Emerald Ash Borer in New Hampshire: Should You Treat or Remove Your Ash Tree?

What Is the Emerald Ash Borer and Why Should Manchester Homeowners Care?

The emerald ash borer (EAB) is an invasive beetle native to Asia that has become one of the most destructive forest pests in North America. Since its discovery in Michigan in 2002, this tiny but devastating insect has spread across nearly every state, including New Hampshire. The emerald ash borer in New Hampshire represents a serious threat to the millions of ash trees that grow throughout the state and in residential areas like Manchester.

What makes the emerald ash borer so dangerous is its lifecycle and feeding habits. Adult beetles lay eggs on the bark of ash trees, and when the larvae hatch, they tunnel beneath the bark and feed on the tree's vascular tissue. This disrupts the tree's ability to transport water and nutrients, essentially starving it from the inside out. A healthy ash tree can be killed within three to five years of infestation, making early detection and action critical for homeowners who want to save their trees.

Signs Your Ash Tree Is Infested with Emerald Ash Borer

Recognizing the early symptoms of emerald ash borer damage can mean the difference between saving your tree and losing it. One of the most telling signs is the presence of D-shaped exit holes in the bark, roughly the size of a match head. These holes are created when adult beetles emerge from the tree in late spring and early summer. If you notice these distinctive exit holes on your ash trees, it's a clear indicator that infestation is underway.

Beyond exit holes, look for other warning signs including crown thinning (loss of branches and foliage from the top of the tree), bark splitting or peeling, and increased woodpecker activity. Woodpeckers are attracted to ash trees infested with EAB larvae and will peck away bark to feed on the insects, creating additional damage. You may also notice epicormic sprouting, which is the growth of new shoots along the trunk and branches. If you suspect your ash tree has emerald ash borer, don't wait to have it professionally assessed. Contact Manchester Tree Service for a free estimate or call us at (603) 634-9650 to schedule an inspection.

Emerald Ash Borer Treatment: Can Your Tree Be Saved?

If your ash tree is in the early stages of infestation, treatment may be a viable option to preserve the tree. Emerald ash borer treatment typically involves trunk injections of systemic insecticides that are absorbed by the tree and circulate through its vascular system. These treatments are most effective when applied to trees that show minimal signs of damage and have a relatively healthy crown. The most commonly used treatments include emamectin benzoate and dinotefuran, which are injected directly into the tree's trunk or root flare.

The timing and frequency of treatment are important factors in success. Most arborists recommend treating trees in the spring before adult beetles emerge, and treatments generally need to be repeated every one to two years to maintain protection. For trees that are already heavily infested or have lost more than 50 percent of their crown, treatment becomes less effective and may not be worth the investment. An experienced arborist can assess your specific tree and recommend whether treatment is a realistic option for your situation.

Ash Tree Injection Cost in Manchester: What to Budget

Understanding the financial commitment involved in treating an ash tree is essential for making an informed decision. The ash tree injection cost varies depending on several factors, including the tree's size, the number of injections needed, the type of insecticide used, and local market rates. In Manchester and surrounding areas, homeowners can typically expect to pay between $75 and $150 per injection for professional treatment. A single large ash tree may require multiple injections, bringing the total cost to anywhere from $300 to $1,000 or more per treatment cycle.

Because treatment needs to be repeated annually or biennially to remain effective, the long-term cost can accumulate significantly. Over a five-year period, treating a large ash tree could cost $1,500 to $5,000 or more. When comparing treatment costs to Tree Removal and Stump Grinding, many homeowners find that removal becomes the more economical choice, especially for trees that are already moderately to heavily damaged. For detailed pricing on treatment or removal options, reach out to Manchester Tree Service today.

Ash Tree Removal: When It's Time to Remove Instead of Treat

In many cases, removal is the most practical and cost-effective solution for ash trees infested with emerald ash borer. If your tree is already showing advanced signs of infestation, such as significant crown dieback, extensive bark damage, or structural instability, removal should be strongly considered. A heavily infested ash tree poses a safety risk to your home, family, and property, particularly during storms when weakened branches may fall unexpectedly.

Additionally, if you have multiple ash trees on your property and several are infested, removing them all at once may be more economical than attempting to treat each one individually. Professional Tree Removal services ensure that the tree is safely taken down and the stump is properly disposed of or ground down. Following removal, many homeowners choose to plant new, non-ash species that are better suited to the local climate and resistant to invasive pests. Manchester Tree Service can help you evaluate whether removal is the right choice for your ash trees and handle the entire process from start to finish.

Prevention and Next Steps for Manchester Homeowners

While the emerald ash borer in New Hampshire continues to spread, there are steps homeowners can take to protect their property and make informed decisions about their ash trees. First, have any ash trees on your property inspected by an experienced arborist to determine their current health status and infestation level. Early detection allows for more treatment options and better outcomes. Second, avoid moving firewood or ash logs between properties, as this can inadvertently spread the beetle to new areas.

If you're uncertain whether to treat or remove your ash trees, Manchester Tree Service is here to help. Our experienced team can assess your trees, explain your options, and provide honest recommendations based on your tree's condition and your budget. Whether you decide on treatment, removal, or a combination of both, we have the expertise and equipment to handle the job safely and efficiently. Call us today at (603) 634-9650 or contact us online for a free estimate. Don't let the emerald ash borer make the decision for you; take action now to protect your property and your trees.