How do I remove black spots on azalea?
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Hi, this video will show you how - https://www.youtube.com/watch?v=xwlbK0gZkPw
Here's an article that might help you - https://homeguides.sfgate.com/encore-azaleas-leaf-fungus-36823.html
Sounds you might have a fungus. Try spraying with a bit of baking soda and warm water. Do this in the shade, not full sun. Leave about 15 minutes and then hose off again.
I think this site can help you also: https://www.gardenguides.com/info_7906838_black-spots-azalea-leaves.html
Try thinning out the shrub to permit better air circulation and sunlight to interior sections.