Abstract
Sphaeropsis sapinea (Fr.) Dyko and Sutton [=Diplodia pinea (Desm.) Kickx.] is a pathogen of conifers causing damage to forest, ornamental and nursery trees throughout the world (Gibson, 1979; Palmer and Nicholls, 1985; Peterson, 1977). Recently isolates of S. sapinea from the north central United States were assigned to two categories on the basis of cultural characteristics, isozyme patterns and virulence tests (Palmer, 1985). Type A isolates have fluffy white to grey-
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