FRUIT TREE AND ORNAMENTAL FRUIT TREE DISEASES
BLACK KNOT FUNGUS
This fungus affects plum trees, both fruit bearing and ornamentals. It also affects cherry trees.
It can be devastating, but with diligence, it can be dealt with. See the information at this website:
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In addition to removing the diseased portions from the tree at the proper time, fungicide sprays may be helpful, especially in the spring.
See the Homeowner Tree Care page and the Crabapple scab page.
Can affect apple trees, crabapple trees and pear trees. Pruning out the diseased parts and sometimes injections of antibiotics can be helpful.
Go to this webpage to learn more about this disease:
Copy and paste this link into your browser to read more about fireblight