Abstract
Erioischia brassicae is an important pest of cultivated brassicas, ovipositing in the soil close to host plants. Since all previously known host plants have been confined to the family Cruciferae1 in which mustard-oil glucosides are characteristically present2, it is of importance to know if these chemicals play a part in stimulating the flies to oviposit in the vicinity of the host. It has been shown that among pests of Cruciferae, Plutella maculipennis (Curt.) was stimulated to oviposit by a mustard oil3, and Pieris brassicae L. by an aqueous solution of a mustard-oil glucoside4; with both pests, however, the rate of oviposition was much lower than that on host-plant material.
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