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Invasive Forest Pests Information


The Maine Forest Service has a wealth of information on Invasive Forest Pests and Diseases on their website, Invasive Threats to Maine's Forests and Trees: Forest Health & Monitoring: Maine Forest Service: Maine ACF 

Landowner Information 

Maine Soil and Water Conservation Districts have received funding through the Maine Department of Agriculture, Conservation, & Forestry (DACF) to provide outreach on Invasive Threats to Maine's Forests through workshops and at state-wide events and fairs. The grant project extends through mid-September, 2023 so look for Districts at IFP booths at events all around the state.

Currently, invasive pests that occur in Maine include:

  • emerald ash borer, initially found in the towns of Frenchville, Grand Isle, Madawaska in Aroostook, and Acton and Lebanon in York County and since expanded to other areas in southern Maine
  • hemlock woolly adelgid & elongate hemlock scale, recently found near Waldo County
  • winter moth
  • gypsy moth
  • browntail moth (Browntail moth caterpillars defoliate trees; contact with toxic hairs can cause severe dermatitis and respiratory problems.)

Those that do not YET occur in Maine, but are close by other states:all in one Oct2018 for web

  • Asian longhorned beetle
  • Spotted Lanternfly
  • Oak Wilt Disease

Because of the discovery of the emerald ash borer (EAB) in northern Aroostook County, providing education to landowners has become even more important. EAB is a non-native beetle that infects and kills ash trees. While EAB is expected to eventually become established throughout the state, most ash in Maine are years away from being infested. Now is the time to plan for EAB's arrival and determine potential impacts. Management should focus on creating a more diverse forest in both structure and species composition, not eliminating ash. The Maine Forest Service has provided some great information for landowners on anticipating and managing for EAB. Check out the following pdf's:

EAB Information for Maine landowners

Guidance for Maine Forest Managers

How do invasive pests get here?

Invasive forest pests typically get moved around unintentionally. They get moved long distances:

  • in wooden packing material (pallets and crates);
  • on infested plants in the nursery trade;
  • in soil of plants that people bring to summer homes or when they move;
  • and through the movement of FIREWOOD.

Maine currently bans out of state firewood from crossing state lines, but pests can easily be transported from one part of the state to another. Check out to locate local sources of firewood or simply remember this:

Buy it where you burn it!

FirewoodScout for web