author(s)
R Channakeshava, G Somanagouda and Sangshetty

abstract
Field experiments were conducted at MARS, UAS, Dharwad during kharif 2017-18 and 2018-19 on seasonal incidence of Spodoptera litura in two different soybean varieties, JS 335 and DSb 21. The crop remained vulnerable to S. litura from 31^st MSW to 37^th MSW which followed an increasing trend from 0.40 to 4.80 larvae per meter row length (mrl) in variety JS 335 during 2017-18. The highest leaf damage of 35.77% were recorded during 37^th MSW in JS 335 whereas, it was 28.85% in DSb 21 during the respective MSW. During 2018-19, S. litura infestation commenced on 30^th MSW in both the varieties which attained peak population during 37th MSW. Correlation studies indicated that a highly significant and positive relationship (r=0.77) between maximum temperature and incidence of S. litura during 2017-18 whereas, morning relative humidity showed a significant and negative correlation (r= -0.64) with S. litura incidence during 2018-19.