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    Cabbageworms (Pieris Species)

    Figure 19. Imported Cabbageworm Larva

    Photo by Roy Ellis

    Two cabbageworm species are commonly found in canola fields-the imported cabbageworm (Figure 19) and the western cabbageworm. Imported cabbageworms are green with a velvety texture, and have a faint yellow stripe down their backs. Imported cabbageworm also attack cabbage. The western cabbageworm has brilliant blue and yellow stripes down its back. The adult stages of both species are white butterflies that fly by day. There are two or three generations per year. The cabbageworms feed on leaves but do not cause economic losses.