Informational table showing disease name, symptoms, pathogen/cause, and management of Mountain Laurel diseases. 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.

Cercospora leaf spot.

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