Black Cherry A leafspot caused by the fungus Blumeriella jaapii can damage black cherry seedlings in both forests and nurseries.
Affected leaves bear spots that initially are purple.
In moist conditions, light-colored spore masses may ooze from fruiting bodies in these spots on lower leaf surfaces. As numerous spots develop, leaves can become chlorotic or necrotic and be prematurely shed. Defoliation of seedlings in forests is associated with mortality which might contribute to delays or failures of natural regeneration. Defoliation in nurseries can result in stunting that reduces numbers of acceptable seedlings. Range of spots, chlorosis, and necrosis on leaves from nursery seedlings.