Abstract
The study was conducted at Nuclear Institute for Agriculture and Biology (NIAB) Faisalabad. There were eight cotton varieties namely NIAB Karishma, Karishma-1, Karishma-2, FH-901, MNH-554, N-86, N-98 and CIM-482. The experiment was conducted to study the effect of abiotic factors against the infestation of pink bollworm and also determine co-efficient of correlation among different variables considering the role of abiotic factors and the role of nectarid and nectariless cotton varieties under unsprayed condition. The pink bollworm infestation negatively correlated with abiotic factors like Temp. (0C), R. H. (%) and rainsfall (mm) in both nectarid and nectariless cotton. However nectariless cotton less attacked as compared to nectarid cotton varieties. High level of pink bollworm infestation was observed during October, when the infestation level on nectarid cotton was 16.07% on flowers, 8.99% on squares and 11.43% on green boils, and temperature ranges (28.31-30.08)oC and relative humidity ranges from (46.91-53.50)% and there was no rain fall during October. Key words: Pink bollworm infestation, abiotic factors, cotton
