In Brazil, avocado nursery trees are traditionally grafted onto seedling rootstocks obtained from chance seedling trees of unknown origin, which results in great tree variability within the commercial orchards. This study aimed at comparing the horticultural performance of ‘Hass' avocado trees grafted onto seedling rootstocks and onto ‘Dusa’ clonal rootstocks, a well-known root-rot tolerant cultivar. Both rootstocks were studied in an ‘Hass’ avocado orchard between year 4 to 8 after planting, by assessing individual fruit yield (number of fruit and kg plant⁻¹), tree size, yield efficiency, Phytophthora cinnamomi presence in the soil under the canopy and fruit quality variables, such as weight, length (L), diameter (D) and L:D ratio. Postharvest fruit quality was evaluated under cold storage at 5°C and ± 85% relative humidity (RH) during a 28-day period. Along a 5-year period,‘Hass’ avocado trees grafted onto ‘Dusa’ clonal rootstock yielded a larger number of bigger and more elongated fruits per tree, which were classified within the most valued fruit size classes in the market, as compared to ‘Hass’ trees grafted onto seedling rootstocks. No significant differences were found between rootstocks regarding postharvest fruit quality or the abundance of P. cinnamomi in the soil under tree canopy.

在巴西，鳄梨苗圃传统上嫁接在来自未知来源的偶然幼苗树的幼苗砧木上，这导致商业果园内的树木变异性很大。本研究旨在比较'Hass' 鳄梨树嫁接到幼苗砧木和'Dusa' 克隆砧木（一种著名的抗根腐病品种）的园艺性能。两种砧木在种植后第 4 年至第 8 年期间在“Hass”鳄梨园中进行了研究，通过评估单个果实产量（果实数和植物公斤数^-1）、树的大小、产量效率、肉桂疫霉存在于土壤中的冠层和果实质量变量，例如重量、长度 (L)、直径 (D) 和 L:D 比。在 28 天期间，在 5°C 和 ± 85% 相对湿度 (RH) 的冷藏条件下评估采后果实质量。在 5 年的时间里，嫁接到 'Dusa' 克隆砧木上的'Hass' 鳄梨树每棵树结出了更多更大、更细长的果实，这些果实被归类为市场上最有价值的果实大小等级，与哈斯的树嫁接到幼苗砧木上。在采后果实质量或树冠下土壤中肉桂的丰度方面，砧木之间没有发现显着差异。