This question may have been covered before but here goes.The ARS site says:
Crown gall
(Agrobacterim tumefaciens) Overgrowths or galls form on stem and roots.
Infection occurs mainly through wounds. In soil. Bacteria spread in water.
Gall development is favored by rapidly growing host. Avoid injuring base of
plant and roots. Paint galls with Gallex to eradicate them
When one buys bare root plants and there is some slight damage to the
root, the recommended practice is to remove the damage. Isn't this a wound?
Why doesn't this action allow crown (root) gall to happen in almost every
rose planted??? I understand that the bacteria that causes gall is
ubiquitous in the soil.
Thanks in advance for any insight with this question.