Results of correlation studies revealed that, overall mean population of defoliators was significant and positively correlated with relative humidity-II. It is also evident from data that mean peak incidence of pest that the population of defoliators was at peak in38^th MW. When the mean weather parameters of 37^th week were maximum temperature (29.3 ⁰C), minimum temperature (20.25 ⁰C), precipitation (46mm), relative humidity I (81.95%) & humidity II (73.62%). Therefore it can be concluded that increase in relative humidity is causing significant increase in defoliators population and highest population density of the defoliators were observed during 37^th SMW which means the weather parameters during this period were most conducive for pest population.