Abstract:The present investigation was carried out to study the seasonal activity and their relation with weather parameters of thrips infesting bitter gourd during
rabi-summer season of 2017-18 at Centre of Excellence for Mango, College of Agriculture, Dapoli, Dist. Ratnagiri (M.S).
Results revealed that there were marked differences observed in infestation of thrips. The population of thrips (4.60 ± 1.05) was noticed in the 13th SMW (26th March - 1st April). Minimum thrips population (1.00 ± 1.05) was recorded in 23rd SMW (5th - 11th June), while maximum (4.60 ± 1.05) population was recorded during 13th SMW (26th March - 1st April). The data on correlation between mean population of thrips infesting bitter gourd and different weather parameters revealed that the minimum temperature was found to be negatively significant with thrips population while remaining all the meteorological parameters viz., maximum temperature, morning relative humidity and evening relative humidity were found to be non-significant.