TY - JOUR T1 - Evaluating Grapevine Cultivars for Resistance to Anthracnose Based on Lesion Number and Length JF - American Journal of Enology and Viticulture JO - Am. J. Enol. Vitic. DO - 10.5344/ajev.2012.11109 SP - ajev.2012.11109 AU - Atsushi Kono AU - Akihiko Sato AU - Masaaki Nakano AU - Masahiko Yamada AU - Nobuhito Mitani AU - Yusuke Ban Y1 - 2012/03/20 UR - http://www.ajevonline.org/content/early/2012/03/09/ajev.2012.11109.abstract N2 - Anthracnose is one of the most detrimental diseases of grapevines in humid regions. To lessen the risk of crop damage and to reduce fungicide application, resistant cultivars are needed. In this study, we evaluated the resistance of grapevines to anthracnose caused by Elsinoƫ ampelina (de Bary) Shear in two ways: (1) the resistance against ingress was evaluated using the number of lesions; and (2) the resistance against colonization was evaluated using the lesion length. First, we evaluated both forms of resistance in 13 cultivars in a detached-leaf assay for 3 years using greenhouse-grown cuttings. Both lesion number and lesion length revealed a genetic component of the resistance, with greater phenotypic variation among interspecific hybrid cultivars than among V. vinifera cultivars. The detached-leaf assay revealed significant differences in lesion length among V. vinifera accessions; Exotic and Perlette showed moderate resistance. We also measured lesion diameters in a fungicide-free vineyard to evaluate the resistance of six cultivars, and found significant differences among the cultivars. The lesion shape in susceptible cultivars was almost circular, whereas that in resistant cultivars was usually irregular. Our results show that evaluations based on the lesion number and length can reliably predict resistance to anthracnose without the need for large field trials, and that some V. vinifera cultivars exhibited moderate resistance to this disease. ER -