Abstract
Information on the prevalence and harmfulness of oidium on grapevine plants of various varieties in the conditions of the Don ampelographic collection is presented. It was found that the corresponding meteorological conditions in 2019, 2020: moderate air temperature and high humidity in the spring months, as well as in July, the presence of foci of infection on the ampelocollection contributed to the epiphytotic development of oidium. The first signs of the pathogen were detected at the end of flowering - beginning of berry growth. During the growing season, despite the protective treatments against powdery mildew, the degree of pathogenic lesion exceeding 3.5 points was observed in 2019 in 88% of the studied varieties, in 2020 - in 20% of the varieties. The smallest degree of mildew infection (up to 1.5 points) in 2020 was noted in the varieties Tavrosi, Kumshatskiy beliy, Kumshatskiy cherniy.
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