powders against rice weevil infesting stored sorghum seed. In all twelve treatments and one untreated control were used. The bark powder of C. zeylanicum was found to be the most effective treatment amongst all the botanical powders, recording 100% adult mortality, while A. calamus used as standard check recorded 92.25% mortality. The seed powder of A. squamosa (92.74%) and A. Indica (85.33%) also gave better protection. Data recorded on percent weightloss was also minimum in C. zeylanicum (1.45%) followed by A. Squamosa C1.74%) and A. calamus (1.78%) while untreated control showed 44.33% weight loss.