Department of Entomology, Chaudhary Charan Singh Haryana Agricultural University, Hisar-125 004, Haryana, India
*Corresponding author's present address: Crop Pest Surveillance and Advisory Project-Maharashtra, Department of Agricultural Entomology, Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani-431 402, Maharashtra, India; E-mail: santoshkedar56@yahoo.com
Online published on 5 October, 2016.
Studies on seasonal incidence of B. tabaci nymphs and adults on Bt cotton hybrid RCH 134 BG II indicated that the pest reached its peak twice in the cotton growing season first two years (28th to 30th SW and 40th to 41st SW). But, in 3rd year only single peak was observed (30th SW). Among the weather parameters, minimum temperature, evening relative humidity and wind speed had significant negative correlation with whitefly population. The multiple regression analysis revealed the combined effects of weather parameters explained 39–59 per cent (R2) and 47–52 per cent (R2) variability in B. tabaci nymphal and adult population on Bt cotton.
Seasonal incidence, Bemisia tabaci, whitefly, weather parameters
