Answer: It sounds like powdery mildew, a fungal disease. Are your plants getting 8 hours of sunshine a day? Do they have good air circulation all around? Powdery mildew is unusual in tomatoes, but it obviously does happen. You can try a fungicide or you can make your own by mixing: 1 tablespoon of baking soda and one-half teaspoon of liquid soap (not liquid detergent) into one gallon of water. Apply to the leaves of your plant. Best wishes with your tomatoes!
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