author(s)
Prasad R Shinde, UB Hole and SM Gangurde

abstract
An investigation was undertaken with an objective to study the seasonal incidence of pink bollworm under field condition at the Cotton Improvement Project, Mahatma Phule Krishi Vidyapeeth, Rahuri, (Maharashtra) for two years (2016-17 and 2017-18). The results indicated that the flower rosetting, green boll damage, pink bollworm larval population per 20 green bolls and locule damage in green bolls in non Bt cotton ranged from 1.07 to 28.01 per cent, 0.83 to 70.83 per cent, 0.17 to 22.00 larvae per 20 green bolls and 0.44 to 39.08 per cent respectively, while in Bt cotton, 1.77 to 15.73 per cent, 0.83 to 35.00 per cent, 0.17 to 10.50 larvae per 20 green bolls and 0.44 to 18.79 per cent respectively. The peak of flower resetting, green boll damage, pink bollworm larval population per 20 green bolls and locule damage in green bolls was observed during 46^th, 48^th, 48^th and 48^th MW, respectively in non Bt cotton, while in Bt cotton, flower resetting, pink bollworm larval population per 20 green bolls and locule damage in green bolls was observed during 47^th, 46^th and 47^th MW, respectively. However, the peak green boll damage was observed in 46^th, 47^th and 48^th MW.