Evaluation of downy mildew resistance in various accessions of wild Vitis species

摘要

107 accessions of 21 species from America and East Asia were investigated for resistance to downy mildew, Plasmopara viticola, by the leaf disc test. The species, Vitis rotundifolia, munsoniana and yenshanensis showed resistance in all accessions investigated (rating 1.0). Vitis cinerea, palmata and shuttleworthii can be rated as moderate resistant (rating 1.1 - 1.9). In V. candicans, doaniana, piasezkii, riparia, rubra and tiliifolia resistant as well as susceptible accessions were observed. In V. acerifolia, aestivalis, amurensis, champinii, lanata, rupestris, solonis, vinifera and vulpina all accessions showed susceptibility to the fungus, the rating varied from 1.1 to 7.2.