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Objective: to evaluate the toxicity potential of lemon grass [Cymbopogon citratus (C. citratus)] products against adult rice weevil, Sitophilus oryzae. Methods used: Lemon grass (C. citratus) leaves were sun dried for 7 days, pulverized and sieved using 0.5 mm mesh size to obtain fine powders. About 500 g of the powder were dissolved in 1,000 ml of 90% methanol to produce the extract. The powder and extract were used for the bio assay. The powder was tested at 1.0, 1.5, 2.0 and 2.5 g/10 g rice grains, respectively. The toxic potential of the extract of concentration of 1.0, 1.5, 2.0, and 2.5 mg/ml were evaluated using the filter paper method. The experiment was setup on a completely randomized design using three replicates per treatment. Results obtained: The results indicated significant difference (F = 7.450; df = 3.15; P 0.05) in mean percentage mortality after 24, 48, 72, and 96 h exposure with the powder compared with the control. Significantly (F = 5.519; df = 3.15; P 0.05) higher percentage adult mortality was also observed in the extract after 24, 48, 72, and 96 h exposure compared with the control.
About the author
Mr Uwamose Martin Nelson Osaigbokan was born in the middle 1990¿s. He obtained his first degree (BSc) in Zoology from Delta State University, Abraka, Nigeria. As a young versatile researcher, Mr. Uwamose¿s field of research has so far focused on Entomology and Toxicology (Ento-toxicology). He has a number of publications in reputable journals.
