Hemlock Woolly Adelgid Quarantine Requirements

The Wisconsin Department of Agriculture, Trade and Consumer Protection has imposed an exterior quarantine on items that could carry hemlock woolly adelgid. An exterior quarantine restrict imports of some hemlock products from areas infested with HWA. 

Areas Covered by the Quarantine

The quarantine applies to the entire states of Alaska, California, Connecticut, Delaware, Maryland, Massachusetts, New Jersey, Oregon, Rhode Island and Washington; and to selected counties in Georgia, Kentucky, Maine, Michigan, New Hampshire, New York, North Carolina, Ohio, Pennsylvania, South Carolina, Tennessee, Vermont, Virginia and West Virginia. 

Complete list of states and counties covered by the quarantine 

US Forest Service Map showing the HWA infestation area 

Items Covered by the Quarantine

Hemlock seedlings, hemlock nursery stock, hemlock logs or lumber with bark; uncomposted hemlock chips with bark, uncomposted hemlock bark. 


Individual shipments of hemlock nursery stock or other hemlock products from the regulated area may enter Wisconsin if accompanied by a phytosanitary certificate from the state of origin certifying inspection and, if needed, treatment.  

Hemlock products may also be exempt from the quarantine if importing nurseries or other businesses set up a compliance agreement with DATCP. The agreement must document the  source, date, size, method and frequency of hemlock shipments, as well as import conditions that effectively prevent the spread of HWA. 

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