Annals of Plant Protection Sciences

The maximum population of Spodoptera litura was recorded 3.75 larvae/10 plants in 51^st during second year at a temperature range of 5.0 -23.6°C and Relative humidity 68.8% were recorded. The maximum larvae of Plutella xylostella were noted in 50^th SW during both the years at temperature range of 11.0–25.9°C and RH 64.4% in 2009–2010 and 7.3–24.0°C and RH 68.9% in 2010–2011. Pieris brassicae reached to its maximum in 5^th SW at temperature range of 7.1–24.9°C and RH 64.7% during 2009–2010 and 6.0–23.7°C and 70.5% RH with a population range of 0.33–2.58/10 plants during 20102011. Maximum population of Thysanoplusia orichalcea was recorded at which maximum temperature was 25.4°C and RH was 72.9%. All insect pests had negative correlation with minimum and maximum temperatures during both the years.