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Title: Leafspot of Black Cherry (Pest Alert)
Author: USDA Forest Service,;
Source: NA-PR-01-92. Newtown Square, PA:U.S. Dept. of Agriculture, Forest Service, Northern Area State & Private Forestry
Publication Series: Program Aid
Description: A leafspot caused by the fungus Blumeriella jaapii can damage black cherry seedlings in both forests and nurseries. The disease was formerly know as Coccomyces leafspot (from the genus of synonyms for the causal fungus). 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. Spots can enlarge and develop necrotic brown centers that sometimes drop out to result in "shot holes." 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.
Keywords: Fungus, defoliation, mortality.
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USDA Forest Service 1992. Leafspot of Black Cherry (Pest Alert). NA-PR-01-92. Newtown Square, PA:U.S. Dept. of Agriculture, Forest Service, Northern Area State & Private Forestry
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