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It sounds like your petunias have a fungal infection called powdery mildew. It is spread by pathogens on the wind but rarely leads to death. The best thing to is to remove the infected parts and water the plants all over to wash of the spores. The only preventative care is to maintain a healthy plant that can resist infection. But before you take action, I suggest you do some research into powdery mildew on petunias to double check what it is.

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8y ago
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9y ago

Petunias can get powdery mildew if they are kept too wet.

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Q: What is the powder on a petunia?
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