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The bionomics of cabbage leaf webber, Crocidolomia binotalis Zell. (Lepidoptera: Pyralidae)
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Crocidolomia binotalis Zeller is a pest of common cabbage, Chinese cabbage, cauliflower, radish, mustard, rape and kale. Its bionomics was studied in the laboratory. Rearing was carried out on common cabbage, Chinese cabbage and radish leaves at 25 C, 60-70% RH. The life cycle took about 30 days to complete, with larval, pupal and adult stages lasting 8.48, 9.76 and 8.33 days on common cabbage; 9.75, 6.84 and 4.53 days on Chinese cabbage; 11.7, 8.31 and 6.06 days on radish. The mortality of larval, pupal and emergence rate were 84.31, 66.67 and 36.84% on common cabbage; 90.57, 71.7 and 32.07% on Chinese cabbage; 80.77, 67.31 and 34.61% on radish. Leaf consumption area was 24.9, 30.3 and 31.3 cm2 respectively. Major characteristics of different stages were described. A thick tuft of long hair on the forewing and femure of male adult was recorded. The eggs were laid masses on the leaf blade, vein or petiole of lower surface of the leaves. Newly hatched larvae fed initially on the chlorophyll of young leaves and later on older leaves, buds and pods. Heavily infested plants were completely defoliated and contaminated with feces. Seedlings induced side tillers when attacked by this insect. About 20% of the plants were attacked according to our survey from July 1982 to October 1983, and from July-November a peak was reached. [AS/McLean]
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 Record created 2017-10-01, last modified 2019-03-04

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