Inspect the underside of tree bark for an S-shaped pattern.

Insecticidal Management for Your Ash Tree (Treatment Information) Entomologists agree that it is not necessary to begin treating your Ash tree for EAB before it is known to be within 15 miles of your tree.

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Treatment of a tree should begin once EAB has been confirmed near you. To find out where EAB has been confirmed in Illinois, Click here. May 03, Pruning: Ash trees only need pruning if you are trying to control its height or if the branches are dead, damaged, or diseased. Pruning a tall ash tree is a dangerous job and should be left to professionals. Winter: Even though ash trees are resilient to the cold, they can be affected by cold wind.

Wrapping your tree with natural burlap can help retain moisture and protect the tree from wind. Apr 05, If you notice defoliation of some branches, it may be a sign of anthracnose. Any signs of brown areas on leaves or cankers on the branches should be your call to start pruning back ash trees in the very near future.

These pests weaken the tree and can create serious problems if not addressed quickly by trimming back ash trees.

Avoid shearing shrubs into tight geometrical forms unless they need to be confined or trained for a specific purpose.

How to Prune Ash Trees. Feb 04, Pruning at this time can help to avoid certain diseases or physiological problems such as oak wilt in oaks, stem cankers in honey locusts, Dutch elm disease in elms, and fire blight in apple trees (includes flowering crabapples, mountain ash, and hawthorns).

Tree-trimming laws in Illinois help determine the legal rights of neighbors who have tree-related disputes. For example, under Illinois law, if the trunk of a tree rests on the property line that separates two homes, both homeowners have a legal right to trim or cut the tree but must first get permission from the other neighbor in order to do so.