rhododendron ailment - Knowledgebase Question

Silver Spring, MD
Avatar for carr94
Question by carr94
April 20, 2005
My rhododendrons have large brown spots on the leaves and some leaves have turned completely brown. What is likely wrong with them and what should I use to treat them?

Answer from NGA
April 20, 2005
Rhodies are prone to a fungal leaf spot so perhaps that's what's causing the problem. Fungal leaf spots are irregular in size and color; some have red-brown borders with silvery gray centers. Very small black dots (fruiting structures of the fungi) are sometimes visible in the center of the spot or in concentric rings. If this sounds like the damage on the leaves to your rhodies, remove and destroy the affected leaves and spray with a registered fungicide after flowering has finished. Repeat at 10-14 day intervals if weather is wet.

Best wishes with your garden!

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