Emerald Ash Borer:

What Homeowners Need to Know & How It’s Treated

Protecting Your Ash Trees in the Denver Metro Area

The emerald ash borer (EAB) is an invasive insect that has devastated millions of ash trees across the United States. Since its first detection in Boulder, Colorado, in 2013, EAB has continued to spread, posing a severe threat to the Denver metro area’s urban canopy. Without proper intervention, infested ash trees can decline rapidly, leading to hazardous conditions and costly removals.

If you have ash trees on your property, understanding the risks, symptoms, and available treatments for EAB is crucial to preserving your landscape and avoiding unnecessary damage. Keep reading to learn how Keep It Green Tree Care can help you safeguard your trees from this destructive pest.

What is the Emerald Ash Borer?

The emerald ash borer (Agrilus planipennis) is a small, metallic green beetle native to Asia. It attacks all species of North American ash trees by laying eggs under the bark. Once hatched, the larvae tunnel into the tree, disrupting its ability to transport water and nutrients. This leads to dieback, canopy thinning, bark splitting, and ultimately, tree death within a few years if left untreated.

Why is EAB a Problem in Denver?

The Denver metro area has a significant population of ash trees, both on private properties and in public spaces. With no natural predators to keep EAB in check, the infestation has spread quickly. The combination of Colorado’s dry climate and the pest’s aggressive nature makes it difficult for infected trees to recover without professional intervention.

How to Identify an EAB Infestation

Recognizing the signs of an emerald ash borer infestation early can mean the difference between saving a tree and having to remove it.

Common Symptoms of EAB Infestation

• ✅ Canopy Dieback – Thinning and dead branches in the upper tree canopy.
• ✅ D-Shaped Exit Holes – Small, distinct holes where adult beetles emerge.
• ✅ Bark Splitting – Cracks in the bark with visible “S”-shaped larval tunnels underneath.
• ✅ Woodpecker Damage – Increased woodpecker activity as they feed on larvae.
• ✅ Epicormic Shoots – Unusual sprouting at the base of the tree or along the trunk.

If you notice any of these symptoms, your ash tree could be at risk. It’s essential to act before it’s too late.

Treatment Options for Emerald Ash Borer

The good news? EAB infestations are treatable—but early intervention is key. Keep It Green Tree Care offers professional treatments to protect your ash trees in the Denver metro area.

🌱 Systemic Insecticide Injections

• The most effective way to prevent and treat EAB infestations.
• Injected directly into the tree’s vascular system, minimizing environmental impact.
• Provides protection for up to two years with a single application.

🌳 Tree Health & Nutrient Support

• Strengthening your tree’s health can help it resist pests and recover faster.
• Deep root fertilization and soil amendments improve resilience.

🪓 Ash Tree Removal & Replacement

• If a tree is severely infested, safe removal may be the best option.
• We can recommend and plant EAB-resistant species to maintain your landscape’s beauty.

When Should You Treat for EAB?

The best time to treat for emerald ash borer is in the spring or early summer when trees are actively absorbing nutrients. However, if you suspect an infestation, don’t wait—immediate action can prevent further damage.

Why Choose Keep It Green Tree Care?

At Keep It Green Tree Care, we specialize in protecting and maintaining trees in the Denver metro area. Our certified arborists use industry-leading techniques to prevent, diagnose, and treat EAB infestations.

✅ Locally Owned & Operated – We understand the unique challenges of Colorado’s climate.
✅ ISA-Certified Arborists – Our team is trained to handle EAB infestations efficiently.
✅ Eco-Friendly & Effective Treatments – We use safe, targeted solutions to preserve your trees.
✅ Full-Service Tree Care – From EAB treatments to removals and replacements, we handle it all.

Schedule an EAB Inspection Today!

If you have ash trees on your property, don’t wait for the emerald ash borer to take its toll. Contact Keep It Green Tree Care for a free consultation and inspection. Our team will assess your trees and recommend the best course of action to keep your landscape healthy and pest-free. 

Protect your ash trees now—before it’s too late!