Effect of sowing time and varieties on incidence of insect pests of soybean

Abstract

An experiment was conducted to study the effect of sowing time and varieties on incidence of insect pests of soybean. The crop sown during 1st week (timely sown) of July had significantly higher incidence of Bemisia tabaci and Obereopsis brevis as compare to crop sown in the 3rd week (late sown) of July. The incidence of Chrysodeixis acuta, Helicoverpa armigera and Spodoptera litura significantly lower in timely sown as compared to late sown. Among test varieties, significant lowest incidence of B. tabaci and S. litura was recorded in soybean variety of RKS-24 while, the significant lowest incidence of C. acuta, H. armigera and O. brevis was observed in the JS-95-60. In case of yield, the significantly highest yield with mean of 1564 and 1650 kgha-1 was recorded in timely sown crop. Among the varieties, significantly highest seed yield of 1840 and 1812 kgha-1 was recorded in RKS-24.