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Nodular gall on forsythia stem. The cause is uncertain.

Uncertain cause of these galls has been attributed to Agrobacterium tumefaciens, a genetic disorder, Phomopsis sp., and Pseudomonos savastanoi. Credit: Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org<br />Licensed under a <a href="https://creativecommons.org/licenses/by-nc/3.0/us/">Creative Commons Attribution-Noncommercial 3.0 License</a>
Credit: Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org
Licensed under a Creative Commons Attribution-Noncommercial 3.0 License
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