author(s)
Rohit Rana, Gaje Singh, Aditya Kumar Tanwar and Rakesh Kumar

abstract
The present investigation was conducted to study the effect of weather parameters on the infestation of yellow stem borer, Scirpophaga incertulas Walker in basmati rice. Results revealed that the peak period of pooled maximum dead hearts (9.46%) of both cropping seasons was recorded in 35th standard week. Thereafter, infestation declined gradually, but again increased at reproductive stage of crop and the pooled maximum white ears (8.48%) infestation was recorded during both the seasons at 40th standard week. Regression analysis of dead heart formation explained 60.20-61.60 per cent variability due to all tested environmental factors combined while in case of white ears the variability ranged from 63.90-73.50 per cent. Stepwise regression of pooled data of both the years revealed that incidence of YSB was depended on rainfall.