| Hop powdery mildew regulations |
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| Introduction |
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Hop powdery mildew (HPM), caused by the fungus, Podosphaera macularis, is a damaging fungus on hop plants (Humulus lupulus). P. macularis (formerly known as Sphaerotheca humuli) is characterized by white circular patches of fungal growth on leaves. As HPM spreads, leaves and stems may appear completely covered with white fungal growth. The most severe infections result in damage to flowers or hop cones. Such severe crop infections on commercial hop plants may result in hop cones that are no longer marketable.
P. macularis was identified on commercial hop plants in the Pacific Northwest in 1997. The disease is now known to occur in California, Connecticut, Idaho, Minnesota, New Mexico, New York, Oregon, Washington, Wisconsin in the United States, and in Ontario, Canada. Other areas infected with HPM include Africa, Asia, and Europe.
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| Regulations |
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The Oregon Department of Agriculture (ODA) established quarantine against Hop Powdery Mildew, Oregon Administrative Rule 603-052-1020 in 1993. The quarantine was designed to help stem the spread of Podosphaera macularis in Oregon’s commercial hop industries.
Areas under quarantine include all states and districts of the United States, except the states of Washington and Idaho. All hop plants and parts are covered under the quarantine as well as used bale coverings and any other articles or equipment that could transmit spores or other infectious material. Kiln dried cones are excluded. Hop plants are prohibited entry into Oregon directly, indirectly, diverted or reconsigned.
Persons wishing to import covered commodities from areas under quarantine may obtain a director’s exemptions by apply in writing as authorized by OAR 603-052-1020. Applications for director's exemptions must list the prospective buyer and seller; the number, and origin of stock; location of proposed planting site; and any other relevant information. Exemptions, when granted, will list required safeguards to prevent disease establishment.
All covered commodities described found to be in violation of this quarantine shall be returned immediately to point of origin by the Oregon receiver, or at the receiver's option be destroyed under the supervision of the ODA without expense to or indemnity paid by the department.
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