MDARD implements new quarantine for mountain pine beetle

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For immediate release: September 29, 2020
Program contact: Mike Bryan, 517-449-9435
Media contact: Jennifer Holton, 517-284-5724

MDARD implements new quarantine for mountain pine beetle

Department working to protect Michigan’s pine trees from devastating pest

LANSING–Michigan Department of Agriculture and Rural Development (MDARD) Director Gary McDowell is taking steps to protect the state’s pine trees from a potentially devastating exotic pest–the mountain pine beetle. Mountain pine beetle is one of the most destructive forest pests in North America, known for outbreaks that have killed millions of pine trees in the western United States and Canada.

“Mountain Pine Beetle hasn’t been detected in Michigan yet, but we’re taking the necessary, proactive steps to ensure our pine resources are here for generations to come,” said McDowell. “Many of us remember the havoc wreaked by emerald ash borer. This new quarantine and restrictions are working to ensure similar devastation following the introduction of a non-native pest doesn’t happen again.”

The state’s new Mountain Pine Beetle Exterior State Quarantine regulates the movement of pine forest products with bark including logs, stumps, branches, lumber and firewood originating from a number of impacted states including Arizona, California, Colorado, Idaho, Missouri, Montana, Nevada, New Mexico, Oregon, South Dakota, Utah, Washington, Wisconsin, Wyoming, and the Canadian provinces of Alberta, British Columbia and Saskatchewan.

Mountain pine beetles affect pine trees by laying eggs under the bark and introducing a blue stain fungus. The joint action of larval feeding and fungal colonization kills the host tree within a few weeks of successful attack. As beetle populations increase, or as more trees become stressed because of drought or other causes, the beetle population may quickly increase and spread.

Mountain pine beetle has expanded its range, moving northward and eastward. The expansion is attributed to warmer winters, which allow more beetles to survive. Michigan’s pine resources are at risk of attack by MPB, including white pine, jack pine, red pine, Austrian pine, and Scots pine.

“Michiganders traveling out West should not transport firewood or untreated pine from states with known infestations,” added McDowell.

Additional information about MPB is available at The MPB Exterior State Quarantine is available on the department’s website, and suspected quarantine violations can be reported by emailing