S.J. Wertheim
From 1981 onward, 22 walnut cultivars were evaluated in non-irrigated and non-sprayed plots with two to three one-tree replicates per cultivar at the Research Station for Fruit Growing in Wilhelminadorp, The Netherlands. Until 1994, Broadview was the most precocious and productive cultivar. In decreasing order, Solèze, Nr.139, Nr.1247, Buccaneer, Parisienne, and Nr.26 also were fairly productive. Franquette lagged behind and had high percentages of poor kernels. Four cultivars were grubbed prematurely: Nr.120, Weinsberg l, Esterhazy II, and Corne (high disease and/or frost susceptibility, and low productivity). Some cultivars planted in the period 1986–1988 already proved quite productive (Adams 10, Pedro, and Tehama), as opposed to others (Chandler, Chase, Hartley, Howard, Lara, Sibisel 39, and Sunland), some of which were grubbed already because of too low early cropping. The work indicates that some cultivars might have potential for walnut growing in Northern areas.
Wertheim, S.J. (1997). WALNUT-CULTIVAR EVALUATION IN THE NETHERLANDS. Acta Hortic. 442, 425-428
DOI: 10.17660/ActaHortic.1997.442.67
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Acta Horticulturae