Seasonal incidence of pests of soybean (Glycine max (L.) Merrill influenced by different sowing dates
Sable GS, More DG, Munemanik RM and Wahekar GR
Field experiment was conducted at the Farm of All India Coordinated Research Project on Soybean, Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani during kharif-2015 to study pest incidence of soybean as influenced by sowing dates, to work out the correlation of pest incidence with weather parameters and to study the effect of sowing dates and pest incidence on soybean yield.
During the season of kharif 2015, girdle beetle and stemfly were observed as major pests. Incidence of defoliators viz., H. armigera, S. litura and semiloopers was found moderate to low while low to high incidence of jassids and whitefly was observed. Population of grey weevil, Myllocerus sp. was also observed. Among natural enemies, spiders were found predominantly. Girdle beetle infestation on the crop sown on 15th and 30th June showed positive significant correlation with rainfall and morning relative humidity whereas, it showed significant negative correlation with minimum temperature, bright sunshine hours and wind velocity while the crop sown on 15th July, 30th July and 15th August showed significant positive correlation with maximum temperature while minimum temperature has negative significant correlation.
Semiloopers showed negative significant correlation with evaporation when the crop was sown on 15th June. It also showed positive correlation with minimum temperature when the crop was sown on 15th July and 15th August.
The population of jassids on the soybean crop sown on 15th June showed significant positive correlation with morning and evening RH while with maximum and minimum temperature, evaporation and bright sunshine hours, it showed significant negative correlation. Jassid population showed significant positive correlation with evaporation when the crop was sown on 30th July. Whitefly also showed significant positive correlation with morning RH while it showed negative significant correlation with maximum temperature and bright sunshine hours.
Sable GS, More DG, Munemanik RM, Wahekar GR. Seasonal incidence of pests of soybean (Glycine max (L.) Merrill influenced by different sowing dates. J Entomol Zool Stud 2018;6(6):778-781.