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The major biotic constraint in Bt cotton is the occurrence of sucking pests to attain absolute yield potential from Bt cotton hybrids. The cotton leaf hopper, Amrasca devastans (Distant) (Homoptera: Cicadellidae) is posing a serious limitation to seed cotton yield which occur throughout the crop growth period in Andhra Pradesh. The leafhoppers can cause 21.2 per cent loss in yield (Bhosle et al., 2009) and can reduce upto 309 kg/ha in quantity of seed yield (Murugesan and Kavitha, 2010). Farmers mostly depend upon insecticides belonging to different groups to keep the crop free from leafhoppers and other sucking pests.

Insecticide Resistance in Field Population of Cotton Leaf Hopper, Amrasca devastans (Dist.) in Guntur, Andhra Pradesh, India