Developmental response of cabbage butterfly, Pieris brassicae L. (Lepidoptera: Pieridae) on different cole crops under laboratory and field condition.

摘要

An attempt was made to find out the developmental response of cabbage butterfly, Pieris brassicae on different cole crops under Laboratory and field condition. The overall development of P. brassicae was recorded significantly higher on yellow sarson (40.70+or-2.38 and 37.87+or-1.93 days) as compared to lower on cabbage (34.15+or-1.80 and 33.12+or-1.95 days), under laboratory and field condition, respectively (p<=0.05). All the developmental stages (egg, larval instars, prepupal and pupal) of P. brassicae was registered their maximum development period on yellow sarson followed by gobhi sarson, cauliflower and cabbage under both conditions. However, the maximum development period of adult was recorded on cabbage and minimum on yellow sarson in both situations. The cabbage butterfly tuned their highest generation mortality on yellow sarson (0.3565 and 0.3645) in contrast to lowest on cabbage (0.2555 and 0.2486) in both laboratory and field conditions, respectively. The number of adults was recorded maximum in laboratory than the field condition on all the cole crops. It is possible due to the presence of natural enemies (predators and parasitoids), abiotic factors (temperature, relative humidity and rainfall) and some unknown factors in the field condition.