Browntail Moth in Coastal Maine: What Homeowners Should Watch for This Fall

If you've lived in Kennebunkport, Kennebunk, or anywhere along the southern Maine coast for the past few years, you know the browntail moth by reputation — the itchy rash, the defoliated oaks, the warnings about hanging laundry outside in June. Here's the good news: Maine's browntail moth population has declined dramatically since the outbreak peaked in 2021. The cautious news: coastal Maine remains prime browntail habitat, and late summer through fall is exactly when the next generation settles in for winter — right where you can see it.

That makes right now, late August, the start of the most important browntail scouting window of the year for coastal Maine homeowners.

What Is the Browntail Moth, and Why Is It a Problem?

The browntail moth is an invasive insect whose caterpillars carry microscopic toxic hairs that cause a poison ivy–like rash and, in some people, respiratory irritation. The caterpillars also feed heavily on oak, apple, crabapple, cherry, beach plum, and rugosa rose — some of the most common trees and shrubs in coastal Maine landscapes.

Those host plants are worth reading twice. Beach plum and rugosa rose are staples of seaside plantings here in Kennebunkport, and mature oaks anchor many older properties in the village and along Ocean Avenue. Browntail moth isn't just a forest problem — it's a backyard problem, and coastal communities have historically carried the heaviest concentrations in the state.

Where Do Things Stand in 2026?

Browntail moth populations in Maine have fallen sharply over the past several years. According to the Maine Forest Service, defoliation peaked at more than 198,000 acres in 2021, then dropped to roughly 46,000 acres in 2023 and only about 2,000 acres in 2024 — thanks largely to naturally occurring fungal outbreaks that knocked populations back. State monitoring in spring 2026 confirmed populations have continued to decline.

So why still pay attention? Two reasons:

1. Browntail is a boom-and-bust insect. Maine has seen populations crash and rebound before. The moth never fully disappears from the coast — it persists in patches and rebuilds when weather conditions favor it.
2. Coastal pockets remain. Populations are still found in patches along the Maine coast. A single infested oak on your property — or your neighbor's — can produce enough caterpillars next spring to make a patio, play area, or garden unusable in June.

The homeowners who avoid problems next summer are the ones who scout this fall.

How Do I Spot Browntail Moth Winter Webs?

Browntail moth caterpillars hatch in late summer, feed briefly, and then build tight silken winter webs at the very tips of branches — usually on oak or fruit trees. Look for palm-sized clumps of leaves wrapped tightly in bright white silk, firmly attached at branch tips. They become much easier to see after leaf drop in October and November.

A few tips for scouting your Kennebunkport property:

• Check host trees first. Oaks, apples, crabapples, cherries, beach plum, and rugosa rose are the priority.
• Look at branch tips, not trunks. Winter webs sit at the outermost ends of branches, often in the upper canopy.
• Wait for leaf drop for a full survey. A quick binocular scan on a sunny November day is the single most effective browntail check you can do.
• Don't confuse them with fall webworm. Fall webworm nests (common right now, in late summer) are large, loose, messy webs enclosing whole branch sections — unsightly but mostly harmless. Browntail winter webs are small, tight, and bound with noticeably bright silk.

What Should I Do If I Find Webs?

Winter webs can be safely clipped and destroyed between October and mid-April, while the caterpillars are dormant inside and before toxic hairs become a widespread issue. Clip webs on small trees and shrubs with pole pruners, then soak them in soapy water or burn them where permitted. Webs high in mature trees should be handled by a licensed arborist or professional crew.

Timing matters here. By late April, caterpillars leave the webs and disperse — at that point, clipping accomplishes little, and by June the toxic-hair season is in full swing. Fall and winter removal is the low-risk, high-reward move.

If your property has a history of browntail activity, it's worth building web removal into your regular fall cleanup. Our crews are on coastal properties all season for fall lawn and property maintenance, and dormant-season pruning pairs naturally with winter services visits — we're already looking at your trees when the leaves are down.

Can Landscaping Choices Reduce Browntail Risk?

Yes — plant diversity is your best long-term defense. Properties dominated by oaks and unpruned fruit trees give browntail moth exactly what it needs. Mixing in non-host species like maple, birch, spruce, and salt-tolerant natives reduces the food supply and makes future infestations less likely to take hold.

If you're planning a planting project this fall — and fall is the best time to plant trees and shrubs in coastal Maine — it's worth having a landscape design conversation that accounts for pest pressure, not just aesthetics. Keeping fruit trees pruned and vigorous also helps, since stressed, neglected trees are more attractive targets.

Fold Browntail Scouting Into Your Fall Routine

The best part about browntail scouting is that it costs you nothing but attention, and it slots neatly into the fall work your property needs anyway. While you're walking the yard planning aeration, overseeding, and leaf cleanup, look up. For homeowners in our northern service area, our Scarborough lawn care team handles fall aeration and cleanups and can flag suspect webs while on site. Your late-summer and fall browntail checklist:

• Late August–September: Note any browning branch tips on oaks and fruit trees (early feeding damage)
• October–November: Do a full winter-web survey after leaf drop
• November–March: Clip and destroy reachable webs; schedule an arborist for high canopy webs
• Anytime: Diversify plantings away from heavy host-tree concentrations

Local Knowledge Matters

Browntail moth is a distinctly Maine problem, and managing it well takes local eyes and local timing. Wakem Lawn Care works on coastal properties from Kennebunkport throughout southern Maine every week of the season — we know what browntail webs look like, which neighborhoods have history with them, and how to fold removal into your regular fall and winter maintenance without drama.

If you'd like a fall property walkthrough — for browntail webs, fall lawn priorities, or winter prep — contact us and we'll take a look before the snow flies.