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Gray Leaf Spot

 

Foliage of plants from seedlings to mature plant stage is affected. Brown to black specks appear on both the young and older leaves. The lesions expand slowly into 1- to 2-mm-diameter round spots that remain brown or develop a gray center surrounded by a yellow area. Fungicides will control the spread of the disease. To prevent tomatoes from becoming disease, avoid overhead watering and let plants dry before nightfall.