Emerald Ash Borer Treatment in Cokato & Central Minnesota

The Emerald Ash Borer (EAB) is an invasive beetle that attacks all species of ash trees, boring beneath the bark and cutting off the flow of water and nutrients. Once infested, trees can die within just a few years if left untreated.

TreeTec offers professional Emerald Ash Borer treatments across Central Minnesota, helping homeowners and property managers protect valuable shade trees before it’s too late.

All treatments are applied by our ISA Certified Arborist, ensuring precision, safety, and proven results.

Why EAB Treatment Matters

Emerald Ash Borer infestations are spreading rapidly through Minnesota, killing tens of thousands of trees each year. Once symptoms appear, the clock starts ticking—early detection and treatment make all the difference.

Professional EAB treatments help:

• Stop active infestations and prevent further spread
• Protect healthy ash trees before damage begins
• Preserve shade and curb appeal on your property
• Avoid costly removals or property damage from dead trees

The best defense is preventive care—treating before visible symptoms appear.

How Emerald Ash Borer Damages Trees

Adult beetles lay eggs on the bark, and larvae tunnel beneath the surface, feeding on the tree’s vascular system. Over time, this internal damage:

• Blocks nutrient and water flow
• Causes canopy thinning and leaf loss
• Creates bark splitting and D-shaped exit holes
• Eventually kills the tree

Even seemingly healthy ash trees can already be infested, which is why proactive inspection and treatment are critical.

Signs of Emerald Ash Borer Infestation

If you see any of the following symptoms, contact TreeTec immediately for an inspection:

• Thinning or dying canopy (especially upper branches)
• Vertical bark cracks or splits
• D-shaped exit holes (⅛ inch wide)
• Small shoots or sprouts growing from the trunk base
• Woodpecker damage (flaking bark)

Our Arborist can confirm EAB activity and recommend the appropriate next steps.

Our Treatment Process

TreeTec uses professional-grade trunk injection treatments, which deliver systemic insecticide directly into the tree’s vascular system—no spraying, no drift, and no risk to surrounding plants or pollinators.

1. Inspection & Diagnosis – Our Arborist confirms EAB activity or risk through a detailed evaluation.
2. Treatment Recommendation – We determine whether the tree can be saved and choose the right injection protocol.
3. Trunk Injection Application – Precise dosage is injected at the base of the tree for full coverage.
4. Monitoring & Follow-Up – We recheck progress and recommend retreatment intervals (typically every 2 years).

This direct-delivery method is both fast and highly effective, protecting treated ash trees for multiple growing seasons.

When to Treat for EAB

The best time to treat for Emerald Ash Borer in Minnesota is typically late spring through early summer, when trees are actively moving nutrients and treatments are most effective.

We recommend preventive injections for all ash trees within known infestation areas—even if they appear healthy. Once canopy loss exceeds 30–40%, treatment is often too late.

Cost of EAB Treatment

Treatment costs vary by tree size and number, but TreeTec provides clear, upfront pricing before any work begins. On average:

• Small trees (under 12” trunk diameter): $75–$125 each
• Medium trees (12–20” diameter): $125–$200 each
• Large trees (20”+ diameter): Priced individually

We offer multi-tree discounts and neighborhood treatment programs for HOAs or city blocks with multiple ash trees.

Why Choose TreeTec for EAB Treatment

• ISA Certified Arborist performing and supervising all treatments
• Proven injection system with industry-leading effectiveness
• Eco-safe methods—no spray drift or soil contamination
• Locally owned and operated in Cokato, MN
• Honest assessments—if a tree can’t be saved, we’ll tell you upfront

We’ve helped Central Minnesota homeowners preserve hundreds of ash trees through targeted, effective treatments.

Our Service Area

TreeTec provides Emerald Ash Borer treatment and diagnosis throughout Cokato and Central Minnesota, including:
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Dassel • Howard Lake • Cokato • Delano • Buffalo • Waverly • Hutchinson • Annandale • Wayzata • Chanhassen • Full Service Area List

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If you’re within about 45 minutes of Cokato, we can inspect and treat your ash trees quickly and safely.

Related Services

• Tree Disease Diagnosis – Identify other causes of leaf discoloration or dieback
• Tree Health & Risk Assessment – Evaluate overall tree stability and strength
• Tree Removal – Safe removal of unsalvageable or dead ash trees
• Tree Trimming – Maintain canopy structure and encourage regrowth

FAQs About Emerald Ash Borer Treatment

Can EAB be completely eliminated?
No, but early treatment can stop active infestations and protect healthy trees.

How often do trees need to be treated?
Most require re-treatment every 2 years, depending on infestation levels and site conditions.

Is trunk injection safe for pets and pollinators?
Yes. The injected product stays inside the tree—no external residue or drift.

Can a tree be saved once it shows symptoms?
Often, yes—if less than one-third of the canopy is gone, treatment can still be effective.

Do you offer group or neighborhood rates?
Yes, we provide discounted rates for multiple trees on the same property or nearby locations.

Protect Your Ash Trees with Professional EAB Treatment

Don’t wait until it’s too late. Call (612) 472-8733 or contact TreeTec online for Emerald Ash Borer treatment in Cokato and Central Minnesota.

Our ISA Certified Arborist provides targeted trunk injections that stop infestation, protect healthy trees, and extend the lifespan of your ash canopy.