author(s)
Meenu, KK Dahiya, Amit and Yogita Bali

abstract
The present study was conducted at Chaudhary Charan Singh Haryana Agricultural University, Hisar, Haryana (India). Present investigations revealed that the sucking pests (whitefly, leafhopper, thrips) remained active throughout the crop season with little differences among them. It was observed that the sucking pests remained active from 25^th to 41^st standard meteorological weeks (SMW i.e., June to October) during kharif 2016 and 2017.The data on the population/incidence of cotton whitefly revealed that whitefly did not crossed it's economic threshold levelon all the 6 genotypes of cotton during kharif 2016 while it crossed the economic threshold level during kharif 2017 in all the 6 cotton genotypes. The maximum adult population of whitefly was recorded at 32nd SMW during both the kharif seasons of 2016 and 2017. The maximum mean incidence was recorded in RCH-650 BGII during 2016 and2017. Mean leafhopper population, on all the six genotypes was ranged from 2.02-5.35 and 3.16-5.33 nymphs/leaf during 2016 and 2017, respectively. During 2016, the peaks were observed on 27^th and 29^th SMW, while peaks were recorded during 2015 in 26^th and 29^th SMW. Genotype HD-432 had 2.12 and genotype AAH-1 had 3.32 nymphs/leaf during 2016 and 2017, respectively. The thrips population was commenced at 25^th SMW during 2016 and 2017, respectively. The peak incidence of thrips population was recorded on 33^rd and 31^st during 2016 and 2017, respectively. All the sucking pests’ population was higher in Bt hybrids.