How to Tell If Your Tree Has Emerald Ash Borer Damage
Emerald ash borer damage can spread through a tree before it becomes obvious, leaving homeowners unsure of what to look for. As the infestation progresses, trees begin to weaken, lose canopy coverage, and eventually decline beyond recovery if left untreated.
Valley Green Companies provides professional emerald ash borer treatment services to help protect ash trees across Central Minnesota. Recognizing early signs of damage can help homeowners take action before the problem becomes severe. Contact our team today to learn more about protecting your trees this season.
Thinning Canopy & Dieback
One of the earliest and most noticeable signs of emerald ash borer damage is thinning in the upper canopy. Leaves may appear smaller, sparse, or uneven, and branches often begin dying back from the top of the tree downward. This occurs because larvae feed beneath the bark, disrupting the tree’s ability to transport water and nutrients.
As the infestation progresses, this dieback becomes more severe and spreads throughout the tree. Monitoring canopy health each season is one of the most effective ways to detect early-stage damage.
Bark Splitting & Structural Stress
As emerald ash borer larvae tunnel under the bark, the tree may begin to show vertical splits along the trunk and branches. These cracks occur as the tree attempts to grow over damaged areas while internal stress continues to build.
Bark splitting is often a sign that the infestation is active and progressing. While the tree may still be salvageable at this stage, it’s important to act quickly before structural integrity is compromised.
Increased Woodpecker Activity
Woodpeckers are naturally drawn to trees infested with emerald ash borer because they feed on the larvae beneath the bark. If you notice increased pecking activity, bark flaking, or lighter patches on the trunk, it may indicate an underlying insect problem.
While woodpeckers can help reduce some larvae, their presence is usually a sign that the infestation is already established.
D-Shaped Exit Holes
Adult emerald ash borers leave behind small, D-shaped exit holes when they emerge from the tree. These holes are typically about the size of a pencil tip and can be found on the trunk or larger branches.
Seeing exit holes is a clear indicator that emerald ash borers are present and have completed part of their life cycle. At this point, a professional evaluation is strongly recommended.
When Emerald Ash Borer Treatment Is Effective
Treatment is most effective when trees still have a relatively full canopy and limited structural damage. Early to moderate infestations can often be controlled with professional treatment, allowing trees to recover and remain healthy for years.
Delaying treatment reduces the chances of success, which is why early detection plays such an important role in protecting ash trees.
Treat Your Ash Trees Before It’s Too Late
Emerald ash borer damage can progress quickly, but early detection gives you the best chance to protect your trees. With professional emerald ash borer treatment services from Valley Green Companies, homeowners can preserve healthy trees and prevent long-term decline.
Contact Valley Green today to schedule an evaluation and start emerald ash borer treatment before damage becomes irreversible.
