Abstract
The cabbage white butterfly, Pieris rapae crucivora BOISDUVAL, has been widely used as an experimental insect. However, there are some difficulties in mass rearing in the labortory though it is a common species. Especially in summer, many larvae die of granulosis virus disease when they are fed on cabbage heart leaves.KAMANO (1964) described artificial diets for rearing the cabbage armyworm, Barathra brassicae L. which contained some amount of fresh cabbage leaves cut finely. Recently, DAVID and GARDINER (1965, 1966) succeeded in rearing the large white butterfly, Pieris brassiae L. on semi-synthetic diets containing a small quantity of dried cabbage leaf powder. These results suggested the possibility of artificial rearing of Pieris rapae which also feeds on cabbage.For the photoperiodic research in Pieris rapae, some artificial diets with dried cabbage leaf powder and rapeseed oil were tested, and satisfactory results were obtained.
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