Mango sudden decline (MSD) caused by Ceratocystis fimbriata is one of the major diseases affecting mango crop in Brazil, Oman, and Pakistan. In Brazil, the main strategy for MSD management has been the use of resistant plants as rootstock for grafting. In this study, we tested the resistance of mango cultivar Ubá to C. fimbriata isolates from different populations. Firstly, we inoculated 2173 seedlings from 129 accessions of mango cv. Ubá using three representative fungal isolates from Brazil. Following the inoculation, the potential resistant plants were challenged against ten C. fimbriata isolates from Brazil and three from Oman. Finally, to confirm its resistance, clonal replicates of the resistant accessions were re-inoculated with the same fungal isolates. In the first selection, 13 accessions were pre-selected as resistant. In subsequent selections, they proved to be resistant to C. fimbriata isolates from populations from Oman/Pakistan and Southeastern Brazil. However, all 13 accessions were susceptible to fungal isolates from populations from Northeastern Brazil and Rio de Janeiro (also in Brazil). Our results reveal that mango cv. Ubá resistance to MSD is isolate specific and depends on the pathogen population. We obtained 13 mango cv. Ubá clones resistant to C. fimbriata, which may be useful as rootstock to MSD management in Oman and specific regions from Brazil.

由毛状角藻引起的芒果突然下降（MSD）是影响巴西，阿曼和巴基斯坦的芒果作物的主要疾病之一。在巴西，MSD管理的主要策略是使用抗性植物作为嫁接的砧木。在这项研究中，我们测试芒果品种UBA的电阻C.黑斑病来自不同种群的分离株。首先，我们从129种芒果简历中接种了2173株幼苗。Ubá使用三种来自巴西的代表性真菌分离株。接种后，潜在的抗性植物受到十种纤毛衣藻的攻击。从巴西分离出三株，从阿曼分离出三株。最后，为了确认其抗性，用相同的真菌分离物再次接种抗性种质的克隆复制品。在第一个选择中，预先选择了13个抗性种质。在随后的选择中，他们被证明对来自阿曼/巴基斯坦和巴西东南部的种群的纤毛梭状芽孢杆菌具有抗性。但是，所有13个种质均易感染来自巴西东北部和里约热内卢（也是巴西）人群的真菌分离株。我们的结果揭示了芒果简历。乌巴对MSD的抗性是分离株特异的，并取决于病原体种群。我们获得了13个芒果简历。UBA克隆耐C.黑斑病，可以用作阿曼和巴西特定地区MSD管理的砧木。