When the branches of your trees and shrubs are bare in winter, you have an opportunity to spot cankers that might be hidden by leaves in summer. A canker is an area of disease in the wood of a plant.

I read that hypoxylon canker is killing thousands of oaks that have been stressed by severe drought. I have a ranch about 30 ...

In susceptible trees and shrubs, the fungus may attack the smallest twigs and later spread to larger branches where they cause cankers. Symptoms: Discoloration and death of leaves on individual stems ...

Alan Buckingham, author of Allotment Month By Month, advises in his book that gardeners should inspect their apple and pear trees for signs of canker and remove any infected wood immediately.

Cytospora canker generally appears on the lower branches first and then progresses up the tree. Individual upper branches may show these symptoms as well (as you are seeing in your blue spruce).

Old Wolf Oak at Ponca State Park, one of Nebraska’s oldest trees, has died, according to Nebraska Game and Parks. The bur oak ...

This tree is infected with the fungal pathogen that causes Pine Ghost Canker, which can be fatal for trees. (Akif Eskalen, UC Davis) Fungal pathogens that cause die-back in grape, avocado, citrus, nut ...

these trees can very quickly develop limb dieback or cankers. In many cases, cankers become more obvious during these periods of stress because they were already present before the drought stress ...

Cytospora canker, a fungal disease, can also cause oozing on stone fruit trees. Unlike the greater peachtree borer, Cytospora canker oozing can occur in the upper trunk and branches. The disease ...

Jillian Patrie | University of Minnesota Yard and Garden Extension ...