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8/18/2019 Ascomycete Pathogens Lecture
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Eastern Filbert Blight Quarantine 1921
H. P. Barss of OSU, former Botany and Plant Pathology Chair
Argued before the western plant board for a quarantine against
movement of American wild hazel (C. americana) or European
hazels (filbert) from the territory included within the natural range
of the native C. americana
“The disease is evidently natural to and presumably everywhere present on this
species of wild hazel, on which however, it is a parasite of only minor
consequence, producing only a slight twig blight...”
“The protection of the growing filbert industry of the Pacific coast has to depend,
therefore, upon the effective enforcement of the exisitng regulations which
prohibit the importation of plants, cuttings, or other propagative material of either
the American wild hazel or the cultivated filbert from the territory included
within the range of Corylus americana.”
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Quarantine worked for 50 or so years to exclude
Corylus americana nursery stock from Pacific Northwest
But ultimately the Eastern Filbert Blight pathogen,
Anisogramma anomala, was introduced into sw Washington
exactly as Barss said it would:
on infected C. americana nursery stock, from which it spread to
commercial filbert orchards.
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Hanlin, 1990
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