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Anthracnose
(fungus - Elsinoe veneta): A common cane and foliage disease of blackberry
and dewberry sometimes called dieback. The disease first appears in the spring
as small purplish spots on new shoots and purple bordered spots on leaves.
Spots on canes enlarge, usually develop an oval shape, and gradually turn
gray. Ends of badly infected canes die back. Erect types are less susceptible
than the more spreading types. Late dormant fungicide application will help
prevent infection.