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Destructive pests: Check your trees for Asian long-horned beetles

September 15, 2017
the Asian long-horned beetle

Asian long-horned beetle (Photo credit: Joe Bogs, Ohio State University)

August is peak emergence season for the invasive Asian long-horned beetle, a pest that poses a serious threat to shade trees. A Purdue University entomologist is urging people to perform their annual tree checkup for these destructive insects. In just a few minutes, people can determine if their trees are infested and save countless other trees through early detection.

This month is designated “Tree Check Month” by the U.S. Department of Agriculture’s Animal and Plant Health Inspection Service, or APHIS. The Asian long-horned beetle has not been found in Indiana yet, but it has been found nearby in Chicago and Ohio.

“If you see an Asian long-horned beetle, you should report it,” said Cliff Sadof, a Purdue professor of entomology. “Early reports by private citizens have been critical to eradication efforts in Chicago, Ohio, New York and New Jersey.”

To report the beetle, Sadof recommends calling 1-866-NO-EXOTIC. Smartphone apps also are available at, where citizens can report suspected beetle infestations. Reports go to the state first and then to Purdue for confirmation.

The Tree Doctor App, which is available at Purdue Extension’s The Education Store at, can also be used to identify this beetle and other common tree pests.

The Asian long-horned beetle is a distinctive-looking insect with these characteristics:

Signs of an infestation start to show about three to four years after the tree is infested. Such trees show these signs:

Asian long-horned beetles also commonly fall into swimming pools. Sadof suggests residents check their water skimmers for the beetle, too.

APHIS reports that maples are the most commonly infested trees in North America. Infested trees do not recover and, therefore, should be removed.

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