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Mountain Laurel Diseases

Informational table showing disease name, symptoms, pathogen/cause, and management of Mountain Laurel diseases.
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Updated:
August 30, 2023
Mountain laurel, Kalmia latifolia—bright pink. Photo: Sandy Feather, Penn State

Mountain laurel, Kalmia latifolia—bright pink. Photo: Sandy Feather, Penn State

Disease Symptoms Pathogen/Cause Management
Leaf spot Large, tan to brown spots on leaves have a dark line on their perimeter and a purple halo. Dark-brown, pimple-like fruiting structures are scattered within the spot. Cercospora kalmiae Avoid overhead irrigation. Apply a fungicide.

photo of Cercospora leaf spot
Cercospora leaf spot.

photo of virus symptoms on Kalmia
Virus symptoms on Kalmia (identity of virus, unknown.)

Gary W. Moorman, Ph.D.
Professor Emeritus
Pennsylvania State University
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