Species that are not native and also have the potential to harm human health or to harm natural, agricultural or silvicultural resources can be listed as prohibited or restricted by the State of Michigan. If a species is prohibited or restricted, it is unlawful to possess, introduce, import, sell or offer that species for sale as a live organism, except under certain circumstances.
- Asian Longhorned Beetle
Watch List - Prohibited in Michigan
The Asian longhorned beetle can attack and kill many tree species including poplar, willow, sycamore, and horse chestnut, but its favorite host are maple trees. The larvae feed in tunnels in the wood of the tree branches and trunks, eventually killing the tree.
- Balsam Woolly Adelgid
Balsam woolly adelgid is a sap-feeding insect that attacks true fir trees, including balsam fir and Fraser fir. Repeated attacks weaken trees, cause twig gouting, kill branches and, over the course of several years, cause trees to die.
- Brown Marmorated Stink Bug
Brown marmorated stink bugs affect agricultural crops, fruit trees and ornamentals and can be a nuisance in indoor environments.
- Emerald Ash Borer
Prohibited in Michigan
The Emerald Ash Borer is a bright, metallic green insect with purple abdominal segments under its wing covers. They are approximately 1/2 inch in length and can fit on the head of a penny. The larva are worm-like. The adults feed on the foliage of ash tress and the larvae tunnel and feed on the underside of the bark.
- Gypsy Moth
Gypsy moth caterpillars defoliate trees, leaving trees vulnerable to diseases and other pests, which may lead to tree mortality.
- Hemlock Woolly Adelgid
*Detected in Michigan*
These tiny insects secrete white wax as they feed on sap from hemlock shoots and branches. Hemlock woolly adelgid (HWA) feeding can kill needles, shoots and branches, resulting in tree death.
- Japanese Beetle
Japanese beetle grubs damage lawns and turf grasses. Beetles skeletonize leaves and flowers of ornamental plants and trees and can damage crops.
- Spotted Lanternfly
The spotted lanternfly sucks sap from the stems and leaves of orchard trees, grape vines, oaks, pines and other host plants. Feeding can weaken the plant and eventually contribute to its death. Trees will develop weeping wounds that attract other insects and excreted fluids from spotted lanternflies can cause mold growth on plants.