Reaction of apple cultivars to abiotic and biotic stress factors
The study was carried out in 2015-2017 at the Institute of Agriculture - Kyustendil. The aim was to evaluate some apple cultivars from а collection at the Institute as to response to stresses (late spring frost and susceptibility of leaves and fruit to apple scab and powdery mildew). Rosana, Fuji Nagafu 6, Charden, Prima and the new Bulgarian cultivar Siyana had the best resistance to late spring frosts (-4°C). Fruit damage according to the phenological stage code 72 on the BBCH-scale, i.e., fruit size up to 20 mm, in these cultivars were around 40-50%. The most sensitive were Rubinola, Belgoden, Braeburn, Čadel, Oregon Spur and Super Chief with injuries between 80 and 90%. Rubilola, Teser T219 and Siyana showed resistance to scab and a weak sensitivity to powdery mildew, while the remaining cultivars were sensitive to these diseases.
Dimitrova, S., Sotirov, D. and Liu, M. (2020). Reaction of apple cultivars to abiotic and biotic stress factors. Acta Hortic. 1281, 67-72
spring frosts, resistance, apple scab, powdery mildew