Efficacy of selected insecticides against common soybean insect pests
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This report tackles the question: efficacy of selected insecticides against common soybean insect pests. In total 8 insecticides; profenofos, dimethoate, chlorpyrifos, dichlorvos (organophosphates), Acetamiprid, imidacloprid (neonicotinoids), methomyl (carbamate), and cypermethrin (pyrethroid) were studied against fours soybean insect pests; whiteflies, pod borers, pod bugs and soybean beetles. A research was carried out at Makerere University Agricultural Research Institute- Kabanyolo. The experiment was set in a completely randomized block design with three replications. Results showed that organophosphates; profenofos followed by dimethoate were superior at controlling the soybean beetles and also increasing soybean yield. However, Acetamiprid (neonicotinoid) provided the best control for whiteflies, pod borers, and pod bugs but the yield was relatively low. Imidacloprid was effective on whiteflies and pod bugs and wasn't phytotoxic to the soybean. Cypermethrin and chlorpyrifos were not effective at reducing whitefly population. All selected insecticides provided good control over the pod bugs and reduced their population as compared to the control. Although there was a significant difference in the means of the plant parameters; leaf area, plant height, pod and flower number amongst treatments, this had insignificant effect on yields. Generally, the total number of insect pests was notably low and soybean beetles were the most prevalent insect pests followed by whiteflies and lastly the pod borers and bugs.