Knowledgebase

Azalea leaf discoloration- fungus? #878986

Asked July 27, 2024, 9:41 AM EDT

I’ve noticed the leaves on my azaleas have gotten some darker spots on them since lat June and it’s seems to have gotten worse over the last few weeks with all the leaves covered. Any ideas what this is and how to treat?

Hennepin County Minnesota

Expert Response

Magnifying the photos shows white areas which look more like powdery mildew. These web pages describe several different problems that could be occurring. Treatments are included on most articles. 
https://apps.extension.umn.edu/garden/diagnose/plant/deciduous/azalea/spotsorblotches.html
https://hgic.clemson.edu/factsheet/azalea-rhododendron-diseases/
https://ask2.extension.org/kb/faq.php?id=822810
https://extension.umd.edu/resource/azaleas-and-rhododendrons-identify-and-manage-problems/
Plant Disease Clinic can diagnose for a fee.  https://pdc.umn.edu/

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