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:

https://extension.psu.edu/plum-disease-black-knot

Copy and paste the web address link into your browser.  

In addition to removing the diseased portions from the tree at the proper time, fungicide sprays may be helpful, especially in the spring.

SCAB

See the Homeowner Tree Care page and the Crabapple scab page.

FIREBLIGHT

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:

https://extension.umn.edu/plant-diseases/fire-blight#pesticides-1760463

Copy and paste this link into your browser to read more about fireblight