Use of Plant Leaf Powders for the Management of Sitophilus oryzae (Coleoptera: Curculionidae) in Maize

The leaf powders of Vitex negundo (Five leaved chaste tree: Verbenaceae), Adathoda vasica (Malabarnut tree: Acanthaceae), Catharanthus roseus (Periwinkle: Apocynaceae) and Lantana camara (Wild sage: Verbenaceae) @ 5% w/w were evaluated for their efficacy against field carry over infestation of Sitophilus oryzae (L.) in stored maize during five months storage period. All leaf powders reduced insect population density, grain damage and grain weight loss compared to control. These plant materials have good potential for use as grain protectant botanicals against the weevil.