PREVALENCE OF WHITE ROT IN VINEYARDS OF ROSTOV REGION

Abstract

Information is provided on the prevalence and intensity of development of white rot on plants of different vine varieties during the growing season 2019–2020. It was found that the intensity of development of white rot var-ied from year to year. The meteorological conditions in 2019 contributed to the in-creased harmfulness of white rot: hot weather in June with air temperatures up to 37.2 °C, causing sunburn in plants, as well as moder-ately hot weather in July with frequent, albeit abundant precipitation, contributed to the de-velopment of white rot on plants of unstable varieties. In 2020, the intensity of infection by the pathogen did not exceed 1 point in most varieties, since the decrease in the harm-fulness of white rot in 2020 was facilitated not only by the corresponding meteorological conditions, but also by timely protective treatment of plants against white rot. Signs of white rot both in 2019 and in 2020 were ob-served in varieties: Riesling Reinsky, Olkhov-sky, Neizvestniy Donskoy, Krasnostop Zolotovsky. The absence of signs of damage by the phytopathogen was noted in the varie-ties: Burgunskiy, Buriy, Nakutvneuli, Pocha-tochniy, Tavrosi, Tashkentsky.