The fungus produces spores on fungal mats
beneath the outer bark. Spores carried by
picnic beetles start new infections as the beetle
interacts with fresh wounds on uninfected trees.
Unlike red oaks, white oaks rarely (if ever) produce spore mats.
Photo by Department of Plant Pathology

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Plant Disease Diagnostics
University of Minnesota, Yard and Garden Clinic
Developed (1999) and maintained by
Chad J. Behrendt, Ph.D. and Crystal M. Floyd

For plant disease questions contact the Yard and Garden Line Content Last Updated 09/07/00 View University of Minnesota Disclaimer