Seasonal incidence of major pests on soybean and their correlation with weather parameters

During studies on seasonal incidence the incidence of leaf miner, A. modicella (maximum 0.60 larvae/mrl in 33^rd SMW), S. litura (maximum 2.66 larvae/mrl in 35^th SMW) and H. armigera (maximum 0.33 larvae/mrl in 29^th SMW) was very low/negligible. The girdle beetle, O. brevis incidence started in 32^nd SMW by recording 1.36% infestation whichat harvest reached 15.71%, whereas stem tunneling observed due to stemfly at physiological maturity was 43.32%. Semilooopers, G. gema, A. janata, C. acuta recorded a peak of 9.00 larvae/mrl during 36^th SMW. The infestation of O. brevis in relation to minimum temperature (−0.726**) and wind velocity (−0.606*) was negatively significant. The population of H. armigera in relation to wind velocity (r = 0.576*) was found positive and significant.