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Hemlock Woolly Adelgid

On July 5, 2017, Michigan’s Hemlock Woolly Adelgid (HWA) Interior State Quarantine will go into effect. Established by the Michigan Department of Agriculture & Rural Development (MDARD) to prevent the further spread of HWA in Michigan, this quarantine regulates movement of Hemlock WITHIN Michigan. Whereas the pre-existing HWA Exterior Quarantine, already in place, will continue to regulate movement of hemlock from out-of-state sources.

This Interior Quarantine establishes a regulated area consisting of Allegan, Oceana, Ottawa and Muskegon Counties. Movement of hemlock (Tsuga spp.) and tiger-tail spruce (Picea torano) nursery stock (and any part of those species’ trees that presents the risk of spreading HWA) is prohibited from the regulated area into any other counties in MI, except under a compliance agreement. The quarantine also prohibits movement within the regulated area, except under a compliance agreement.

The HWA Nursery Program Facility Compliance Agreement was developed in conjunction with the industry and is issued by the MDARD. It specifies treatments and other phytosanitary measures to mitigate the risk of spread of HWA. This compliance agreement can be obtained by contacting your MDARD inspector.

Hemlock Woolly Adelgid Interior State Quarantine (PDF)

Notification Letter to Stakeholders and Industries Associated with Hemlock (PDF)

MDARD Hemlock Woolly Adelgid Nursery Program (PDF)

Hemlock Woolly Adelgid Nursery Program Compliance Agreement (PDF)

Hemlock Woolly Adelgid Infestation Map 2017 (PDF)

Hemlock Woolly Adelgid (PDF)

Hemlock Woolly Adelgid: A little insect that means big trouble for hemlock trees in Michigan (PDF)

Hemlock Woolly Adelgid Exterior Quarantine (PDF)

Counties Regulated under HWA Exterior Quarantine (PDF)

Pest Alert: Hemlock Woolly Adelgid (PDF)