Abstract
Received for publication 26 Dec. 2001. Accepted for publication 18 Mar. 2002. Oregon Agricultural Experiment Station Technical Paper no. 11849. E-mail: mehlenbs@bcc.orst.edu ‘Rosita’ is a new red-leafed hazelnut (Corylus L. hybrid) cultivar for the ornamental market. It was released by the Oregon Agricultural Experiment Station in Apr. 1999. Compared to other red-leafed ornamental hazelnut cultivars, ‘Rosita’ has a more desirable upright but compact growth habit and darker leaf color, and the leaf edges have a ruffled appearance. ‘Rosita’ produces few catkins and nuts. It has moderate resistance to eastern filbert blight (EFB) caused by Anisogramma anomala (Peck) E. Muller and big bud mites (primarily Phytoptus avellanae Nal.). ‘Rosita’ is the first ornamental cultivar to be released by the Oregon State Univ. (OSU) hazelnut breeding program.
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