Helpful Forestry Weblinks

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Click here to learn more about common tree diseases in our area (Courtesy of Morton Arboretum)


 tar spot

What is tar spot? Tar spot is a common, visually distinctive and primarily cosmetic fungal leaf spot disease.The Initial symptoms of tar spot are small yellowish spots that form on infected leaves. These spots may remain relatively small, or may enlarge over the growing season to roughly 3⁄4 inch in diameter.As tar spot progresses, the center of the infected area becomes raised and turns black. For more information click on the link below:




Galls are abnormal growths on plants that can result from the feeding of living organisms such as bacteria, fungi, nematodes, insects and mites. 

For more information click the link below:    




Anthracnose is very common on many types of trees and shrubs.
It often occurs on the leaves of ash and maple trees, causing
blotchy-brown dead areas. For more information click the link below.



Chlorosis  affects  the leaves and  turns them 
yellow, except for the veins, which remain green. In severe cases,
turn brown and die. Symptoms can occur on isolated branches, or
over an entire tree. For more information click on the link below:




Verticillium is a disease that shows symptoms on individual branches
that suddenly wilt and die. Affected branches may occur on one
side of the tree or may be scattered throughout the tree.
For more information click on the link below:




Lecanium are soft scales that are copious honeydew producers and their sticky excrement commonly coats automobiles, sidewalks, and park benches located under the branches of infested trees. 

For more information click on the link below: