I'm not sure of the problem I have with a bunch of azaleas. The top of the leaves get a whitish cast, then they become reddish brown. The underside of the leaves have small black spots, but I don't see bugs, just spots. The leaves eventually turn brown, losing their green color. Is this mildew, or lace bugs, or a third issue? I'm just not sure. Any advice would be greatly appreciated.
Certified GKH Gardening Expert
The following article should be of some help in pinpointing the likely cause: https://www.gardeningknowhow.com/ornamental/shrubs/azalea/common-azalea-problems.htm