author(s)
Bimal Mondal, Palash Mondal and Manas Patra

abstract
Seasonal abundance of chilli aphids initiated on or before 3^rd week of January and chilli thrips initiated on or before 4^th week of January at early stages of the crop. Aphid population build up gradually increased and attained at peak on 4^th week of February and remained high till 3^rd week of March. Thrips population was high in the field in 9 to 11 Meteorological Standard Weeks (MSW). In the present investigation, population fluctuations of chilli aphid affected mainly by three weather parameters as this was evident from the negative correlation with minimum temperature (r=-0.141), rainfall (r=-0.474) and relative humidity (r=-0.454). However, relative humidity (r=-0.616*) showed significant negative correlation in the population fluctuation of chilli thrips. Results on multiple regression analysis revealed that 31.3% (R²= 0.312) variation in aphid population was happened due to the abiotic factors while it was 45.4% (R²= 0.0.454) for thrips population.