There are stem spots. This affects green and ripe fruit. This disease progresses quickly, so it is important to prevent it, and to look for it early and often. The fungus overwinters in cull piles, volunteer plants, and potato seed tubers. Make sure that cull piles are as far away as possible, and no volunteers of tomatoes or potatoes are left in the fields.
Plant tomatoes as far as possible from potatoes.
Scout frequently and in the early morning when leaves are still wet. Resistance is available for this disease. See current recommendations for chemical control measures. By Pamela S. Mercure, IPM Program Assistant, University of Connecticut References. Proceeding of the New England Vegetable and Berry Conference.