Damage to infected plants results from interruption of water and nutrient movement up the stem. Galls also interfere with normal growth and development, therefore, infected plants may be stunted and unthrifty. With many plants, the amount of damage depends on where the gall or galls are located and how many are present. Death can result if galls girdle the primary trunk or stem. Infected plants are more sensitive to winter injury and drought stress.
Control is primarily dependent on prevention.
Pruning off galls is not effective since the bacterium is systemic and gall tissue can reproduce itself. Inspect plants for crown gall before purchasing. Plant only crown gall-free trees and shrubs. Remove and destroy heavily infected and weakened plants. Dig up as many roots as possible.