Diplocarpon coronariae causes apple blotch, which results in significant economic losses. Resistance to apple blotch in commercial apple cultivars has not been reported in recent literature. The Malus germplasm collection from the Fruit Genebank of the Julius Kühn-Institut that is maintained in Dresden, Germany consists of 516 accessions of about 49 Malus species. This apple gene pool was evaluated for resistance to Diplocarpon coronariae. A four-year field survey was subsequently followed by artificial inoculation of field-selected accessions. Fifteen accessions that represent nine different species and hybrids were confirmed to be highly resistant following a repeated inoculation assay in the laboratory. The results from this investigation is of high interest to breeders for future apple breeding programmes and investigations of resistance to Diplocarpon coronariae.

双冠龙可能引起苹果斑病，从而造成重大的经济损失。在最近的文献中尚未报道对商业化苹果品种中的苹果斑点的抗性。在德国德累斯顿维护的朱利叶斯·库恩研究所水果种质库中的海棠种质资源包括约49种海棠属的516个种质。评估了该苹果基因库对双冠龙的抵抗力。随后进行了为期四年的田野调查，然后人工接种了田间种质。在实验室中进行反复接种试验后，代表9个不同物种和杂种的15个种质被证实具有高度抗性。这项研究的结果对于未来的苹果育种计划和对龙骨龙的抗性调查的育种者十分感兴趣。