Hazelnut 'Dorris'

Technology Description


‘Dorris’ inherits a gene from the cultivar ‘Gasaway’, which confers a high level of resistance to EFB; trees of ‘Dorris’ have remained mostly free of EFB, with only a few cases of small cankers under high disease pressure having been observed. Additionally, ‘Dorris’ is resistant to bud mite (primarily Phytoptus avellanae Nal.). Its nuts mature at the same time as ‘Barcelona’, have 43% kernel by weight, and a nut yield efficiency that is significantly higher. As a result, ‘Dorris’ displays versatility as a dual-purpose cultivar, has high gross yields, high nut yield efficiency and excellent resistance to EFB.


Features & Benefits


  • Excellent texture and flavor merit a premium price
  • Resistance to bud mite, EFB
  • High nut yields and smaller tree trunk size make for high yield efficiency




  • Blanched kernel market
  • Specialty products
  • Pollinizer for cultivars with late-blooming female flowers


Background of Invention


Eastern Filbert Blight (EFB), caused by the fungus Anisogramma anomala, poses a serious threat and imposes a significant added cost to hazelnut production in the Willamette Valley, which produces the majority of US hazelnuts. The hazelnut cultivar (variety) developed at Oregon State, named ‘Dorris’, is from a cross of 'Delta' and OSU 309.074. ‘Dorris’ is highly resistant to EFB and has infrequent nut defects. The trees have low vigor, similar in size to ‘Clark’, with similar nut yield per tree as ‘Barcelona’, but a much higher yield efficiency. As a dual-purpose cultivar, the larger nuts of ‘Dorris’ can be sold in-shell and the smaller nuts can be cracked out and sold on the kernel market. The kernels blanch easily and have excellent flavor and texture. ‘Dorris’ is well-suited for the blanched kernel market, for use in chocolate products, baked goods, and other premium-priced specialty nut food items.





Patent Information:
Tech ID:
Denis Sather
Senior IP & Licensing Manager
Oregon State University
Shawn Mehlenbacher
David Smith
Rebecca Mccluskey
Plant Varieties
© 2024. All Rights Reserved. Powered by Inteum