author(s)
K Sasikumar and K Rathika

abstract
The study was conducted for preliminary screening trial of 67 cotton genotypes with check entries NDLH 1938 (Leaf hopper resistant), DCH 32(Susceptible to leafhopper and bollworm) and Bt Jadoo BG II (Bollworm resistant) for relative susceptibility/resistance against leafhopper, Amrasca biguttula biguttula (Ishida) laid out in Cotton Research Station, Srivilliputtur under All India Co-ordinate Cotton Improvement project (AICCIP on Cotton) during 2019-2020. Among the 67 genotypes screened, 9 genotypes were found to be highly resistant (LHIG1), 29 genotypes were categorized as resistant (LHIG 2), 25 genotypes Susceptible (LHIG 3) and 4 genotypes highly susceptible against leafhopper with a population ranged from 0.57 to 3.57, 0.63 to 3.97, 1.43 to 4.90 and 3.93 to 5.83 leafhopper/3 leaves/plant respectively based on the standard deviation value.