‘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
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.