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Anomalous dark rings found in black cherry (Prunus serotina Ehrh.) sawlogs have been anecdotally related to defoliations from cherry scallop shell moth (CSSM) (Hydria prunivorata Ferguson). Using six timber harvest sites on the Allegheny National Forest and a thinning on the Kane Experimental Forest in northwestern Pennsylvania, we documented the occurrence of dark rings in the 1970s, 1980s, and 1990s, concurrent with historical CSSM defoliations. Thirty cross-sections sampled from sixdoi:10.1093/forsci/fxy057 fatcat:huzdprohtjdwzlzdeu35deu4w4