Lonsdalea quercina

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symptoms of drippy blight (Lonsdalea quercina), in Colorado, this bacterial disease has an undefined association with the kermes scale Allokermes galliformis (click on image to enlarge it)
Author(s): Whitney Cranshaw
Source: IPM Images

Lonsdalea quercina (Hildebrand and Schroth 1967) Brady et al. 2012

The bacterium causes bark canker, dieback and drippy nut on oak as well as similar diseases on other plants in various regions. Lonsdalea quercina subsp. populi infects poplar. The bacterium is Gram-negative and facultative anaerobic.

Synonyms:
Brenneria quercina
Erwinia quercina