Aug. 9, 2022
Contact: Rob Miller (MDARD), 517-614-0454 or Joanne Foreman (DNR), 517-284-5814
August is a great time to enjoy the outdoors, and it’s also the best time to spot the invasive Asian longhorned beetle as adults emerge from trees. That’s why the U.S. Department of Agriculture is declaring August as “Tree Check Month.” Checking trees for the beetle and the damage it causes is one way you can protect trees and help the USDA’s efforts to eliminate this beetle from the United States.
 The Michigan departments of Agriculture and Rural Development; Environment, Great Lakes, and Energy; and Natural Resources are joining the USDA in asking people to take just 10 minutes this month to check trees around homes for the beetle or any signs of damage.
The Asian longhorned beetle, or ALB for short, is a non-native wood-boring beetle considered invasive in North America because it attacks 12 types of hardwood trees, including maples, elms, horse chestnuts, birches and willows. Here, there are no predators or diseases to keep ALB populations in check. In its larval stage, the insect feeds inside tree trunks and branches during the colder months. The beetle creates tunnels as it feeds, and then it chews its way out as an adult in the warmer months. |
Infested trees do not recover and eventually die. They also can become safety hazards since branches can drop and trees can fall, especially during storms.
You can help
 Although this invasive beetle has not yet been discovered in Michigan, it is crucial we keep an eye out for it. Discovering early signs of infestation can prevent widespread damage to the state’s forest resources, urban landscapes and maple syrup production.
“We’re asking for the public’s help to find Asian longhorned beetle and any tree damage it causes, because the sooner we know where the insect is, the sooner we can stop its spread,” said Josie Ryan, the USDA Animal and Plant Health Inspection Service’s national operations manager for the ALB Eradication Program. “Five of the 15 known infestation sites in the U.S. were detected and reported by alert residents, including the most recent discovery in Hollywood, South Carolina. This shows how critical public participation can be.”
The USDA recently reported the infestations at 10 of those locations have been eradicated. |
Look for signs
Whenever you are outdoors, take time to look at the trees around you for signs of the Asian longhorned beetle, including:
- 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 an egg site.
- Material that looks like wood shavings lying on the ground around the tree or in the branches.
- Dead branches or limbs falling from an otherwise healthy-looking tree.
Look for the beetle
 Adult Asian longhorned beetles are distinctively large, ranging from 3/4 to 1 1/2 inches in length, not including their long antennae. The beetles are shiny black, with random white blotches or spots, and their antennae have alternating black and white segments. They have six legs that can be black or partly blue, with blue coloration sometimes extending to their feet. |
Be aware of look-alikes
Several beetles and bugs native to Michigan often are mistaken for the Asian longhorned beetle, but there are differences to be aware of:
- The white-spotted pine sawyer has a distinctive white spot below the base of its head – between its wings – and is brownish in color.
- The cottonwood borer is about the same size as the Asian longhorned beetle and is also black and white, but it has a pattern of single, broad black stripes down each wing, and its antennae are all dark.
- The northeastern pine sawyer reaches up to 2 inches in length, has very long antennae and is gray in color.
- The eastern eyed click beetle has distinctive eye circles on the back of its head. It rolls over when threatened, then clicks and makes a flipping movement to get back on its feet.
Anyone observing an Asian longhorned beetle, or a tree appearing damaged by it, is asked to report it. If possible, capture the beetle in a jar, take photos, record the location and report it as soon as possible at AsianLonghornedBeetle.com or contact MDARD at 800-292-3939 or [email protected].
More information can be found at Michigan.gov/ALB.
Michigan’s Invasive Species Program is cooperatively implemented by the Department of Environment, Great Lakes, and Energy, the Department of Natural Resources, and the Department of Agriculture and Rural Development.
/Note to editors: The accompanying photos are available for download. Caption information follows.
Adults: Adult Asian longhorned beetles emerge from within trees in late summer to mate. Females chew small depressions in tree trunks or branches, such as those seen here, to deposit eggs. Photo courtesy of Kenneth R. Law, USDA APHIS PPQ, Bugwood.org.
Frass: Material resembling wood shavings at the base of a tree or tree branches is a sign of Asian longhorned beetle infestation. Photo courtesy of Kenneth R. Law, USDA APHIS PPQ, Bugwood.org.
Identification: The Asian longhorned beetle is a large, shiny black beetle with irregular white spots and black and white banded antennae. Photo courtesy of USDA APHIS PPQ.
WSPS: The white-spotted pine sawyer is native to Michigan and often mistaken for the Asian longhorned beetle. Look for a white spot between the upper wings to identify this pine sawyer. Photo courtesy of William M. Ciesla, Forest Health Management International, Bugwood.org.
Cottonwood: The cottonwood borer’s antennae are all black. Photo courtesy of Gerald J. Lenhard, Louisana State University, Bugwood.org.
NEPS: The northeastern pine sawyer is a large beetle reaching 2 inches in length. Its body is primarily gray with white and black spots. Photo courtesy of Jim Brighton.
Eyed beetle: The eastern eyed click beetle is distinguished by large circles on the back of its head. Photo courtesy of iNaturalist./ |
“Although not unexpected, this is certainly tough news to share due to its potential to for it to negatively impact Michigan’s grape industry,” said McDowell. “Spotted lanternfly has been moving closer to the state over the last few years. MDARD, along with our state, local and federal partners, has been working tirelessly to inform and educate growers and the public about this highly invasive insect.”
“MDARD and MDNR are working with the United States Department of Agriculture to define the extent of the infestation,” said Mike Philip, MDARD’s Pesticide and Plant Pest Management Division Director. “Although we can’t pinpoint exactly how it got here, it likely hitchhiked on nursery stock brought in from an infested state and has possibly been here for several months. We are in the assessment stage of response, but it is important to note that typical pest management techniques have not proven effective for eliminating the pest in other states.”
Spotted lanternfly moves easily on firewood, tires, campers, vehicles and more. Prevention and early detection are vital to limiting the spread of spotted lanternfly. If you find a spotted lanternfly egg mass, nymph or adult, take one or more photos, make note of the date, time and location of the sighting, and report it online to Eyes in the Field. Photos are necessary to verify a report and to aid in identification.
Several state parks in southern Michigan will host volunteer stewardship workdays in August. Volunteers are needed to help with removing invasive plants that threaten high-quality ecosystems.
It’s time to talk about your state forests.
Staff recommendations on whether to keep, exchange or sell land in the fifth set of 10 counties in the DNR’s state land review process are nearing DNR director approval, but there’s still plenty of time to review and share feedback via the 
Help improve wildlife habitat and hunting access at state game and wildlife areas with 
Want to see more pictures like this, taken by Michigan state parks photo ambassador 
Taking place twice a year, 
The next meeting of the Michigan Natural Resources Commission leads off with a Wildlife Committee agenda that includes an overview of turkey hunting regulations and a presentation about the antler point restrictions and chronic wasting disease study.
Winnie the Pooh, Yogi, Baloo and the Berenstain family are among the most popular bears in books or on TV. But in the natural resources world, the crown goes to none other than Smokey Bear.
Eastern monarch butterflies are one of the most well-known butterflies in North America. These gorgeous orange, black and white butterflies are a staple of Michigan summers, and they need our help.
Want to see more pictures like this, taken by Michigan state parks photo ambassador 
Fall is one of the best times to get involved in the DNR Wildlife Division – and one of the busiest.
Every two years, the 
If you enjoy riding off-road vehicles on Michigan’s forest roads, you can help the DNR shape the 2023 forest road maps. Submit comments by Aug. 31.