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Effect of wood ash, river sand, mineral oil and dry pepper (Capsicum spp) dust on the population of Sitophilus zeamais (Motschulsky, 1855) (maize weevil) in maize grain storage

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Experiment to evaluate the effect of wood ash, river sand, mineral oil and dry pepper (Capcium spp) dust on the population (control) of Sitophilus zeamais (Motschulsky, 1855) (Coleoptera: Curculionidae) (maize weevil) was conducted. The experiment was laid out in a Completely Randomized Design (CRD) consisting of five (5) treatments; 0g, 5g river sand, 5g dry pepper dust, 5g wood ash and 5g mineral oil. All treatment were replicated three times. Data were taken on the number of population of Sitophilus zeamais emerging from individual treatment, weight loss on grain maize was taken for S. zeamais infestation. The effect of the various treatment on maize seed with S. zeamais were not significant (P>0.05), though the highest number of population of the weevil was recorded in the control (0g). Zero population of S. zeamaiswas recorded in wood ash treatment at 5g which significantly (P<0.05) protected the grains over the control. Significant (higher) weight loss was recorded in the control since no treatment was applied. All treatments except the control indicated potential of reducing (controlling) the weevil. Data obtained in these experiments indicated that wood ash, pepper dust including river sand produced the most protective/control effect on the population of the weevil over the control. Result of the study showed that river sand, pepper dust, wood ash and mineral oil (vegetable oil) performed positively, and hence, exerted protectant properties on the treated maize grains in order to preserve the quality of the grains.
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