Infestation Status of Some Major Insect Pests of Soybean and Their Management

The study was conducted to investigate the effective management of some major insect pests of soybean in the research field of Sher-e-Bangla Agricultural University, Dhaka during the period from December, 2020 to March 2021. The experiment was designed with Randomized Complete Block Design (RCBD) with three replications. During this experiment total six insecticides were tested viz., Lambda-Cyhalothrin @1ml/L of water Neemoil @1ml/L of water with 3g of detergent; Thiamethoxam @0.5g/L of water; Spinosad @0.5ml/L of water; Chlorantraniliprole @0.3ml/L of water; Emamectin Benzoate @1ml/L of water. Data on different pests populaton number and yield were collected and recorded. The lowest population per unit of whitefly and jassid was found in Emamectin Benzoate @1ml/L of water treated plots after consecutive three times application. Similarly, lowest unit of aphid was found in Chlorantraniliprole @0.3ml/L of water; treated plots. On the other hand, Thiamethoxam @0.5gl/L of water were found effective against whitefly, aphid, pod borer per plant, while the highest infestation was observed in control plots. The maximum yield was 1.68 t/ha, observed from Emamectin Benzoate @1ml/L of water, followed by (1.61 t/ha ) Chlorantraniliprole @0.3ml/L of water Among the treatments, Emamectin Benzoate @1ml/L of water was more effective for the controlling of insect pests as well as yield of soybean.