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| ACCESSION | PLANT NAME | TAXONOMY | ORIGIN | GENEBANK | IMAGE | AVAILABILITY | RECEIVED | SOURCE TYPE | SOURCE DATE | COLLECTION SITE | COORDINATES | ELEVATION | HABITAT | IMPROVEMENT LEVEL | NARRATIVE | | |
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| 0 | PI 617268 | 'Clark' | Corylus avellana L. | Oregon, United States | COR |  | Not Available | 2000 | DEVELOPED | 01/1999 | | | | | Cultivar | Release of 'Clark' Hazelnut. The Oregon Agricultural Experiment Station announces the release of a new hazelnut (Corylus avellana L.) cultivar. 'Clark' has smaller trees, higher yield efficiency, higher percent kernel, and kernels that are more easily blanched than the standard 'Barcelona'. The nuts fall free of the husk at maturity and can be mechanically harvested about 8 days earlier than 'Barcelona'. 'Clark', tested as OSU 276.142, resulted from a cross of 'Tombul Ghiaghli' from Greece with'Willamette' made in 1982. Light roasting and rubbing removes most of the pellicle of 'Clark' kernels, making them suitable for sale on the blanched kernel market. 'Clark' has a higher frequency of moldy kernels than 'Barcelona' but fewer than 'Willamette'. 'Clark' has a high level of quantitative resistance to eastern filbert blight caused by Anisogramma anomala (Peck) E. Muller, as determined by measuring the cankers which developed after exposure of potted trees under structures topped with diseased wood. Although not immune to eastern filbert blight, growers should be able to manage orchards of 'Clark' in the presence of the disease. Resistance to big bud mite (primarily Phyloplus avellanae Nal.) is also good. 'Clark' has incompatibility alleles S3 and S8. Both alleles are expressed in the stigmas and pollen. Female anthesis is very late, even later than 'Ennis'. Therefore, very late-shedding pollinizers are needed. 'Hall's Giant' is recommended for the earliest females to emerge.Very late-shedding OSU selections are recommended as pollinizers for the peak of female anthesis. 'Clark' is being released as a public variety and may be propagated without restriction. A list of nurseries propagating trees of 'Clark' may be obtained from the industry web site (www.oregonhazelnuts.org) or S. A. Mehlenbacher, Dept. of Horticulture, 4017 Agricultural and Life Sciences Bldg., Corvallis, OR 97331-7304. | 1598257 | PI 617268 |