Screening of cotton genotypes for resistance to sucking pests

Field studies were carried out to investigate the relative resistance of 346 cotton genotypes against sucking pests i.e. jassid, Amrasca biguttula and whitefly, Bemisia tabaci during 2003–2004. The jassid injury grade jassid and whitefly population/leaf was recorded on each genotype. The results revealed that lowest jassid population of 0.15 and 0.67 nymphs/leaf was found on CCH 510-4 (during 2003) and KR 13 (during 2004), respectively. The whitefly population was lowest at 4.17 and 2.85 adults/leaf on DHH 419 and GSHV 97/1092 during 2003 and 2004, respectively. Forty genotypes were found promising against the jassid and twenty five against the whitefly. H 1246 and hybrid LHH 1128 were resistant to jassid and whitefly, respectively in both the years. Ratna was the sole resistant to both the jassid and the whitefly.