Relative toxicity of seed extracts on rice weevil Sitophilus oryzae

Stored products are attacked by a number of insects. It causes heavy loses to the grains. Sitophilus oryzae is the major pest of stored grains. Insecticides can be used to protect the grain from infestation of insects. But synthetic pesticides lead to health hazards. So Biopesticides are required for grain storage purpose. Seed extracts of some plants possess insecticidal properties. In this investigation seed extract of Annona squamosa, Glycine max, Helianthus annus and Ricinus Communis are used against rice weevil, Sitophilus oryzae. All the four seed extracts proved promising for control of Sitophilus oryzae.