ORIGINAL ARTICLE
Toxicity of Chenopodium ambrosioides L. (Chenopodiaceae) products from Nigeria against three storage insects
1
Department of Zoology, Lagos State University, Ojo, Lagos
2
Department of Zoology, University of Lagos, Akoka, Lagos
3
Department of Chemistry, Lagos state University, Ojo, Lagos
4
Chemistry Department, University of Limpopo, South Africa
Journal of Plant Protection Research 2010;50(3):379-384
KEYWORDS
Chenopodium ambrosioides LCallosobruchus maculatus FSitophilus zeamais MotschulskyTribolium castaneum Jacqueline du Valpowderextractsessential oils
TOPICS
ABSTRACT
Tests were carried out to study the toxicity, oviposition suppression, ovicidal and larvicidal effects of Chenopodium ambrosioides 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 LC50 values of 0.46 g/kg, 1.60 g/kg and 2.14 g/kg, respectively. Ethanol extract was more toxic to C. maculatus with a 48 h LC50 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 LC50 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.
CONFLICT OF INTEREST
The authors have declared that no conflict of interests exist.
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