Several old cultivars, and breeding clones of European pear Pyrus communis L. originating from Belgium, England, Sweden, and Switzerland were evaluated for their resistance/susceptibility to fire blight. Studies were carried out during three consecutive years 2007–2009 in the greenhouse of Warsaw University of Life Sciences, Poland. Strain 691 of Erwinia amylovora was used for artificial infection of plants. Genotypes included in this study considerably varied in their resistance to fire blight. The most resistant was the old English cultivar ‘Hessle’. The other two genotypes, i.e., ‘Gränna Rödpäron’ originating from Sweden, and Pyrus communis FG 1606 from Switzerland were included in a group of low susceptible ones. The most susceptible were Cra Py H 18, Cra Py V 22 and Cra Py W 14 from Belgium.

中文翻译：

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来自欧洲不同国家的梨基因型的抗白叶枯病性。

对来自比利时，英国，瑞典和瑞士的欧洲梨Pyrus communis L.的几个老品种和育种克隆进行了抗火疫病抗性/敏感性评估。研究是在2007年至2009年连续三年在波兰华沙生命科学大学的温室中进行的。淀粉欧文氏杆菌691株用于植物的人工感染。本研究中包括的基因型在抗火疫病方面有很大差异。抵抗力最强的是古老的英语品种“ Hessle”。其他两种基因型，即起源于瑞典的“GrännaRödpäron”和Pyrus communis来自瑞士的FG 1606包括在一组弱势人群中。最易感的是来自比利时的Cra Py H 18，Cra Py V 22和Cra Py W 14。