Michigan has eight insects on its list of invasive species.
If you see these insects, you should report them to the state and catch and kill them.
Many of these insects threaten trees and plants across the state, some can have devastating effects if left unchecked.
If you believe you have found any of these invasive insects, please report it through the Midwest Invasive Species Information Network. Only click here and find the insect.
Spotted Lantern Fly
If you see one, catch it and kill it.
Each spotted lanternfly can lay an egg mass containing about 30-50 eggs. If you see an egg mass, squeeze it.
These insects feed on more than 70 different plants, including grapes, apples, hops and hardwood trees. It sucks sap from host plants and secretes large amounts of a sugary, sticky liquid called honeydew.
The honeydew and resulting black sooty mold can kill plants and dirty surfaces. The honeydew attracts pests such as yellow jackets, flies and ants.
There are people online who use water bottles or other plastic cups to catch the spotted lanternfly when they are in trees. You simply put the mouth of the bottle around it and the lanternfly flies into the bottle.
A small population of them was identified in Michigan earlier this month. If you find a spotted lanternfly, please report it to MDARD via email at MDA-Info@Michigan.gov or by calling 800-292-3939. If possible, collect a sample in a container to verify it.
Read: Invasive Spotted Lantern Fly Found in Michigan for the First Time: What to Know
The Japanese Beetle is widespread throughout Michigan.
Adult beetles are about 3/8 inch long and have a bright, metallic green head and body and metallic brown wings. Its legs are darker green. There are twelve tufts of white hairs around the edges of the abdomen.
Larvae or grubs are about 1/16 to 1/4 inch long, white, and have three pairs of legs. Adult beetles appear in June or July and feed all summer.
The larvae live underground and feed on grass roots. They leave brown spots in lawns. The adults feed on foliage, flowers, and fruits, including tree fruits, soft fruits, ornamentals, garden vegetables, soybeans, and corn.
Read: 6 Invasive Insects To Watch Out For In Michigan
spongy moth caterpillars hatch from brown, fuzzy egg masses in April and feed on leaves until late June.
The caterpillars are hairy and have a yellow and black head, five pairs of blue spots followed by six pairs of red spots. Adult caterpillars are 1.5 to 2 inches long.
If you find leaf litter and small, round frass under trees, that’s an indication of a spongy moth infestation.
The wings of male moths have a wavy pattern from brown to dark brown and span 1.5 inches. Female moths are larger than males and do not fly. The females have white to cream colored wings with wavy black markings.
The caterpillars are of concern because they can defoliate trees, making them vulnerable to disease and other pests that can kill trees. Caterpillars can be blown to other trees by the wind.
Read: Invasive moth found in Michigan gets new name for derogatory term
Emerald green ash borer
The emerald green ash borer is known on the lower peninsula of Michigan.
They have a bright, metallic green body with purple abdominal segments under the wing covers. It is about 1/2 inch long as an adult. It fits on the head of a penny. The larvae are worm-like. They create a d-shaped exit hole in trees.
Adults feed on ash foliage while the larvae tunnel and feed at the bottom of the park, cutting off the transport of nutrients and water to the tree.
They were first discovered in Michigan in 2002 and have killed tens of millions of ash trees in Michigan. It has killed trees in forests and neighborhoods.
Adults usually only fly 1/2 mile, but they can be transported to unaffected areas by contaminated firewood.
Read: 11 Invasive Species to Watch Out for in Michigan
Brown marbled stink bug
The brown marbled stink bug is located in Michigan.
It is a 0.5-0.625 inch shield-shaped insect that uses its piercing mouthparts to suck plant juices from fruits, seed pods and nuts on many plants.
It was accidentally brought to North America from Asia in 1996. It was first discovered in Michigan in 2010 and is now a major pest for farmers.
Stink bugs have since been found in all counties of Michigan, but are well established in the southern part of the Lower Peninsula.
The good news is that stink bugs do not cause structural damage or reproduce in homes. They also do not bite people or pets.
They aren’t known to transmit disease or cause physical harm, but they don’t get their name for nothing — they produce a pungent chemical that — well, it stinks.
Read more: Let’s Talk Michigan Stink Bugs: Why Are They Here? What should you do about it?
Asian longhorn beetle
It is an invasive wood-boring beetle that attacks 12 species of hardwood trees, including maples, elms, horse chestnuts, birches, and willows. It has no predators or diseases to keep the population down.
When in the larval stage, it feeds on trunks and branches during the colder months. It creates tunnels as it feeds and then chews its way out as an adult in the warmer months.
Trees that have been invested will not survive.
Look out for the following signs when you’re outside:
Round exit holes, about the diameter of a pencil, found in tree trunks and branches.
Shallow oval or round scars in the bark, where the adult beetle chewed on an egg site.
Material that looks like wood shavings on the ground around the tree or in the branches.
Dead branches or limbs fall from an otherwise healthy-looking tree.
Adult Asian longhorn beetles are large, ranging from 3/4 to 1 1/2 inches in length. That does not apply to their long antennae. They are glossy black and have random white spots or blotches.
Read more: Start checking trees for signs of Asian longhorn beetles: what they are, why they pose a threat
Balm woolly adelgid
Balm woolly adelgid was discovered in Michigan.
It infests true spruce, including balsam, fraser and concolor (white) spruce in Michigan forests and landscapes.
It is a sap-feeding insect and its repeated attacks can weaken trees, cause twig gout and cause trees to die over the course of several years.
Michigan officials say to watch for the following signs:
Small white woolly tufts of one to two millimeters on the lower trunk of the tree and possibly on large branches in spring and summer.
Swelling and deformation of the twigs, commonly referred to as “gout”.
Marking – a branch or branches that turn brick red.
Tree crowns that become narrow and misshapen with few needles.
Read: Bug That Could Harm the Christmas Tree Industry Found in West Michigan
Hemlock woolly adelgid
Hemlock woolly adelgid was discovered in Michigan.
It infests eastern hemlocks and is found in Michigan in woodland and landscape settings. Eastern hemlock spruce occurs naturally in moist forest environments and along streams and water bodies.
The hemlock woolly adelgid sucks sap from the hemlock needles and kills needles, shoots and branches. Affected hemlocks become less vigorous and may turn gray-green. If left untreated, it can kill a tree in four to 10 years.
Michigan says to watch out for the following signs:
Small, round, white, fluffy masses, 1/16″ to 1/4″.
Found on the twig at the base of the needles on the underside of hemlock tree branches.
Present all year round, but most visible from November to July.
Note that hemlock woolly adelgid infests eastern hemlock spruces, not pines or spruces.
Read: Time to check Christmas trees for woolly adelgid
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