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    Black walnut is native to the eastern USA and prized for its high-quality timber. Walnut anthracnose, the most important foliar disease of black walnut, is caused by Gnomonia leptostyla. There is no germplasm available that is resistant to the disease. Ramets of 42 black walnut clones, comprising about one-third of the Midwestern USA black walnut timber breeding stock, were rated for susceptibility to walnut anthracnose from 1974 to 1982. Significant differences in susceptibility were identified among clones. A method of truncation selection was able to identify the most resistant clones in less time and with a smaller commitment of resources than methods based on means. Truncation selection permitted the identification of the most susceptible clones even in years when the severity of anthracnose was low.

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    Woeste, K.E.; Beineke, W.F. 2001. An efficient method for evaluating black walnut for resistance to walnut anthracnose in filed plots and the identification of resistant genotypes. Plant Breeding 120, 454-456 (2001)


    Juglans nigra, anthracnose, truncation selection, disease resistance

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