The efficacies of plant oils of groundnut, soya bean and Actellic E.C. were evaluated for the control of Sitophilus zeamais infesting maize seeds. The plant oils were used at 0.5 %, 1.0 % and 1.5 %/100 g maize seeds while Actellic E.C. 25 % was applied at the rate of 2.5 ml, while the control has no treatment. All the treatments were repeated three times and also the control. The following were assessed mortality, progeny emergence, and seed damage. The results showed that Actellic E.C. at 48 hrs and 72 hrs caused significantly higher (P < 0.05) mortality (100 %) of adult S. zeamais than plant oils (groundnut and soya oil) while groundnut oil at 1.5 % had higher mortality compared to the control. The groundnut oil at all levels and soya bean oil at 0.5 % and 1.0 % were not significantly different compared to control. At 8 weeks, the progeny emergence was significantly higher (P < 0.05) in the control than different concentrations of groundnut oil, soya oil, and Actellic E.C. There was no significant difference in term of grain damage in all the treatment except the control. These volatile oils can be used to protect stored products against insect pests in developing countries.
Keywords: Plant oils, maize, Actellic E.C, Sitophilus zeamais
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