Originally from Oregon (USA) by the University of Corvallis (USOR 15-71). It is a hybrid of Coryluscolurna x Corylusavellana which presents a low production of suckers. It has high vigor and a good grafting affinity with the vast majority of varieties. Used as a rootstock, it improves the vigor of the varieties, as well as the production of their fruits, both in size and weight. Its rind is clear and quite soft. It has some susceptibility to the fungus Annisogrammaanomala that causes the disease Eastern filbertblight (EFB).
It was obtained in Oregon by the University of Corvalis (USOR 7-71), by the cross between Coryluscolurna x Corylusavellana presenting the peculiarity of offering a smaller number of regrowths, a characteristic inherited from Coryluscolurna. The trees grafted in Newberg offer great vigor and high productivity. It has a great sensitivity to the eastern hazelnut disease.
Variety of French origin, obtained by the IRTA. Very vigorous and productive with little capacity for regrowth, and late budding and flowering. Of thick and homogeneous fruit, and whose rind has a light brown hue. Merveille de bollwiller is used as a pollinator for Corabel. It presents a requirement of high cold hours, above 1100 hours. Its maturation occurs at the end of September and it shows good behavior against bacteriosis and Phytophthoraspp.
Native variety from the Washington region (USA), with medium-weak vigor and high productivity. It requires soils that present good drainage, preferably in sunny or slightly shaded areas. It requires a high requirement of cold hours, located above 1100 hours. Fast fruiting and late maturing, the Ennis variety has a low tendency to sprout and a high density in its branching. It has a medium-large fruit of a rounded shape, with a medium thick peel of light brown and striped hue, which is collected from the end of August to the beginning of September.
The Butler variety is native to the United States. It has a straight habit, with a low branching density, low sprouting capacity and late blooming. It has a high requirement of cold hours. It has a capacity of entry into production quite
fast. Its fruit is long and thick, presenting a light brown skin. Despite being quite sensitive to Phytophthoraspp and bacteriosis, it is a rustic and very vigorous hazelnut.
It is a rustic and highly vigorous hazelnut with a semi-straight appearance, with late blooming and overflowing, and a low regrowth capacity. It has a rapid entry into fruiting and the ripening of its fruit occurs at the end of September, presenting a large-caliber, conical fruit. It is not very sensitive to bacteriosis and resistant to Phytophthoraspp.
Little vigorous tree with strong regrowth and moderate branching density. Its requirement of cold hours does not exceed 800 hours. It has a high
productivity, early fruiting and very late maturing. It is a very old variety of Italian origin that has a large fruit with a thick, light brown skin. Low susceptible to Easternfilbertblight disease (EFB) caused by the fungus Annisogrammaanomala.