- Asian Longhorned Beetle (no confirmed sightings in Maine as yet)
- Brown Marmorated Stink Bug — Halyomorpha halys (Stal) (Northeastern IPM Center)
- Browntail Moth
- Emerald Ash Borer (found in Maine on 5/22/18 in Madawaska and it has now been confirmed in three southern Maine towns as well)
- European Crane Fly (Tipula paludosa) (pest of lawns and turf) (Cornell)
- European Red Ant (Myrmica rubra) – The European Red Ant is also called the European Fire Ant; It is an invasive insect in Maine, increasing in both its geographical range (particularly in coastal communities) and in its encounters with homeowners. However, these ants are only distantly related to the ‘true’ fire ants found in the southern U.S. and Latin America.
- Hemlock Woolly Adelgid
- Spotted Lanternfly (Not found in Maine as yet; Reported in these states thus far: PA, DE, NY, VA, NJ, CT and MD); This pest is not a fly or a moth, but rather a type of Hemipteran commonly called a planthopper.
- Spotted Wing Drosophila (invasive) (a unique fruit fly native to Asia which has spread from west to east across North America all the way to Maine) (see Fruit Flies)
- Winter Moth (Maine Forest Service) [see also Control of Winter Moth Damage in New England Blueberries (PDF) — UMass] [2012 Bangor Daily winter moth story] and the Maine Forest Service Press Release (Nov-Dec 2015) “When moths fly with snow, let the Maine Forest Service know!”
- Invasive Species (Maine.gov)
- Maine Department of ACF’s Invasive Plant Rules (in effect as of 1/25/2017)
- Terrestrial (Land-dwelling) Invasive Species (eXtension.org)
- Invasive Plants: UMaine Extension Fact Sheet Series
- Maine Forest Service: Invasive Threats to Maine’s Forests and Trees
- USDA – APHIS: Leave Hungry Pests Behind