Crown gall—Agrobacterium
tumefaciens
Trees infected with crown gall have rough, warty tumors on large roots near the crown. Galls first appear
as smooth swellings and develop rapidly into large tumors with a rough, warty, or cracked appearance.
On blackberries, raspberries, and grapes, galls may also form on stems.
Life cycle
Solutions
You can greatly reduce problems with crown gall by obtaining planting material from a reputable nursery.
Examine trees and vines before purchase. Avoid injury or pruning wounds that will come into contact with
soil. Rinse soil away from the area before pruning. | 
Swollen
outgrowths found near base of vine
Galls
on roots
|
