Abstract Wheat is the most commonly grown cereal crop in Europe and in major parts of Europe the most yield limiting disease is Septoria tritici blotch (STB) caused by Zymoseptoria tritici. Currently, the control of the disease depends on cultivar resistance and substantial input of fungicides. The impact of using mixtures of elite cultivars as an alternative was investigated through a meta-analysis based on trial data from the Danish national cultivar testing. The cultivar testing includes a four-way cultivar mixture every year and in these trials STB severity and yield have been monitored at multiple locations between 1995 and 2017. Results from 19 years of cultivar testing trials provided a data set for 406 trials from which the effect of mixtures was evaluated. The meta-analysis revealed that cultivar mixtures reduced STB severity with 10.6% and increased yields with 1.4% across all trials. The effects were greatest in untreated trials where STB severity was reduced with 17% and yields increased with 2.4%. The mixtures did not only perform better than the average of their component cultivars grown as pure stand, they also performed better than the average of the four most grown cultivars in a given year. No relationship was found between disease pressure or location and the performance of the mixtures. The mixtures included in the cultivar testing were not designed to control STB and the results are therefore perceived as a baseline to the attainable disease control from mixtures. The use of cultivar mixtures is relevant for low input farming systems, but can also contribute to disease control in intensive farming systems. Cultivar mixtures have the potential to minimise dependency on fungicides as an important element in integrated pest management.

中文翻译：

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冬小麦品种混合物防治小麦斑病：19 年品种试验的荟萃分析

摘要 小麦是欧洲最常见的谷类作物，在欧洲大部分地区，产量限制最大的病害是由小麦酵母菌引起的小麦斑点病 (STB)。目前，该病害的控制取决于品种抗性和杀菌剂的大量投入。通过基于丹麦国家栽培品种测试的试验数据的荟萃分析，研究了使用优良栽培品种的混合物作为替代品的影响。栽培品种测试包括每年一次的四向栽培品种混合物，在这些试验中，1995 年至 2017 年间在多个地点监测了 STB 的严重程度和产量。 19 年的品种试验试验结果提供了 406 项试验的数据集，其中的影响的混合物进行了评估。荟萃分析显示，品种混合物使 STB 的严重程度降低了 10。6%，并在所有试验中提高了 1.4% 的产量。在未经治疗的试验中效果最大，其中 STB 严重程度降低了 17%，产量增加了 2.4%。这些混合物不仅表现优于纯林分种植的组成品种的平均水平，而且表现也优于给定年份中种植最多的四个品种的平均水平。未发现疾病压力或位置与混合物性能之间存在关系。栽培品种试验中包含的混合物并非设计用于控制 STB，因此结果被认为是混合物可达到的疾病控制的基线。品种混合物的使用与低投入农业系统相关，但也有助于集约化农业系统中的疾病控制。