For fungal cyclic epidemics on annual crops, the pathogen carry-over is an important but poorly documented step. Plant resistance affects the pathogen development within the epidemics but we lack data on the inter-annual transmission of inoculum. For Leptosphaeria maculans on 15 oilseed rape genotypes in field during 4 growing seasons, stem canker severity was visually scored at harvest. The number of fruit bodies produced on incubated stubble was quantified using an automated image analysis framework. Our results confirm that fruit body production increases with disease severity and is significantly affected by host genotype and nitrogen supply. Tracking individual stems through incubation, we confirm for the first time that the oilseed rape genotype has a direct effect on inoculum production, not only disease severity. This major effect of genotype on inoculum carry-over should be taken into account in models of varietal deployment strategies.

对于一年生作物上的真菌循环流行，病原体携带是一个重要但记录不足的步骤。植物抗性影响流行病中病原体的发育，但我们缺乏关于接种物年际传播的数据。对于十字花科小球腔在 4 个生长季节的田间 15 种油菜基因型中，在收获时对茎溃疡病严重程度进行目视评分。使用自动图像分析框架量化孵化残茬上产生的子实体数量。我们的结果证实，子实体产量随疾病的严重程度而增加，并受宿主基因型和氮供应的显着影响。通过孵化跟踪单个茎，我们首次确认油菜基因型对接种物产生有直接影响，而不仅仅是疾病严重程度。在品种部署策略模型中应考虑基因型对接种物结转的主要影响。