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Invasive Species: Insects
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.
Box Tree Moth
Box tree moth caterpillars feed primarily on boxwood and can defoliate host plants. Once the leaves are gone, larvae consume the bark, leading to girdling and plant death.
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.
Hemlock Woolly Adelgid
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.
Mountain Pine Beetle
(Dendroctonus ponderosae Hopkins)
Mountain pine beetle is an aggressive and destructive bark beetle that can infest most pine tree species. The beetles and their larvae tunnel through inner bark, eventually causing tree death.
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.