Toxicant Efficacy of some Insecticides against Whitefly, Bemesia tabaci under Cotton Field Conditions at Khairpur-Sindh

The research study was carried out at district Khairpur - Sindh during, 2015 to investigate the efficacy of different insecticides against whitefly, B. tabaci with five treatments and replicated four times on cotton crop. All the tested insecticides reduced the mean percent population of whiteflies even at 12 day after spray. The insecticides namely; Pyriproxyfen was found more effective comparatively to th Acetamaprid which found to be lesser effective. Pyriproxyfen insecticide showed the overall reduction (67.31±1.27%) in overall sprays when compared with the control (un-sprayed) plot. The second insecticide Nitenpyram was observed with the overall reduction (63.39±1.56%) followed by Diafenthiuron (61.46±2.10%), Acephate (59.55±2.48%) and Acetamaprid (48.16±2.87%) when compared with control plot (8.00±0.37) , respectively thus; the analysis of variance showed the significant difference among all insecticides. It is concluded that only Pyriproxyfen proved the better results up to 7th day among these insecticides those provided the significantly different results therefore, it is suggested to be applied due to egg controlling of B. tabaci on the cotton leaves.