Whether you're picking out a tree for your landscape or making a list for this season's to-dos, we have your tree care questions answered.
Invasive Pest Alert for Illinois: Elm Zigzag Sawfly
May 1, 2025
The elm zigzag sawfly, an invasive species, is targeting elm trees in the Chicago region. Most trees recover from this pest, but weakened and stressed trees are at risk.
Plant Health Care
What Are These Green Spots on My Tree’s Trunk or Branches?
May 9, 2022
Do you have green fungus on tree branches or green spots on your tree bark? Learn more about tree bark fungus identification and treatment. Often, you’ll see moss, lichen, or algae. None of which hurt the tree, but learn how you can get rid of lichen (if you do it right).
Trimming & Pruning
Tree Branches Hanging Over Or Touching Roof? Do This…
February 7, 2022
Have you noticed tree branches touching your roof? Or perhaps a neighbor’s tree is touching your house? Learn how to cut a limb safely and solve the problem.
Plant Health Care
Signs & Symptoms Of Tree Stress (Plus Treatment)
September 12, 2022
Learn the signs of symptoms of a stressed tree including tree stress after planting, and signs of drought stress in trees. Then discover treatment for tree stress.
Trimming & Pruning
How to Prune or Trim Young Trees for Structure and Form
June 14, 2021
Wondering if you should prune your young tree? Find out how and when to prune your trees.
Davey Knowledge
Mushrooms Around Trees: What Missouri Homeowners Should Know
October 16, 2026
Seeing mushrooms around your tree? Learn what fungi can reveal about root health, decay, and tree stability in Missouri—and when it's time to call a certified arborist.
Property Maintenance & Landscaping
How Long Do White Fluffy Seeds Last on Cottonwood Trees?
May 9, 2022
Those white fluffy seeds in the air in spring are cottonwood seeds! But how long does cottonwood season last? Cottonwood trees shed cotton for several weeks from late spring to early summer. But can you stop them from producing cotton? Here's how to reduce or stop it entirely.
Insect & Disease Issues
How to Get Rid of & Treat Aphid Infestations in Large, Tall Trees
August 23, 2022
See little critters on your maple tree leaves? Or maybe their honeydew left sticky leaves on your outdoor plants? Sounds like aphids! Get rid of them by...
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