Answer: Your tomato disease could be powdery mildew (rare on tomatoes) or a simple case of gray mold. In either case, the problem can be minimized by making sure the plants get plenty of air circulation and avoid getting water on the foliage or stems. You can use a sulfur based fungicide but if the temperature is over 95F the leaves can burn. Lilly Miller Sulfur or Ortho Flotox 90% are registered for use on tomatoes. Be sure to follow label directions.
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