SPREAD OF BERRY BACTERIOSIS ON VINE PLANTS OF VARIOUS VARIETIES IN THE LOWER DON

Information is given on the prevalence and intensity of development of bacteriosis of grape berries in the conditions of the Lower Don region. Bacteriosis of berries is caused by the bacterium Bacillus. Basically, bacteria enter the berries through the wound surface of the skin of the berries, caused by insect stings, sunburn, and other factors, although the infection of the berries with bacteria is fixed without damaging the skin. The causative agent of the disease is resistant to high temperatures and lack of moisture. The disease symptoms on the same varieties was noted not every year. The intensity of spread of bacteriosis of berries also differed by years. In 2020, signs of damage by bacteriosis of berries were noted in 30% of the studied varieties and with a greater intensity of damage, compared with 2021. The intensity of bacteriosis damage from 1.5 points and higher was noted in the varieties: VIR-1, Kabashny, Kosorotovsky, Pochatochny, Staryy Goryun, which is 13% of the observed varieties. In 17% of varieties, the intensity of the damage did not exceed 1.4 points. In 2021, bacteriosis of berries appeared in a smaller number of varieties compared to 2020 (10% of the studied ones) and with a lower intensity of damage (up to 1.5 points).