author(s)
Shrinivas, AG Sreenivas, SG Hanchinal, Sujay Hurali and RV Beldhadi

abstract
The study of biology of pink bollworm was carried out in the Climate Change Laboratory, University of Agricultural Sciences, Raichur during 2017-18 in BOD incubator under controlled conditions of temperature, 27±2°C and relative humidity of 65±5 per cent wherein the larvae were reared on Bt cotton bolls and okra fruits. Considerable variation in larval period of Pectinophora gossypiella (Saunders) feeding on different host plants was recorded. The shorter larval period of 23.50± 1.45 days was recorded when the larvae were fed okra fruits, whereas the longer larval period of 26.10±0.66 days was observed on Bt cotton. Generally, female lived longer than males in the present study on both the hosts. The females that were fed on okra laid maximum number of eggs (125.95 eggs/female) as compared to those on Bt cotton (103.8 eggs/female). The total life cycle of P. gossypiella from egg to death of adult varied on two hosts, which was significantly longer on Bt cotton (46.82 days) than on okra (40.58 days).