Cultural studies were made of 348 bur oak branches inoculated with white and gray isolates of Ceratocystis fagacearum at diametrically opposed loci. Approximately 15 per cent of the branches developed foliar symptoms of oak wilt, yielded C. fagacearum, or both. More than one-third of the visibly diseased branches did not yield this fungus. Part of the failures were attributed to competition from other fungi and bacteria, isolated commonly from wood of both inoculated and uninoculated branches. No branches yielded both isolates of the pathogen. Distribution of the two isolates among trees indicated preferential susceptibility of the host may contribute to the apparent competition in vivo among isolates of C. fagacearum.
Proceedings of the Iowa Academy of Science
© Copyright 1962 by the Iowa Academy of Science, Inc.
Marchetti, M. A.
"Infection of Quercus Macrocarpa by White and Gray Isolates of Ceratocystis Fagacearum,"
Proceedings of the Iowa Academy of Science: Vol. 69:
, Article 18.
Available at: https://scholarworks.uni.edu/pias/vol69/iss1/18