author(s)
Bangale SA, Parmar GM and Dhandge SR

abstract
Investigation on seasonal incidence of soybean defoliators and their correlation with weather parameters was carried out at Instructional Farm, College of Agriculture, Junagadh Agricultural University, Junagadh during kharif season of 2017.Studies on seasonal incidence of defoliators on soybean revealed that the incidence of tobacco leaf eating caterpillar, Spodoptera litura (Fabricius) commenced from 1^st week after germination i.e. 3^rd week of July (0.81 larvae/plant) and reached at peak level (5 larvae/plant) at 9^th week after germination coinciding with 2^nd week of September. All the weather parameters were non-significantly correlated with the population of S. litura during kharif season of 2017. Incidence of gram pod borer, Helicoverpa armigera (Hubner) (0.36 larvae/plant) commenced from 1^st week after germination i.e. 3^rd week of July and reached at peak level (2.4 larvae/plant) at 7^th week after germination coinciding with 1^st week of September. The correlation between the pest population and morning relative humidity and evening relative humidity was positively significant.