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Red spots on azalea leaves

Diseased azalea leaf
Diseased azalea leaf in Lexington, MA


I have reddish spots and irregular areas on some of my azalea leaves. Is this likely to be Colletotrichum Azaleae?  Could it be something else?  What causes it and how can I treat/eliminate it?  Thank you for your assistance.

Lexington, August 2014


You might want to take a look at a UMass Extension fact sheet that covers your question and makes suggestions relative to  causation and treatment. I think that you are quite likely correct in your diagnosis, and fortunately, causation and treatment seems relatively straightforward.