author(s)
Bimal Mondal, Palash Mondal, Ayan Das and Kunal Bhattyacharyya

abstract
Tomato (Lycopersicon esculentum Mill.) is one of the most popular and commercially important vegetable crop cultivated throughout the India. Among the factors responsible for the lower yield, insect pests are the major one. The results revealed that the population of aphid initiated on second week of January while it disappeared from end of March. Among abiotic factors rainfall (r= -0.104) showed negatively non-significant effect on aphid population build up. Population of white fly initiated on first week of February while the population disappeared from 15^th standard week onward. Correlation of weather parameter with white fly population revealed non-significant effect against maximum temperature (r=-0.010) and rainfall (r=0.007). In case of tomato fruit borer, population initiated in the 7^th standard week and disappeared on 15^th standard week in the year. However, rain fall (r= -0.208) showed negatively non-significant correlation with H. armigera population build up. The percentage contribution of all the weather parameters over H. armigera population was 18.6% (R²= 0.186). The higher natural enemy population were found simultaneously with higher insect pest population recorded in field i.e. during February to March.