Impact of agroclimatic factors on pest population of summer brinjal

Abstract

One field experiment was to study the population dynamics of jassids and white fly in brinjal in relation to the prevailing weather conditions conducted at Regional Research Station, New Alluvial Zone, Nadia, West Bengal, India in the year 2017 during last week of March to last week of June. Numbers of jassids and white fly per leaf varied from 6.9 to 4.1 and 2.7 to 6.0 respectively. Results showed that jassid population was negatively correlated with the maximum air temperature (-0.44) and positively correlated with the minimum air temperature (0.27). On the other hand maximum air temperature showed positive association with whitefly population (0.14) while minimum air temperature (-0.10) had adverse effect on the numbers of white fly per leaf. Best-fit regression equations indicated that each weather factor exhibited polynomial relationship with the numbers of insect.