Powdery mildew is a common problem in areas that have high humidity and it can affect almost any type of plant. If left untreated, it can turn more severe, causing leaves to turn yellow or brown. One powdery mildew homemade prevention tactic is to simply prune back any dead plant material, and another is to avoid using the sprinklers in the evening, so the water doesn’t stand on the leaves too long. Another good idea is organic removal by using dilute solutions of hydrogen peroxide and spray it on the plants thoroughly about once a week.

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Source: Gardening Know How