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.

苹果重茬病（Apple Replant Disease, ARD）是重茬苹果园的主要生产障碍。植株生长受抑与产量降低为其典型症状，致病因子主要为短体属线虫（*Pratylenchus*）及土传真菌，包括立枯丝核菌属（*Rhizoctonia*）、疫霉属（*Phytophthora*）与腐霉属（*Pythium*）。对于有机种植户而言，除生物熏蒸技术外，耐重茬砧木的应用被认为是防控苹果重茬病的高效途径。本研究旨在对经有机处理的重茬苹果园中栽植的部分日内瓦系列砧木开展评估，并将其与标准砧木M9，以及近年来被有机种植户用于粗放生产系统的备选强长势砧木M7与MM111进行对比分析。