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Azaleas with leaves near the bottom of the plant

Theses leaves have white spots on top of the leaves which are brown on the underside. What causes this and how do I correct it? The plants face north! Thanks for your help!

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1 Comment To "Azaleas with leaves near the bottom of the plant"

#1 Comment By Downtoearthdigs On 09/22/2017 @ 7:42 am

This sounds like a powdery mildew infection:

Here are some ways to treat powdery mildew:

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