On the cover: Pumpkin and squash are important crops worldwide. Some of the main plant diseases affecting cultivation of pumpkin and squash include mildews, viruses, and fruit and stem rots. Development of cultivars resistant to these diseases is important for growers as it helps cut the costs associated with production. Many sources of resistance to these diseases have been identified. DNA markers linked to genetic resistance will aide plant breeders in the process of selecting plants carrying suitable resistance genes. See Sabharwal et al. (https://doi.org/10.1002/csc2.21358). Photo credit: Aaron Burden.

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封面：南瓜和南瓜是世界范围内的重要作物。影响南瓜和南瓜种植的一些主要植物病害包括霉菌、病毒以及果实和茎腐病。开发对这些疾病有抵抗力的品种对种植者来说很重要，因为它有助于降低与生产相关的成本。已经确定了对这些疾病的许多耐药来源。与遗传抗性相关的 DNA 标记将帮助植物育种者选择携带合适抗性基因的植物。参见 Sabharwal et al. （https://doi.org/10.1002/csc2.21358）。照片来源：Aaron Burden。