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The banana weevil (BRW), Cosmopolites sordidus (Germar) (Coleoptera: Curculionidae) is the most devastating pest of banana in most production areas, which limits production and productivity of bananas throughout the world. Numerous chemical insecticides are available commercially to manage this pest. However, it was more expensive and undesirable for the management of this pest. In this study, the effect of commercially available neem-based botanical insecticide neem gold on BRW was studied under laboratory condition. The weevils were separately maintained up to 96 hours on neem gold treated banana rhizomes. The total and differential haemocytes count; total body protein and fat body protein profile were performed using SDS-PAGE. 33.33% of C. sordidus were settled on neem-gold and significantly (P<0.05) caused minimum mortality (6.7%) whereas 66.6% weevils preferred the untreated pseudostem. However, treatment reduced both total haemocyte count (40%) and various haemocytes level. The total body protein and fat body protein analysis shows that 4 KDa to 163 KDa molecular weight and 144 to 7 KDa molecular weight polypeptides respectively are present. Consumption of neem gold impregnated banana pseudostem reduced the total body protein polypeptide to 8 KDa whereas the fat body polypeptide increased from 161 to 8 KDa. These results suggested that neem gold could be used as insecticide against C. sordidus.
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