While the age-related susceptibility of potatoes to late blight is well-known, the universality of this relationship is unclear. This study aimed at resolving the dilemma of the age-related susceptibility in late blight epidemics by analysing the disease progress curves of three potato cultivars (Folva, Novano and Nofy). The following epidemiological parameters were analysed: incubation period (IP), standardised apparent infection rate (SAIR), inflection point (InflPoint), time to reach 1% severity (T1) and relative area under the disease progress curve (rAUDPC). Cultivar had a pronounced effect on IP. However, neither plant age nor age × cultivar had a significant effect on IP. Overall, cultivar was the most important determinant of susceptibility to late blight. Differences between plant ages for late blight susceptibility were more evident in 2019 compared to 2020. Susceptibility to late blight increased with plant age according to rAUDPC, InflPoint and T1. Based on SAIR, younger (Folva) and middle-aged (Novano) plants were the most susceptible in 2019, whereas no differences were apparent between plant ages in 2020. Based on principal component analysis, the first component (Comp.1) accounted for ~79% (2019) and ~ 81% (2020) compared to ~21% (2019) and ~ 19% (2020) of the second component (Comp.2). Comp. 1 was strongly associated with rAUDPC, InflPoint and T1, thus, the conclusions based on these parameters, i.e. susceptibility increases with plant age, were more likely than with SAIR, which on the other hand was strongly associated with Comp.2. In conclusion, our study showed that the susceptibility of potatoes to late blight increases with plant age.

虽然马铃薯对晚疫病的年龄相关易感性是众所周知的，但这种关系的普遍性尚不清楚。本研究旨在通过分析三个马铃薯品种（Folva、Novano 和 Nofy）的病害进展曲线来解决晚疫病流行中与年龄相关的易感性的困境。分析了以下流行病学参数：潜伏期 (IP)、标准化表观感染率 (SAIR)、拐点 (InflPoint)、达到 1% 严重程度的时间 (T1) 和疾病进展曲线下的相对面积 (rAUDPC)。品种对 IP 有显着影响。然而，植物年龄和年龄×栽培品种都对 IP 没有显着影响。总体而言，品种是晚疫病易感性的最重要决定因素。与 2020 年相比，2019 年植物年龄对晚疫病敏感性的差异更加明显。根据 rAUDPC、InflPoint 和 T1，对晚疫病的易感性随着植物年龄的增加而增加。根据 SAIR，2019 年年轻 (Folva) 和中年 (Novano) 植物最易感，而 2020 年植物年龄之间没有明显差异。 根据主成分分析，第一成分 (Comp.1) 占~79% (2019) 和 ~81% (2020) 相比之下，第二个组件 (Comp.2) 为 ~21% (2019) 和 ~19% (2020)。比较 1 与 rAUDPC、InflPoint 和 T1 密切相关，因此，基于这些参数的结论，即易感性随着植物年龄的增加，比 SAIR 更有可能，另一方面，SAIR 与 Comp.2 密切相关。总之，