Crown Gall of Grape
Allorhizobium vitis
Grapebacterial
A bacterial disease producing tumor-like galls at the crown and graft union, often following winter injury.
Symptoms
Rough, tumor-like galls at the crown and graft union, with decline and dieback in severe cases.
Favorable conditions
- •Trunk injury from freeze cracks or cultivation wounds
- •Infected planting material
Management
- 1Use certified clean planting material
- 2Avoid trunk injury
- 3Biological control agents can help suppress the bacterium
Back to the disease library