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Dutch elm disease regulations
Introduction
Ophiostoma ulmi (formerly Ceratocystis ulmi), the plant pathogen that causes Dutch elm disease (DED) was introduced to the United States in Ohio on elm logs from the Netherlands in 1930. The disease infected live trees and rapidly spread across the United States. By 1980, the pathogen was confirmed in all the pacific coast states. DED attacks native species of elm with American elm, Ulmus americana, being the most susceptible.
 

Regulations
A quarantine was established against Dutch elm disease and elm yellows phytoplasma, elm phloem necrosis, in November 1976 under Oregon Administrative Rules (OAR) 603-052-0114 to stop the continued spread of the diseases. In Oregon, the counties of Benton, Clackamas, Jackson, Lane, Linn, Malheur, Marion, Multnomah, Polk, Union, Washington, and Yamhill are under quarantine for DED. All states and districts of the United States except Alaska, Arizona, Florida, Hawaii, Louisiana, New Mexico and Utah are also under quarantine. This quarantine prohibits entry of all parts of the Ulmus sp. and the related genera Zelkova and Planera into the state of Oregon from quanantined areas. Seed and tissue culture plantlets are exempt and allowed. All tools or equipment utilized in the pruning or disposal of infected commodities are also prohibited entry into the state of Oregon unless they are decontaminated by an approved method.
 
Elm and related genera from non-quarantined areas may be permitted entry into the state of Oregon if each lot or shipment is accompanied by a certificate issued by an official state agency. The certificate must include the state of origin and the kind and amount of commodities covered by the certificate. The certificate must also affirm that all such commodities are a product of the state from which shipped or of another state within which neither DED nor elm yellows phytoplasma is known to occur, and that such commodities are free from the described disease.
 
Commodities restricted within quarantine areas, with the exception of commercially produced nursery stock, are prohibited movement within or outside non-quarantined areas except for the transportation of such commodities to locations authorized by the department for the burning, burial, or other approved method of disposal thereof. All tools or equipment utilized in the pruning or disposal of infected commodities are also prohibited movement within or outside said areas unless they are decontaminated by an approved method.
 
Commercial producers of elm nursery stock in Oregon can apply for a director's exemption allowing them to import elm species from quarantined states. To qualify for the exemption, the plants must be kept in an insect proof screenhouse for one growing season and visually inspected by the nursery inspector for the presence of DED. The plants must also be laboratory tested for elm yellows phytoplasma before being released from quarantine.