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Oak wilt disease regulations
Oak Wilt Disease (OWD), caused by the fungus Ceratocystis fagacearum, kills all native species of oak trees. The pathogen is believed to be native to the United States and was first recognized as an important disease in 1944 in Wisconsin. It has been found in 21 states throughout the Midwest, Northeast and Texas in native stands. The disease has not been found in Oregon or any western states to date.

A quarantine was established against OWD on April 1, 1976 and includes all states and districts of the United States.  All rooted trees, seedling plants, cuttings, scions, bark, leaf mold, roots, or other unpeeled parts, except seed of all species of oak (Quercus spp.), chestnut (Castanea spp.), chinquapin (Castanopsis spp) and tanbark oak (Lithocarpus densiflora) are included.   These commodities may be permitted entry into Oregon provided each lot or shipment is accompanied by a certificate issued by an official agency of the state of origin certifying that all commodities covered by the certificate are free of OWD and are a product of the state from which shipped or of another state, neither of which is known to have oak wilt disease.