Q.Spots On Rhododendron Leaves
I have a pic if helpful

BushDoctor
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on August 3, 2021
This is, likely, a bacterial pathogen. This will require treatment. Copper fungicides will be best. Here is an article that will help:
https://www.gardeningknowhow.com/garden-how-to/info/what-is-copper-fungicide.htm
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