Areas that are isolated and have not had winter rapeseed or related crops or host plants will usually exhibit lower levels of damage until CSPW populations build-up. Generalized seasonal populations of adult cabbage seedpod weevils in winter rapeseed in northern Idaho. Pests Aphids A complex of aphid species occurs on winter rapeseed. These include the cabbage aphid and turnip aphid. The actual impact of aphid feeding is still unknown and research is underway.
Natural predators are often important in controlling aphid populations.
Many other insect species can be found in winter rapeseed fields but they are generally considered minor pests. These include the flea beetles, cabbage worms, loopers, diamondback moth, lygus bugs and cabbage maggot. All, except for the cabbage maggot, have been found in winter rapeseed in northern Idaho. These insects should be monitored and evaluated as to their true pest potential. Currently no insecticides are registered for control of these pests in rapeseed.