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Tests were carried out to study the toxicity, oviposition suppression, ovicidal and larvicidal effects of Chenopodium ambrosioi- des L. as powder, extracts and essential oil against Callosobruchus maculatus F. (Coleoptera: Bruchidae), Sitophilus zeamais Motschulsky (Coleoptera: Curculionidae) and Tribolium castaneum Jacqueline du Val. (Coleoptera: Tenebrionidae). The powder formulation was more toxic to S. zeamais than either C. maculatus or T. castaneum with 48 h LC 50 values of 0.46 g/kg, 1.60 g/kg and 2.14 g/kg, respec- tively. Ethanol extract was more toxic to C. maculatus with a 48 h LC 50 value of 0.023 g/l, than other test insect species. The essential oil treatment demonstrated higher fumigant toxicity against C. maculatus than S. zeamais with 24 h LC 50 values of 1.33 µl/l and 1.90 µl/l respectively. The oil vapour showed activity against C. maculatus egg, but had no appreciable larval mortality. The weight loss of grains admixed with C. ambrosioides powder was lower than the controls after 150 days of field storage.

Toxicity of Chenopodium Ambrosioides L. (Chenopodiaceae) Products From Nigeria Against Three Storage Insects