Infected branches appear discolored with brown streaking
in the sapwood. The brown staining is
an accumulation of host defense compounds.
Photo by Chad J. Behrendt

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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