MANAGEMENT OF MAJOR INSECT PESTS OF SOYBEAN THROUGH SOME IPM PACKAGES

Abstract

The experiment was conducted at Sher-e-Bangla Agricultural University, Dhaka, Bangladesh to study the management of major insect pests of soybean through some IPM packages during the period from November 2021 to February 2022 in the Rabi season. The experiment was laid out in Randomized block design with five different IPM packages viz., T : IPM package-1: Hand picking of larvae + bird perching + application of spinosad (Success 2.5 SC)@ 1.2 ml L 1 -1 of water, T 2 : IPM package-2: Hand picking of larvae + bird perching + application of indoxacarb (Rav-zoom 14.5 SC) @ 0.7 ml L of water, T : IPM package-3: Hand picking of larvae + bird perching + application of quinalphos (Convoy 25 EC) @ 1.5 ml L 3 -1 of water, T 4 : Farmers practice and T : Untreated control, for the management of major insect pests of soybean with three replications for each treatment. Experimental result showed that in the experimental field, nineteen insect pests from sixteen families and six orders attacked soybean. The majority of them belonged to the Orders Lepidoptera, Hemiptera, and Coleoptera. Among the major pests of soybean, whitefly, jassid, pod borer and leaf roller were more damaging than other pests on soybean research field. The occurrence of these pests varied significantly due to the use of various IPM packages. Among the treatments, T treatment reduced the incidence of these insect pests on soybean plant at different days after sowing. The highest number of healthy pods plant -1 (27.53), 1000-seed weight (115.67 g) and seed yield (2.25 t ha -1 ) were also recorded in T treatment. On the other hand, the lowest seed yield (0.89 t ha -1 2 ) was found in untreated control plot (T 5 ). The T treatment performed as the best treatment in terms of benefit cost ratio (4.72) compared to other treatments. Based on the investigation of the above results, it may be concluded that among all integrated pest management packages, the T treatment demonstrated the best performance in terms of managing the major insect pests of soybean as well as growth and yield among all IPM packages used in this study.