author(s)
Swati Mehra and Krishna Rolania

abstract
The present study investigated the population dynamics of whitefly, Bemisia tabaci (Gennadius) and its parasitoid, Encarsia lutea (Masi) on Bt cotton hybrid BIO-6588 (BG II) under unsprayed conditions at Hisar. Peak population of whitefly adults (20.3 whitefly adults/leaf) was observed during 9^th to 18^th September. Nymphal population (34.1 whitefly nymphs/leaf) and per cent parasitization (28.1%) were observed maximum during 19^th to 28^th September. Whitefly nymphal parasitization by E. lutea varied from 6.0 to 28.1 per cent during the period of study (June to October). Total rainfall had significant and negative impact on the whitefly adult (r = -0.62) and nymphal population (r = -0.60). All the remaining weather factors showed non-significant correlation with whitefly population. Moreover, no significant correlation was found between parasitization and the weather factors.