Comparative evaluation of the response to downy mildew (Plasmopаra viticola) of newly introduced in Bulgaria table grapevine cultivars

Vilina Petrova, Simeon Krumov

Abstract: The researches were conducted during the period 2016 - 2018 under field conditions in a collection vineyard at the Institute of Agriculture - Kyustendil. The object of the survey were the newly introduced from China table grapevine cultivars with interspecific origin - Kyoho, Shzn nong jin huanghou, Bixiang Wuhe, Wuhzhanxiang mi, as well as cultivar Garant, established in the Institute of Viticulture and Enology - Pleven. It was found that all investigated cultivars have less susceptibility to mildew (Plasmopara viticola) compared to the standard Super early Bolgar, which is from the group of Vitis vinifera L. The highest resistance to the pathogen in all studied years had the cultivar Garant, which also has interspecific origin. The cultivars Wuhzhanxiang mi, Kyoho and Shzn nong jin huanghou also have a low rate of attack. The vines of these cultivars quickly form necrotic spots on the leaves, limiting the spread of the pathogen in the tissues. The higher resistance to downy mildew (Plasmopara viticola) of the introduced cultivars compared to the control is genetically determined and is due to their interspecific origin.

Keywords: cultivar; grapevine downy mildew (Plasmopara viticola); rate of attack; sensitivity; vine

Date published: 2020-05-07