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Disease on rhododendron #865816

Asked April 24, 2024, 10:16 PM EDT

Can you tell what is damaging my rhododendron and camellia plant. Thanks I live in zone 8 West Linn OR

Clackamas County Oregon

Expert Response

Thank you for your question, MaryAnn. A fungus-like disease called Ramorum leaf blight affects both of these species, but a lab exam would be necessary to confirm. (https://pnwhandbooks.org/plantdisease/host-disease/rhododendron-ramorum-leaf-blight-shoot-dieback). I suggest that you submit leaf samples to the OSU Plant Clinic for a diagnosis: https://bpp.oregonstate.edu/how-submit-plant-materials

Good luck!

An Ask Extension Expert Replied April 25, 2024, 2:20 PM EDT