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Oregon Agricultural Experiment Station Technical Paper No. 11557. This research was supported in part by the Oregon Hazelnut Commission and a specific cooperative agreement with the U.S. Dept. of Agriculture, Agricultural Research Service

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33 POSTER SESSION 6 (Abstr. 513-529) Fruits/Nuts/Berries: Breeding and Genetics

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can become infested with filbertworm larvae ( AliNiazee, 1983 ; Walton and Chambers, unpublished data). Hazelnut cultivars and new breeding selections are ranked for their resistance or susceptibility to various diseases and pests. These include

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Hazelnut Commission and USDA-CSRS special grant 91-34242-5922. The cost publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this

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( Rehder, 1947 ; Kasapligil, 1972 ; Mehlenbacher, 1991 ; Thompson et al., 1996 ). The commercially important European hazelnut ( Corylus avellana L.) is native to most of Europe, Turkey, and the Caucasus mountains, and wild populations can be found in

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resistance to EFB ( Mehlenbacher and Thompson, 1991a ). Since its discovery, the ‘Gasaway’ source of resistance has been widely used in the OSU hazelnut breeding program, leading to the release of EFB-resistant pollinizer cultivars ( Mehlenbacher and Thompson

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State University (OSU) european hazelnut breeding program, resulting in the release of many advanced generation european hazelnut cultivars ( Mehlenbacher et al., 2009 , 2011 , 2013 , 2014 , 2016 ) and pollinizers ( Mehlenbacher and Smith, 2004

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goal of the Oregon State University (OSU) hazelnut breeding program. Complete resistance to EFB was first discovered in the obsolete pollinizer ‘Gasaway’ ( Cameron, 1976 ). Genetic studies showed that complete resistance is conferred by a single

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Corylus avellana L. (Betulaceae) represents an economically important crop in the European Community, particularly in the biogeographic Mediterranean basin ( http://www.fao.org/ ). Hazelnuts are produced principally in Turkey, Italy, the United

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91 POSTER SESSION 10 (Abstr. 050-084) Genetics/Breeding/Biotechnology Friday, 30 July, 1:00-2:00 p.m.

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