The majestic ash tree has long been a beloved part of our landscapes, but it’s under serious threat. The culprit? A metallic green insect no bigger than a penny—the Emerald Ash Borer (EAB). Since its accidental introduction into the United States, the EAB has devastated millions of ash trees across the country. If you’re a homeowner or property manager with ash trees, understanding emerald ash borer treatment options is essential to protect your investment and preserve the beauty of your landscape.

In this blog, we’ll discuss what the emerald ash borer is, signs of infestation, and most importantly, how to treat for ash borer to save your trees before it’s too late.

What is the Emerald Ash Borer?

The Emerald Ash Borer (Agrilus planipennis) is an invasive beetle native to Asia. It was first discovered in the United States in 2002 and has since spread across more than 30 states, leaving a trail of dead ash trees in its wake.

The beetle targets all species of ash, including green, white, and black ash. Females lay eggs on the bark, and when the larvae hatch, they burrow beneath the bark and feed on the tree’s vital tissues. This disrupts the tree’s ability to transport water and nutrients, eventually killing it.

How to Spot an Emerald Ash Borer Infestation

Before we talk about ash borer beetle treatment, it’s essential to recognize the signs of an infestation:

Thinning Canopy: Leaves become sparse, and branches may die from the top down.
D-shaped Exit Holes: Small holes in the bark, about 1/8 inch wide, are a clear sign of adult beetles emerging.
Bark Splits: Larvae feeding beneath the bark can cause vertical splits.
Epicormic Shoots: New shoots may sprout from the tree’s base as a stress response.
Woodpecker Activity: Increased woodpecker presence may indicate they’re feeding on EAB larvae.

Once these signs are visible, swift action is crucial. Without intervention, infested trees typically die within 2–4 years.

How to Treat for Ash Borer: Your Best Options

Treatment is possible, especially if caught early. Here are the most effective emerald ash borer treatment strategies available:

1. Insecticide Injections

Injecting systemic insecticides directly into the tree is one of the most effective treatments.

Best For: Trees that are still relatively healthy or have less than 30% canopy loss.
Common Chemicals: Emamectin benzoate and imidacloprid.
Application Frequency: Every 1–3 years depending on the product used.

These injections deliver the treatment directly to where the larvae feed, minimizing environmental impact.

2. Soil Drenching

Soil-applied treatments involve drenching the area around the base of the tree with insecticide.

Best For: Smaller trees with limited infestation.
Application Tips: Ensure the soil is moist, and avoid using near water sources.

This method can be less effective than injections but is a viable option for DIY homeowners.

3. Basal Trunk Sprays

Spraying insecticide onto the trunk allows the tree to absorb the chemical systemically.

Best For: Trees with early signs of infestation.
Limitations: Must be applied during the beetle’s active period, typically spring to early summer.

4. Tree Removal (As a Last Resort)

If a tree is heavily infested or already dead, removal may be the only option to prevent the spread to nearby ash trees.

Consider hiring a professional tree trimming service in Spring Hill, FL, or a tree service in Palm Harbor, FL, to assess and safely remove compromised trees.

When Should You Start Treatment?

Timing is everything. For best results:

Treat trees before they show severe symptoms.
Begin treatment in early spring when beetles are emerging.
Maintain a routine treatment schedule every 1–3 years depending on the method.

Waiting until you see damage might be too late to save the tree.

Can You Save an Infected Tree?

Yes—ash borer beetle treatment can be effective if applied early. Research shows that trees with less than 30% canopy loss respond well to treatment and can recover. Consistency is key: skipping a year can undo progress and allow the infestation to worsen.

If you’re unsure whether your tree is salvageable, consult a local arborist or a certified tree care professional.

Preventative Measures to Protect Ash Trees

Preventing infestation is easier and less expensive than trying to reverse it. Here are some key prevention tips:

Avoid moving firewood: EAB can hitch a ride on transported firewood.
Regular Inspections: Have your ash trees inspected annually.
Proactive Treatments: Start treatments even if the tree appears healthy.
Keep Trees Healthy: Water during dry periods, mulch properly, and avoid mechanical damage to the bark.

Using a professional tree trimming service in Spring Hill, FL can help maintain tree health, which improves resistance to pests and diseases.

Why Professional Help Matters

Treating for emerald ash borer isn’t a one-size-fits-all job. Hiring a licensed professional ensures:

Accurate diagnosis of the infestation
Safe and effective chemical application
Compliance with local environmental regulations
Long-term care strategies to keep trees healthy

If you’re in the Tampa Bay area, contact your local tree service in Palm Harbor, FL to assess your ash trees and recommend the best course of action.

The emerald ash borer is a formidable pest, but it doesn’t have to mean the end of your ash trees. You can protect and preserve your landscape for years with early detection, proper care, and the right emerald ash borer treatment.

Whether you’re trying to figure out how to get rid of emerald ash borer, or you’re simply looking for guidance on how to treat for ash borer, remember that the right combination of vigilance and professional support is your best defence.

If you notice signs of EAB or want to start preventative treatments, don’t wait—contact your local arborist today and give your ash trees a fighting chance.

Emerald Ash Borer Solutions: Treatments That Can Save Your Ash Trees