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Rhodo discoloration #343195

Asked July 15, 2016, 10:47 AM EDT

I am looking for an explanation for the brownish discoloration on the rhodo leaves. It occurs along the edge of the leaves as well as in discreet spots. I see it on all the rhodos in the yard. It is worst on the oldest shrub, which gets the afternoon sun.

Baltimore County Maryland

Expert Response

The leaf on the right is simply an old leaf.  Old leaves fall off of rhododendrons any time.  The one on the left has a leaf spot disease which we cannot diagnose from the photo alone.  The diseases that cause this kind of spotting do not kill the plant and are generally best ignored.  Check our diagnostic fact sheet for serious problems. http://extension.umd.edu/sites/default/files/_images/programs/hgic/Publications/HG51_IPM_Azaleas_and...  The following link has additional information.  http://cru.cahe.wsu.edu/CEPublications/eb1229/eb1229.pdf  vw
Answered by the Home & Garden Information Center's Maryland Certified Professional Horticulturists Replied July 15, 2016, 11:04 AM EDT

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