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Megan F. Muehlbauer, Josh A. Honig, John M. Capik, Jennifer N. Vaiciunas, and Thomas J. Molnar

, 2013 ). Ninety-nine percent of U.S. production comes from the Willamette Valley of Oregon. The lack of commercial hazelnut production in the eastern United States is largely the result of the disease EFB caused by the fungus Anisogramma anomala

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John M. Capik and Thomas J. Molnar

solely in the Willamette Valley of Oregon, with 99% of U.S. hazelnut crop originating there ( Mehlenbacher and Olsen, 1997 ). The presence of the disease EFB, caused by Anisogramma anomala , has historically prevented the commercial production of

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Merve Şekerli, Golnaz Komaei Koma, Jacob W. Snelling, and Shawn A. Mehlenbacher

from Oregon State University (OSU) have been planted. Eastern filbert blight (EFB), caused by the pathogen Anisogramma anomala , is the most destructive disease of hazelnut in Oregon. The pathogen is endemic to eastern North America, where it

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Shawn A. Mehlenbacher, David C. Smith, and Rebecca L. McCluskey

combines a high level of resistance to eastern filbert blight (EFB) caused by the fungus Anisogramma anomala (Peck) E. Müller with high nut yield, small to medium nut size, high kernel percentage, early nut maturity, excellent kernel quality, and a

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Shawn A. Mehlenbacher, David C. Smith, and Rebecca L. McCluskey

by the fungus Anisogramma anomala (Peck) E. Müller and bud mites (primarily Phytoptus avellanae Nal.) with high nut yield, medium nut size, attractive nuts and kernels, and excellent kernel flavor. Compared with the standard ‘Barcelona’, ‘Dorris

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Shawn A. Mehlenbacher, David C. Smith, Rebecca L. McCluskey, and Maxine M. Thompson

Anisogramma anomala (Peck) E. Müller. Origin ‘Tonda Pacifica’, tested as OSU 228.084, resulted from a controlled cross of ‘Tonda Gentile delle Langhe’ (Clone O-15) and OSU 23.024 made in 1981 by Maxine M. Thompson ( Fig. 1 ). ‘Tonda Gentile delle Langhe’ is

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Shawn A. Mehlenbacher, David C. Smith, and Rebecca L. McCluskey

resistance to eastern filbert blight caused by Anisogramma anomala (Peck) E. Müller conferred by a dominant allele from ‘Gasaway’. Pollen of ‘Epsilon’ and ‘Zeta’, released in 2002 ( Mehlenbacher and Smith, 2004 ), is shed late but expresses S 1 and so is

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Shawn A. Mehlenbacher, David C. Smith, and Rebecca L. McCluskey

Anisogramma anomala (Peck) E. Müller with high nut yield, early nut maturity, high kernel percentage, and good kernel quality. Compared with ‘Barcelona’, Oregon's leading cultivar, ‘Yamhill’ has smaller trees, slightly higher nut yield, twice the nut yield

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Shawn A. Mehlenbacher, David C. Smith, and Rebecca L. McCluskey

blight (EFB) caused by the fungus Anisogramma anomala (Peck) E. Müller with high nut yield, large nut size, and good kernel quality. Compared with ‘Barcelona’, Oregon's leading cultivar, ‘Jefferson’ has smaller trees, higher nut yield, and much higher

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Shawn A. Mehlenbacher and David C. Smith

(EFB) caused by Anisogramma anomala (Peck) E. Müller. Origin ‘Red Dragon’, tested as OSU 897.078, resulted from a cross of OSU 487.055 × OSU 367.039 ( Fig. 1 ) made in 1997. OSU 487.055 is from a cross of ‘Contorta’ (syn. Corylus avellana var