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Mint wilt regulations
Mint wilt, caused by the fungus Veticillium dahliae, is devastating to mint growers. Mint production in an infected field may decline to an uneconomic level within 5 years. During the late 1940's, Verticillium mint infections in the midwest were so severe that production was transferred to many western states, including the pacific northwest. Regrettably, the fungus was transferred along with the mint plants. Mint wilt can be found throughout the pacific northwest states, including Oregon.

Mint is regulated currently in 6 states including: Idaho, Minnesota, Montana, Nevada, Utah and Wyoming. Mint entering these states requires inspection and certification.
In Oregon, a mint wilt disease control area order is in place for Klamath and Union Counties to protect the mint industry and are summarized in Oregon Administrative Rules 603-052-0328 and 603-052-0334, respectively. This mint wilt disease control order was established to protect the mint industry in these counties. A control area is established for the protection of the mint industry in Klamath and Union counties, Oregon, against the introduction and spread of Verticillium wilt disease caused by pathogens Verticillium spp.
The following methods are to be used in the control area described in section: (a)mint propagation material imported into the control area for production of new mint fields shall be limited to greenhouse-grown, nuclear generation rooted tip cuttings certified by the Oregon State University Seed Certification Program; certified by similar official certification programs in Colorado, Idaho, Montana, or Washington; or other department-approved official certification programs of a comparable level; (b)all mint root stocks planted within the control area must be certified by the Oregon State University Seed Certification Program in Klamath County as Field Class IV or better root stocks, or have been inspected by the Oregon Department of Agriculture (ODA); (c) all farm equipment used in the commercial production of mint must be cleaned free of soil and plant debris using methods approved by Oregon State University or the ODA prior to entering the control area; (d)mint growers shall provide the ODA with complete maps showing the location of all mint fields, and whether they were planted with certified or noncertified root stocks.
The source of certification or inspection shall be shown for each field planted. Mint growers shall retain documentation of the sources of mint root stocks for any new plantings. New plantings shall be mapped and the maps submitted to the ODA on or before June 15 of each year that this control area order is in effect. The ODA shall inspect mint fields not eligible for Oregon State University certification for the presence of Verticillium wilt symptoms upon a request of the grower. Such requests shall be mailed to the ODA on or before June 15.
Phytosanitary certificates shall be issued only for those fields found free of Verticillium wilt symptoms and inspected after June 15 and prior to harvest of the mint for oil production. The ODA shall assess the established site charges for time and mileage for any such inspections. Any violation of this order shall be deemed to be in violation and subject the violator to penalties. Additionally, any mint stock found to be in violation of this Order shall be destroyed or disposed of in a manner prescribed by the ODA. This control area order will be reviewed beginning in the first quarter of 1999 by the ODA, Oregon State University, mint growers, mint oil companies and other interested parties.