Ogunquit · York County

Hemlock Woolly Adelgid Treatment in Ogunquit, ME

Keep the hemlocks on your Ogunquit property healthy. Hemlock woolly adelgid is established in Ogunquit, and Tree Medics treats it across York County and Southern Maine.

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Inspecting a hemlock branch for woolly adelgid
CountyYork County
HWA in OgunquitEstablished
Check twigsTwice a year
One treatment can last4+ years

Hemlock woolly adelgid is a tiny, aphid-like insect from Asia that feeds on the sap of eastern hemlocks. Over several years, a heavy infestation can starve a hemlock of the stored energy it needs to grow, and the tree slowly declines. York County is entirely within Maine’s hemlock woolly adelgid quarantine.[1]

Hemlock woolly adelgid in Ogunquit

As of December 2024, the Maine Forest Service lists hemlock woolly adelgid as established in Ogunquit, and says it is widespread along the southern coast.[2]

Treatment options for hemlocks

Long-lastingImidaclopridFor hemlocks under three feet in diameter, one soil application can keep adelgid below damaging levels for more than four years.[3] It moves slowly, taking a year or more to reach the top of a large tree.[4]
Fast-actingDinotefuranMoves through the tree faster, which makes it useful for heavily infested hemlocks, but protects for only one to two years.[4]
Small treesOil and soapHorticultural oil and insecticidal soap can work on small trees, but need thorough coverage once or twice a year.[3]

How we treat hemlocks in Ogunquit

Step 1InspectWe check the underside of branches for adelgid and judge how much healthy foliage the tree still has.
Step 2Choose the right treatmentHeavily infested trees may need fast-acting treatment first, while healthier trees can get long-lasting protection.
Step 3MonitorWe keep an eye on treated hemlocks so they can be retreated when needed.
Hemlocks respond best when treated early.

Systemic treatments rely on the tree to move them up into its branches. A hemlock with plenty of healthy foliage takes up treatment far better than one that is already in steep decline. Untreated infested hemlocks are likely to die within four to ten years.[4]

Why hemlocks matter

Eastern hemlocks are long-lived, shade-tolerant evergreens that provide year-round screening, shade streams and hold soil on slopes. Losing a mature hemlock changes a property, and replacing one takes decades.

Want the full picture? Read our complete guide to hemlock woolly adelgid treatment in Southern Maine.

Hemlocks and woods in Ogunquit

Local landscapeOgunquit’s Marginal Way is a roughly 1.25-mile shoreline footpath; developer Josiah Chase donated the path and the land between it and the ocean to the Ogunquit Village Corporation for public use in 1925.[5]
Local landscapeThe 35-acre Payeur Preserve and Kirkpatrick Woods off Berwick Road in Ogunquit includes stone-walled cattle paths, vernal pools and an open wetland meadow at the headwaters of Leavitt Stream in the Ogunquit River watershed.[6]

Hemlock Woolly Adelgid help near Ogunquit

Tree Medics is based in Biddeford and works throughout Southern Maine. We also offer hemlock woolly adelgid services in nearby towns:

Wells, MEYork, MEKennebunk, ME

See all tree care in Ogunquit.

Sources

  1. Maine DACF: Hemlock woolly adelgid quarantine counties and towns
  2. Maine Forest Service: Hemlock woolly adelgid overview and distribution
  3. Maine Forest Service: Hemlock woolly adelgid fact sheet
  4. Michigan Invasive Species Program: Plan to treat trees for hemlock woolly adelgid (2026)
  5. Maine Historic Preservation Commission: Marginal Way (2024)
  6. Great Works Regional Land Trust: Payeur Preserve & Kirkpatrick Woods (2026)
FAQ

Hemlock Woolly Adelgid in Ogunquit: common questions

Is hemlock woolly adelgid in Ogunquit?

Yes. As of December 2024, the Maine Forest Service lists hemlock woolly adelgid as established in Ogunquit.

Is Ogunquit in Maine’s hemlock woolly adelgid quarantine?

Yes. All of York County is within Maine’s hemlock woolly adelgid quarantine, which restricts moving hemlock material.

What does hemlock woolly adelgid look like?

Look for small white, cottony masses on the underside of young hemlock twigs at the base of the needles. Check twice a year, at the start and end of Daylight Saving Time.

How long does treatment take to work?

Imidacloprid moves slowly and can take a year or more to reach the top of a large tree. Dinotefuran moves faster and is often used on heavily infested trees.

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Worried about a tree?

Many tree health problems can be managed when they are caught early. Reach out today for a professional evaluation.

(207) 303-7291 SaveMyTrees@TreeMedics.com

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