Allorhizobium vitis

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Allorhizobium vitis (crown gall) symptoms on grapevine (click on image to enlarge it)
Author(s): Penn State Department of Plant Pathology & Environmental Microbiology Archives
Source: IPM Images

Allorhizobium vitis Mousavi et al. 2016 - (crown gall of grapevine)

The bacterium causes a wide-spread and serious disease of grapevine which can result in significant losses, especially in nurseries. The typical symptoms are tumorlike growth structures on the stem. The affected tissue dies and results in chlorosis, stunting, reduced yield and eventually plant death.

The disease agent enters the stem or a root through small wounds, e.g. those caused by freezing temperatures. Frost-tolerant cultivars are more resistant to the disease.

Vernacular names
• Deutsch: Mauke der Weinrebe
• English: crown gall of grapevine
• Français: broussin de la vigne

Agrobacterium vitis
Rhizobium vitis