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Susceptibility and Inheritance of Susceptibility to Peach Leaf Curl in Peach and Nectarine Cultivars. David F. Ritchie, Assistant Professor, Department of Plant Pathology, North Carolina State University, Raleigh 27650. Dennis J. Werner, Assistant Professor, Department of Horticultural Science, North Carolina State University, Raleigh 27650. Plant Dis. 65:731-734. Accepted for publication 15 January 1981. Copyright 1981 American Phytopathological Society. DOI: 10.1094/PD-65-731.

During the spring of 1980, 67 peach and 11 nectarine cultivars were evaluated for susceptibility to peach leaf curl. No cultivar was immune; susceptibility varied greatly, however, and a wide range of symptoms was observed. Analysis of 862 progeny seedlings synthesized from 13 matings indicated that leaf curl susceptibility was heritable. Regression of progeny performance on average parental performance was b = 0.34 ± 0.19. Redhaven and most cultivars derived from Redhaven were tolerant to leaf curl, whereas Redskin and cultivars derived from Redskin were susceptible or highly susceptible.