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sounds like powdery mildew. More ventilation can help solve this, If it is powdery mildew then greencure can help rid you of it. be sure and have a good size fan going or thin your plant of a few FAN leaves
Baking soda itself isn't normally effective as a powdery mildew treatment, but when it's combined with liquid soap and water, it can be a powerful weapon. ... Combine one tablespoon baking soda and one-half teaspoon of liquid, non-detergent soap with one gallon of water, and spray the mixture liberally on the plants.
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