Abstract
In 2014, open field trials were conducted within the Core Organic 2 Project Bio-Incrop at the Research Centre Laimburg to investigate the efficacy of different treatments in reducing apple replant disease after replanting. The different treatments consisted of steaming, used by itself and in combination with calcium oxide (CaO) treatment, soil coverage with Film, and compost application. In addition, also two products based on plant extracts and compost alone were tested. All treatments were evaluated in comparison to an untreated control and the chemical reference soil fumigant Basamid® (active substance Dazomet). In both 2014 and 2015, the highest increase in trunk circumference, and highest shoot length and yield were recorded in plots treated with Basamid. Among the treatments, which are also allowed in organic farming, the treatments consisting of combinations of steaming with other treatments and the plant extract-based treatment Herbie82® were able to significantly increase the above-mentioned parameters in comparison to the untreated control. The yields, which will be achieved in the following years, will show which treatment(s) can be considered economically feasible.