The cultivation of grape varieties with partial resistance to disease may become an important component for disease management in the future. The impact of partial resistance on downy mildew epidemics according to its components have not been explored so far. This work aims to model, understand, and quantitatively analyse the effect of partial resistance against dual disease epidemics (foliage and clusters) caused by Plasmopara viticola, and rank the efficiency of different resistance components in disease suppression. We use an epidemiological simulation model to integrate the effect of four components of partial resistance, expressed as relative resistance parameters, i.e. infection efficiency (RRIE), latency period (RRLP), sporulation (RRSP), and infectious period (RRIP). Both the individual and combined effect of these components of resistance on downy mildew epidemics are evaluated through a sensitivity analysis. A comparison of simulation runs in different scenarios of disease conduciveness using experimental measurements of components of partial resistance for 16 different grapevine varieties is also performed. Increasing values of RR parameters led to a suppression of disease progress on foliage. The strongest reduction of epidemics on foliage is generated by increases in RRIE, followed by RRSP, RRIP, and last by RRLP. The effect of partial resistance on epidemics is more conspicuous in a scenario of limited disease conduciveness. The strongest suppressive effect of simulated epidemics on clusters is associated with RRIE, and the lowest effect with RRLP, with similar effects of increasing values of RRIP and RRSP. The use of experimentally measured relative resistance parameters to run simulated epidemics shows a reduction of the area under the disease progress curve from 4 × 10⁵ (on a susceptible reference grapevine variety) to 4 × 10² (on cv. Bronner), i.e. a reduction of disease by 1000. The simulation of the varietal effect in intermediate and less favourable scenarios of disease conduciveness strongly suppresses the epidemic on foliage and limits disease on clusters to very low levels. Deploying partial host plant resistance in environments that are not strongly conducive to downy mildew epidemics could represent an effective use of partial resistance.

培育部分抗病的葡萄品种可能成为未来病害管理的重要组成部分。到目前为止，尚未探讨部分抗性对霜霉病流行的影响（根据其组成部分）。这项工作旨在模拟、理解和定量分析对葡萄球菌引起的双重疾病流行（叶子和集群）的部分抗性的影响，并对不同抗性成分在疾病抑制中的效率进行排序。我们使用流行病学模拟模型来整合部分抗性的四个组成部分的影响，表示为相对抗性参数，即感染效率（RRIE）、潜伏期（RRLP）、孢子形成（RRSP）和感染期（RRIP）。通过敏感性分析评估这些抗性成分对霜霉病流行的个体和综合影响。还使用对 16 种不同葡萄品种的部分抗性成分的实验测量，对不同疾病有利情况下的模拟运行进行了比较。RR 参数值的增加导致对叶片疾病进展的抑制。叶子上流行病的最强烈减少是由 RRIE 的增加产生的，其次是 RRSP、RRIP，最后是 RRLP。在疾病有利性有限的情况下，部分抵抗对流行病的影响更为明显。模拟流行病对集群的最强抑制作用与 RRIE 相关，而 RRLP 的作用最低，与增加 RRIP 和 RRSP 值的效果相似。使用实验测量的相对抗性参数来运行模拟流行病显示疾病进展曲线下的面积从 4 × 10 和 RRLP 的效果最低，与增加 RRIP 和 RRSP 值的效果相似。使用实验测量的相对抗性参数来运行模拟流行病显示疾病进展曲线下的面积从 4 × 10 和 RRLP 的效果最低，与增加 RRIP 和 RRSP 值的效果相似。使用实验测量的相对抗性参数来运行模拟流行病显示疾病进展曲线下的面积从 4 × 10⁵（在易感参考葡萄品种上）到 4 × 10 ²（在 cv. Bronner 上），即疾病减少 1000。在中等和不太有利的疾病有利情况下的品种效应模拟强烈抑制了叶子上的流行并将集群上的疾病限制在非常低的水平。在不太利于霜霉病流行的环境中部署部分宿主植物抗性可以代表部分抗性的有效利用。