RELATIVE RESISTANCE OF SOME COTTON VARIETIES AGAINST BOLLWORM COMPLEX AT DISTRICT SANGHAR, SINDH, PAKISTAN

Abstract

Cotton bollworms are an imperative insect pests of cotton which are not only responsible for yield reduction but also damages the lint quality by causing yellow spots on fibre that results in reduced market value of cotton. Therefore, this study with relative resistance of some cotton varieties against bollworm complex was designed. Nine cotton varieties were grown at farmers field Sanghar during 2014. The result showed that maximum pink bollworm population (0.92±0.20) was observed on CRIS-467 and minimum (0.52±0.15) on MNH-552. Maximum American bollworm population (0.92±0.20) was observed on IR-901 and minimum (0.48±0.15) on CRIS-467 variety. Maximum spotted bollworm population (0.80±0.19) found on CRIS-467 and minimum population (0.52±0.15) on MNH-552 per plant respectively. It was concluded from this study that MNH-552, IR901 and MNH-552 were resistant varieties against bollworms as compared to other cotton varieties.