Seasonal Incidence of Insect-pests in Tomato (Lycopersicon esculantumM.) on Different Planting Dates and its Correlation with Abiotic Factors

Experiment conducted in the year 2010-2011 at experimental cum research farm, School of Agriculture Sciences and Rural Development, Nagaland University, showed that the incidence of aphids (Aphis gossypii) was observed at 52 nd , 2 nd and 4 th , whitefly (Bemisia tabaci) at 4 th , 7 th and 9 th , Serpentine leaf miner (Liriomyza trifolii) at 4 th , 7 th and 9 th and fruit borer (Helicoverpa armigera) at 9 th , 11 th and 13 th standard week on D 1 , D 2 and D 3 respectively.The incidence of aphid correlating with abiotic factors showed negative significant influence by maximum temperature at 4 th December planting date, whitefly showed negative significant influence on 4 th December planting date, leaf miner showed positive significant effect with maximum and minimum temperature in all the planting dates and also minimum relative humidity on 19 th December planting showed positive significant effect and in case of tomato fruit borer it showed a positive significant effect with maximum temperature and minimum relative humidity at 19 th November and 19 th December planting respectively.