Toxicity of plant based chemicals against Trogoderma granarium, A destructive pest of stored-grains

Stored products of agricultural and animal origin are attacked by more than 600 species of beetle pests. Khapra beetle, Trogoderma granarium is most destructive causing quantitative and qualitative losses of wheat in Pakistan. In this study, 0, 50, 150, 250, 350 and 450 mg/ ml concentration of extracts of Azadirachta indica and Euclyptus globulus were tested against T. granarium. The extract of A. indica was found to be more toxic. The number of emerged adults decreased while mortality of larvae and adults increased with concentration. The number of emerged adults was significantly higher (p < 0.05) in control and maximum larval mortality (36.82 ± 2.95% and 30.70 ± 2.90%) was observed with at 450 mg/ml dose of A. indica and E. globulus, respectively. Each extract showed high toxicity towards the adult stage than larval. Wheat losses were reduced by treating with plant extracts and botanicals are more effective.