Pennsylvania State University College of Agricultural Science Plant Patholgoy
Pennsylvania State University College of Agricultural Sciences College of Agricultural Sciences

Plant Disease Facts
Gary Moorman
Professor of Plant Pathology
Hackberry Diseases

Disease Symptoms Pathogen/Cause Management
Witches' Broom Many short twigs develop close together from a swelling on a branch. The tree may be covered with witches' brooms. Sphaerotheca phytophila (a powdery mildew) and an eryophyid mite (Eriophyes celtis) Remove unsightly trees.


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Last modified Monday, May 19, 2008
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