Topaz geneva rootstock trial Laboratory data 2015 -18.xls

The apple replanting disease (ARD) is a major problem in replanted apple orchards. Depressions in growth and yield are symptomatic and mainly caused by nematodes (<i>Pratylenchus</i>) and soil borne funghi <i>(e.g. Rhizoctonia</i>, <i>Phytophthora</i>, <i>Pythium).</i>For organic growers, besides bio-fumigation the use of tolerant rootstocks has been discussing to be an efficient way to prevent ARD. The purpose of this study was the evaluation of some rootstocks from Geneva in an organically treated replanted apple orchard, compared with the standard M9 and also with the stronger rootstocks M7 and MM111, which have been discussing the last years as alternatives for organic growers for extensive production systems.