Galls may be produced on canes, trunks, roots, and cordons and may grow to several inches in diameter. Internally galls are soft and have the appearance of disorganized tissue.
Galls commonly develop where plants have been suckered or injured during cultivation or pruning.
The pathogen can be transmitted by any agent that contacts the contaminated material. In areas where winter injury to the vines occurs, chemical treatments may be effective. Agrobacterium radiobactor does not provide effective control of this pathogen on grape. The Regents of the University of California. All rights reserved.