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Experiments were conducted to assess insecticidal effects of leaf extracts of Euphorbia balsamifera, Lawsonia inermis and Mitracarpus hirtus against Rhyzopertha dominica F. Acetonic leaf extracts of the botanicals at varying concentrations of 6.25, 12.50, 25.00, 50.00, 100.00 mgml -1 and permethrin powder at 0.056% (w/w) were applied to 20 g of sorghum grains in different plastic bottles. None of the extracts or permethrin powder was added to the control. The experiment was arranged in a completely randomized design (CRD) and replicated three times. Phytochemical analysis of the test plants was conducted. Effects of the treatments on adult mortalities as well as their LC50 against R. dominica were also determined. Findings of the study revealed the presence of alkaloids, carbohydrate, phytesterols, phenolic compounds, flavonoids, saponins, tannins and cardiac glycosides in the botanical extracts. The plant extracts were found to be highly effective in killing adult R. dominica leading to total adult mortality within 12 days after treatment (DAT). M. hirtus was found to be the most effective botanical with its LC50 values lower than that of the other botanicals. Acetonic leaf extracts of E. balsamifera, L. inermis and M. hirtus could therefore be utilized to reduce R. dominica infestations in stored sorghum.

indian journal of pure and applied biosciences

Toxicity of Acetonic Leaf Extracts of Three Botanicals against the Lesser Grain Borer, Rhyzopertha dominica F. (Coleoptera: Bostrichidae) in Stored Sorghum