Assessment of the red raspberries resistance to fungal diseases in the Orel region

The research was carried out at the Russian Research Institute of Fruit Crop Breeding in 2018-2019 on the collection site of the red raspberry, established in spring 2015. The aim of the research was to identify genotypes showing high field resistance to major fungal diseases for the use in breeding and production. The research objective was evaluation of raspberry varieties for resistance to anthracnose (Elsinoe veneta Burh.), septoria spot (Septoria rubi West) and spur blight (Didymella applanata Niessl.) in the field. The research objects were 11 varieties and 6 hybrid forms of raspberries, of various genetic origin. The study of the resistance to fungal diseases was carried out in accordance with the program and methodology of the variety study of fruit, berry and nut crops. As a result of the studies of numerous raspberry varieties, no immune to Septoria spot varieties were found, though some resistant varieties to this desease were identified. In the conditions of the Orel region, these include the varieties Brigantina, Peresvet, Skromnitsa, Sputnitsa, Rannyaya zarya and forms 9-24, 9-17, 9-70, the damage of which was less than 1 point. The variety Lazarevskaya showed the least resistance to Septoria spot. According to the results of the assessments, cultivars 8-70, 9-17, Peresvet, 9-35, 9-24 and Rannyaya zarya showed high resistance to anthracnose - the damage was less than 1 point. The maximum damage was observed in the varieties Fantazia - 1.7 points, and Lazarevskaya - 2 points, which characterizes the average resistance to this disease. An assessment of the resistance of raspberries to spur blight was also carried out. The degree of the damage, depending on the variety, ranged from 0.5 to 1.2 points. Moreover, high resistance to the studied disease characterized most of the forms; the only exception was the Fantazia variety, which was classified as resistant (1.2 points).