Rootstock resistance to apple replant disease
Modern apple growing requires relatively often orchard replacement due to release of superior cultivars or introduction of new growing technologies. Most of intensive apples orchards are established in the same site where apple trees were cultivated for a long period. Continuous cultivation of the same crop causes stress to plants and often leads to abnormal plant development and decreased productivity what is known as apple replant disease (ARD). Due to ban of chemical soil disinfection, other strategies how to overcome ARD must be developed. Rootstock is becoming to be one of the most important factors to solve this problem and one of the targets of new rootstock breeding programs is rootstock resistance or tolerance to ARD. Different origin and genetic background of rootstocks led to suggest that their adaptiveness to replanted soil will be different. EUFRIN (European fruit research institutes network) Apple and pear cultivar and rootstock testing group established replant trials in several European countries where new apple rootstocks from USA, Great Britain, Poland and Russia are tested. Current paper presents results of the trial performed at the Institute of Horticulture, Lithuanian Research Centre for Agriculture and Forestry in 2017-2021. On average of all rootstocks apple trees planted in the fresh soil were by 35% more vigorous and gave 71% higher yield. After the evaluation of tree growth and productivity characters rootstocks G.41 and G.11 were the most tolerant to ARD. Trees on rootstocks G.935, Cepiland-Pajam®2 and EM_02 had significantly lower yields in replant soil, while tree growth was most stunted on 62-396-B10® and EM_02.
Kviklys, D., Abukauskas, V., Lanauskas, J. and Uselis, N. (2023). Rootstock resistance to apple replant disease. Acta Hortic. 1372, 295-300
Malus × domestica Borkh., replant soil, productivity, stress, vegetative development