Emerald Ash Borer Treatment
Proven trunk injection treatments to protect your ash trees from EAB. Licensed, certified, and effective.
Get a Free QuoteProtect Your Ash Trees Before It's Too Late
The emerald ash borer (EAB) has killed hundreds of millions of ash trees across North America since its discovery in 2002, and it is now confirmed throughout the I-94 corridor in Central Minnesota and the Twin Cities. Without treatment, EAB will kill an infested ash tree within three to five years. The good news: proactive treatment is highly effective and far less expensive than removal.
At Timber & Native, we use trunk injection treatments of emamectin benzoate, the gold standard for EAB protection. This treatment method has been extensively researched and proven to be over 99% effective when applied by a qualified professional. As both an ISA Certified Arborist and a Minnesota Licensed Pesticide Applicator (#20266038), Waylon has the credentials and experience to protect your ash trees.
Why Act Now?
EAB has been confirmed in Stearns, Sherburne, Wright, Anoka, and Hennepin counties. If you have ash trees on your property, they are at risk. Treatment is most effective when started before significant infestation occurs. Once a tree loses more than 40% of its canopy, treatment success rates drop dramatically.
What to Expect When You Work With Us
Assessment
Our ISA Certified Arborist evaluates each ash tree on your property, assessing health, size, location, and current EAB status to determine if treatment is appropriate.
Treatment Plan
We develop a customized treatment plan based on the number and size of your ash trees, their current condition, and the level of EAB activity in your area.
Trunk Injection
We apply emamectin benzoate via direct trunk injection, delivering the insecticide directly into the tree's vascular system where it is most effective against EAB larvae.
Monitoring & Retreatment
We monitor your trees and schedule retreatment every two years to maintain continuous protection against EAB.
Don't Wait Until It's Too Late
Schedule a free ash tree assessment today. Early treatment is the key to saving your trees.
Schedule EAB AssessmentThe Treatment, Step by Step
How We Treat Ash Trees for EAB
We protect ash trees with direct trunk injection of emamectin benzoate — the most effective, lowest-impact method available. Here is exactly what happens when our ISA Certified Arborist and Licensed Pesticide Applicator treats a tree on your property.
01 Staging the Injection System
Our ISA Certified Arborist measures each ash tree at diameter breast height (DBH) and meters the exact dose of emamectin benzoate for its size. A sealed, low-pressure injection kit is staged at the root flare — no spraying, no soil drench, and no drift onto your landscape.
02 Drilling the Injection Ports
Small, shallow ports are drilled into the trunk flare — the zone of fastest uptake into the tree’s vascular system. Spacing the ports evenly around the base ensures the treatment is carried to the entire canopy, not just one side of the tree.
03 Setting the Injection Plugs
Self-sealing plugs are seated into each port and connected to the dosing lines. This creates a closed system that delivers the insecticide directly inside the tree, keeping it away from pollinators, pets, and surrounding soil.
04 Direct-to-Vascular Delivery
The tree’s own vascular system draws the emamectin benzoate up into the canopy, where it kills EAB larvae feeding under the bark. A single trunk injection protects the tree for two to three years before retreatment is needed.
Frequently Asked Questions
How much does EAB treatment cost?
Treatment costs vary based on the size and number of ash trees on your property. Trunk injection treatments are typically priced by diameter at breast height (DBH). Contact us for a free on-site assessment and quote. In most cases, treatment is significantly less expensive than removal and replacement.
How often do ash trees need to be treated for EAB?
Trunk injection treatments using emamectin benzoate are effective for two to three years per application. We recommend retreatment every two years for optimal protection, especially in areas with confirmed EAB activity.
Is it too late to treat my ash tree?
It depends on the level of infestation. Trees with less than 30-40% canopy loss can often be saved with treatment. Trees with more severe decline may be too far gone. Our ISA Certified Arborist will assess your tree and give you an honest recommendation on whether treatment is viable.
What are the signs of emerald ash borer?
Early signs include thinning canopy (especially at the top), increased woodpecker activity, D-shaped exit holes (about 1/8 inch) in the bark, S-shaped larval galleries under the bark, and epicormic sprouting (new shoots growing from the trunk). If you notice any of these signs, contact us immediately.
Should I treat or remove my ash trees?
This depends on the tree's health, location, size, and value to your property. Healthy ash trees in good locations are almost always worth treating, as treatment costs a fraction of removal and replacement. Our arborist will help you make the right decision for each tree on your property.