• 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 longhorn beetle Asian Longhorned Beetle

    (Anoplophora glabripennis)

    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

    (Adelges piceae)

    Watch List

    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 Bug

    (Halyomorpha halys)

    Brown marmorated stink bugs affect agricultural crops, fruit trees and ornamentals and can be a nuisance in indoor environments.

  • Emerald Ash Borer Emerald Ash Borer

    (Agrilus planipennis)

    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 caterpillar Gypsy Moth

    (Lymantria dispar)

    Gypsy moth caterpillars defoliate trees, leaving trees vulnerable to diseases and other pests, which may lead to tree mortality.

  • Hemlock woolly adelgid Hemlock Woolly Adelgid

    (Adelges tsugae)

    Watch List

    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.

  • Japanese Beetle Japanese Beetle

    (Popilla japonica)

    Japanese beetle grubs damage lawns and turf grasses. Beetles skeletonize leaves and flowers of ornamental plants and trees and can damage crops.