Canker Stain (fungus)


You will see sparse foliage, small leaves, and sunken cankers on the trunk and larger branches. The canker may at first just appear to be a darkened, flattened area on the wood. Beneath the cankers, the wood is stained bluish black or reddish brown in a extending toward the center of the trunk or branch. As the disease progresses and cankers enlarge, water sprouts develop below the cankers