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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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