Abstract
Chrysoperla cornea (Stephens) is one of the most important predators of the cabbage aphid, Brevicoryne brassica (Linn.) infesting cole crops in Himachal Pradesh. The biology of this chrysopid was studied under laboratory conditions on B. brassicae . Important morphological characters, body size, duration, etc., of different developmental stages, mating and oviposition behaviour are described. A single larva fed upon an average of 181 aphids in its life span of 12.08 days. A larva could wipe out aphid colonies with initial numbers of 50 and 100 aphids in 4 and 7 days, respectively, but failed to do so in colony with 200 aphids. Development from egg to adult was completed in 24.77 days during mid-May to end-July. The pupal period lasted for 7 to 9 days and the progeny had a sex ratio of 1.2:1 (female:male). The average fecundity was 66 varying between 36 to 123.
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