The root-lesion nematode, Pratylenchus thornei, and the crown rot fungus, Fusarium culmorum, cause tremendous damage to a wide range of grain crops, resulting in significant economic losses in the global yield production. The presence of both pathogens simultaneously in cereal fields puts more pressure on breeding programs, restricting new resistant cultivars to express their potential. This study investigated 150 spring wheat lines of the 18KASIB-CORE nursery for their host suitability to P. thornei and F. culmorum, inoculated singly or in combination. Forty-eight lines were resistant to P. thornei, while 16 lines were moderately resistant to F. culmorum. Among these, nine lines maintained their resistance reaction against the complex disease involving both pathogens, while only four lines provided resistance against individual and combined infestations. Infestation scenarios of both pathogens were monitored for each resistant variety and predicted using both reproduction factor and disease index. Pratylenchus thornei downgraded all resistant lines to F. culmorum, facilitating infestation and making their severity more pronounced (169% cumulative damage) with a negative impact on yield performance. These findings are useful for improving nematode × fungus resistance in wheat and selecting promising germplasm for breeding purposes against both diseases.

根部病变线虫Pratylenchus thornei和冠腐真菌Fusarium culmorum对多种粮食作物造成巨大破坏，给全球产量生产造成重大经济损失。谷物田中同时存在两种病原体给育种计划带来了更大的压力，限制了新的抗性品种发挥其潜力。本研究调查了 18KASIB-CORE 苗圃的 150 个春小麦品系的宿主对P的适宜性。索内和F。culmorum，单独接种或联合接种。48 个品系对P具有抗性。索内，而 16 个品系对F具有中等抗性。文化。其中，九个品系对涉及两种病原体的复杂疾病保持抗性反应，而只有四个品系对个体和联合侵染提供抗性。针对每种抗性品种监测两种病原体的侵染情况，并使用繁殖因子和疾病指数进行预测。Pratylenchus thornei将所有抗性品系降级为F。文化，促进侵染并使其严重程度更加明显（169％的累积损害），对产量表现产生负面影响。这些发现有助于提高小麦对线虫 × 真菌的抗性，并为抗两种疾病的育种目的选择有希望的种质。