How to Manage Pests
Pests in Gardens and Landscapes
Deep bark canker—Erwinia
The symptoms that characterize deep bark canker are the deep cracks running down scaffolds and trunks.
A reddish brown to dark brown substance oozes from these cankers from late spring through early fall,
giving them a "bleeding" appearance. Internally, dark brown to black streaks of varying width
extend through the inner bark and may run for many feet up and down the scaffolds and trunks of affected
trees. Numerous small, round, dark-colored spots extend into the wood beneath the cankered areas.
Keep trees healthy by practicing good water
management, fertilization, pruning, and pest control. These
management practices will also reduce canker development in infected trees and keep them in production
in most cases. Only trees growing in poor soils or particularly adverse conditions may never fully recover.
cracks and reddish brown sap