Seasonal development
and life cycle—Deep bark canker
The pathogen that causes deep bark canker survives the winter in cankers or dried exudate on the tree
surface. The bacteria become active in late spring and begin to ooze from the cankers together with plant
sap. It enters the tree most often through wounds caused by equipment. High temperature favors the development
of the disease. | 
Black
streaks and pits of deep bark canker
|
