Azaleas with leaves near the bottom of the plant

Question

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!

Answer 1

This sounds like a powdery mildew infection:
https://www.gardeningknowhow.com/ornamental/shrubs/azalea/common-azalea-problems.htm

Here are some ways to treat powdery mildew:
https://www.gardeningknowhow.com/plant-problems/disease/powdery-mildew-homemade-and-organic-remedies.htm
https://www.gardeningknowhow.com/plant-problems/disease/get-the-cure-for-powdery-mildew.htm