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

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 moderate tree vigor. ‘McDonald’ is

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

filbert blight (EFB) caused by the fungus Anisogramma anomala (Peck) E. Müller with high nut yield, small nut size, early nut maturity, very good kernel quality, and high tree vigor. ‘Wepster’ is recommended for Oregon's Willamette Valley and other areas

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

and resistance to eastern filbert blight (EFB) incited by Anisogramma anomala . The tree has an upright-spreading growth habit that should be easy to manage in a landscape. The nuts are edible, although the size is smaller and yields lower than that

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Honglin Chen, Shawn A. Mehlenbacher, and David C. Smith

threatened by eastern filbert blight (EFB) incited by the pyrenomycete Anisogramma anomala (Peck) E. Müller. The fungus is endemic on the American hazelnut ( C . americana Mill.) in eastern North America. On susceptible European cultivars, it causes

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Jeff Olsen

in Oregon in 2009 produced ≈37,188 t of hazelnuts on 12,545 ha. In the mid-1980s, EFB, caused by the fungus Anisogramma anomala (Peck) E. Müller, was discovered in Oregon's main hazelnut-producing region. The blight has slowly spread and is now

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

modifications that facilitate genotyping Biotechniques 20 1004 1010 Cai, G. Leadbetter, C.W. Muehlbauer, M.F. Molnar, T.J. Hillman, B.I. 2013 Genome-wide microsatellite identification in the fungus Anisogramma anomala using Illumina sequencing and genome

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John M. Capik and Thomas J. Molnar

). European hazelnut production has been attempted in the eastern United States since colonial times. However, the relatively cold climate—and more significantly, an endemic disease called EFB caused by Anisogramma anomala —made these attempts futile

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Shawn A. Mehlenbacher, Maxine M. Thompson, and H. Ronald Cameron

`Gasaway' hazelnut (Corylus avellana L.) is highly resistant to eastern filbert blight caused by Anisogramma anomala (Peck) E. Muller. Progeny produced from controlled crosses of `Gasaway' with five susceptible genotypes and open pollination in a `DuChilly' orchard were planted in a diseased orchard and rated for symptom expression for 9 to 10 years. All progeny were found to segregate 50% resistant: 50% susceptible, indicating that `Gasaway' is heterozygous for a single dominant resistance gene.

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C.J. Coyne, D.C. Smith, S.A. Mehlenbacher, K.B. Johnson, and J.N. Pinkerton

Resistant cultivars are a promising disease control method for eastern filbert blight, which is devastating hazelnut production in Oregon. In 1990, two studies were begun to evaluate the relative resistance of European hazelnut (Coyhls avellana) genotypes to the causal fungus, Anisogramma anomala. A randomized block design of 40 genotypes was planted using inoculated trees planted in the borders as the disease source. The first- and second-year disease incidence (percent) were compared to the published disease incidence (percent) based on exposing potted trees of 44 genotypes to high doses of inoculum. Disease incidence was significantly correlated between the two studies in 1991 (r =0.41, P = 0.02) and in 1992 (r =0.64, P = 0.001; rs = 0.35, 0.025 < P < 0.050). Three genotypes, however, showed no disease in the field, but they had disease in >70% of the potted tree study. A plot of disease incidence in the field planting indicates that the inoculum was present throughout the blocks.

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Glare J. Coyne and Shawn A. Mehlenbacher

Eastern filbert blight (EFB) (Anisogramma anomala) is a serious disease of the European hazelnut (Coryls avellana). A single dominant gene for immunity to EFB from C. avellana `Gasaway' is being combined with good nut and kernel traits using a modified backcross approach. Additional sources of resistance would be highly desirable. Clones and seedlings of six other species (C. columa, C. comuta, C. heterophylla, C. sieboldiana, C. amencana, and C. jaquemontii] and a few interspecific hybrid selections were screened in the greenhouse to identify new sources of resistance. C. jacquemontii seedlings and C. columa clones were highly susceptible. C. comuta, C. hetemphylla, and C. sieboldiana clones were resistant, as were 86% of the C. americana seedlings tested. Five C. americana × C. avellana hybrids from New York were resistant under field conditions. One of four C. comuta × C. avellana and two of three C. hetemphylla × C. avellana hybrids were resistant.