Influence of Constant Temperatures on Growth and Development of Pectinophora gossypiella (Saunders) in Bt cotton

The study on ’Influence of temperature on growth and development of P. gossypiella in Bt cotton’ was studied at various constant temperatures of 15, 20, 25, 30, 35 and 40°C) in Integrated Pest Management Laboratory, Department of Entomology, PAU, Ludhiana during kharif 2022-23. The results revealed that duration of all the larval instars were significantly lower at constant temperature of 35°C. The pupal duration, adult longevity and total developmental period of male and female were recorded significantly lower at 35°C. The fecundity and egg, larval and pupal survival was recorded highest at 30°C whereas at 40°C, no egg hatching and all the larvae experienced mortality. The larval and pupal weights were recorded highest at constant temperature of 35°C. The correlation was worked out where the developmentalparameters have shown significant negative correlation with constant temperatures. All the larval instars and male pupal weights show significant positive correlation with constant temperatures and female pupal weight, egg, larval and pupal survival show non-significant positive correlation with constant temperatures. Constant temperature dependant set with Stinner nonlinear and inverse second order polynomial model for the development of P. gossypiella.