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Blueberry: Crown gall

Crown gall

Infection by the crown gall, bacterium Agrobacterium tumefaciens, results in abnormal swelling of canes and stems.

Blueberry branch with large, brown, fibrous swelling along entire length.
Large gall on blueberry cane. Photo courtesy W. Bertram.

 

Blueberry stem with bark scraped off to show multiple small brown bumps developing underneath bark.
Smaller galls erupting from under bark. Photo courtesy W. Bertram.

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