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Hemlock woolly adelgid regulations
Hemlock woolly adelgid (Adelges tsugae Annand) is a serious pest of Canadian hemlock (Tsuga canadensis) and eastern hemlock (T. caroliniana) in the northeastern United States. This aphid-like pest was first found in British Columbia in 1922 and Oregon in 1924. It can now be found from California to Alaska on western (T. heterophylla) and mountain hemlock (T. mertensiana), though these trees are relatively resistant to its attacks. Native to Asia, hemlock woolly adelgid (HWA) has caused significant mortality to native and ornamental hemlock trees throughout the northeast United States, including Pennsylvania, New Jersey, New York, and New Hampshire. They attack young branches and can cause rapid mortality, sometimes as short as one year.

Michigan, New Hampshire, Ohio, and Vermont strictly prohibit any importation of hemlock from Oregon. Hemlock exported from Oregon to Maine or Wisconsin is permitted provided the shipper meets certain requirements. Wisconsin requires certification by an ODA official regarding the treatment of plants, growing conditions and site of the plants, or freedom from HWA at the time of inspection. In Maine, hemlock from Oregon can be shipped ONLY to the quarantine counties of Androscoggin, Cumberland, Kennebec, Lincoln, Sagadahoc, and York.  Shipping to all other counties in Maine is prohibited. You can find more information regarding Wisconsin’s and other state’s HWA regulations at www.nationalplantboard.org.
On July 1, 2008 the Canadian Food Inspection Agency amended importation requirements to prevent the introduction of Adelges tsugae into Canada. Those shipping Tsuga spp, Picea jezoensis and Picea polita to all provinces of Canada, excluding British Columbia, will need to sign an agreement with the USDA approving the nursery to ship HWA host material to Canada. This agreement requires the following:
  1. Train your staff to visually identify Adelges tsugae.
  2. Put in place a pest management program that includes: inspection of incoming HWA host material; scouting of HWA host material during production process; a treatment program that specifically targets HWA; and inspection of HWA host material for export.
  3. Treat HWA host material within two days of shipment.
  4. Maintain records of scouting and treatments.

The following application must be completed and sent to Oregon Department of Agriculture, Plant Division, Nursery and Christmas Tree Program, 635 Capitol St., NE, Salem, OR 97301:
Please contact your Oregon Department of Agriculture nursery inspector at 503-986-4644 for additional questions on shipping Tsugae spp, Picea jezoensis or Picea polita to Canada after July 1, 2008.