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Direct and residual toxicities of seed extracts and leaf powders of the neem tree (Azadirachta indica), marigold (Tagetes erecta) and durba (Cynodon dactylon) along with two commercial insecticides (malathion and carbaryl, respectively) towards the red flour beetle (Tribolium castaneum), a major stored-product pest, were evaluated. All seed extracts and leaf powders showed a certain degree of toxicity...
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