Diplodia canker (Sphaeropsis sapinea) of Abies concolor in Iowa.
A canker disease of A. concolor was found on branches in several windbreaks in Iowa during 1984-86. Symptoms included resin flow, sunken elliptical cankers and branch dieback. Diplodia pinea was identified as the pathogen. A host range study in the greenhouse confirmed pathogenicity of D. pinea on seedlings of A. concolor, Pinus nigra, P. resinosa and Picea pungens.