Carrie Lapaire, Purdue University
This symptom of densely clustered shoots is called witches' broom. It occurs on many herbaceous and woody ornamentals and can be caused by several organisms including fungi, insects, mites, phytoplasmas and viruses.
More information on other witches' brooms is available via the following websites:
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|Witches' Broom (Photos by Carrie Lapaire)|
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Last updated: 17 May 2002/tlm.
The Plant & Pest Diagnostic Laboratory at Purdue University.