Abstract
Comparative effect of four insecticides viz. sweep (phenpropethrin+buprofezin) 250 EC @ 1500 ml/ha, Pride (buprofezin) 25 WP rQI, 1225 g/ha, endosulfan 35 EC @ 1750 ml/ha and methamidophos 60 SL @ 1000 mVha was determined on whitefly population during 1998 cotton crop. Sweep 250 EC provided the best control by maintaining the whitefly population below economic threshold level (ETL) up to 15 days. Pride 25 WP lowered the population mainly by suppressing the nymph population up to 10 days. Endosulfan 35 EC also provided a good early control and maintained it below ETL up to 7 days. Methamidophos provided the least control while maintaining the population up to 7 days below ETL. Key words: Bemisia tabaci Genn., cotton, efficacy of insecticides
