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Scientific name: Hesperophanes (Trichoferus) campestris Faldermann
Native range: Asia and portions of eastern Europe
Past finds of Chinese longhorned beetle have not resulted in regulatory actions due to the isolated finds of small numbers of beetles. However, regulatory actions including restricting movement of host material, control actions or eradication measures could be taken in the future in response to an infestation. This insect should not be confused with the Asian longhorned beetle, which is a different pest of concern.
The Chinese longhorned beetle has been detected in Quebec, Canada, and in a number of states in the U.S. A single beetle was captured in Minnesota in 2010 as part of a USDA trap survey for invasive wood-boring insects. Follow up surveys did not find any local infestations and it has not been found since.
Larvae overwinter in wood and pupate in spring. Adults emerge from wood and are active from June to August. Adults mate and females lay eggs on the bark of trees. Larvae hatch from eggs and tunnel under the bark and eventually into the wood. A single generation takes at least one year and could take two to complete.
Identification of this species is difficult due to a multitude of related species that may be found in the same types of trees. Larval life stages will not be identifiable to species. Identification of adult beetles will require an entomologist to distinguish them from related species. The adult beetle is about ½- ¾ inches long.
Many species of longhorned beetles have a similar appearance.
Host Plants and Impact
Preferred hosts of the Chinese longhorned beetle are apple and mulberry. Other potential hosts in Minnesota include ash, birch, cedar, elm, fir, grape, larch, locust, maple, mountain ash, oak, pine, spruce and willow. This beetle is reported to infest healthy trees as well as stressed or dying trees as well as cut wood. Larval feeding under bark and in wood can stress or kill trees and reduces marketability of wood. Feeding damage can reduce yield of fruit trees.
The ultimate pest potential of this insect in North America is yet to be determined. Given that it has been detected numerous times without documentation of infested trees, it may be that the pest potential is low. However, contact the MDA via Arrest the Pest if you suspect the presence of Chinese longhorned beetle in Minnesota.
Chinese longhorned beetle information from USDA
Minnesota Department of Agriculture (MDA), 625 Robert Street N, St. Paul, MN 55155-2538, firstname.lastname@example.org