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.
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机译：对来自比利时，英国，瑞典和瑞士的欧洲梨Pyrus communis L.的几个老品种和繁殖克隆进行了抗火疫病抗性/敏感性评估。研究在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。支链淀粉欧文氏菌691株用于植物的人工感染。这项研究中包括的基因型对火疫病的抵抗力差异很大。抵抗力最强的是古老的英语品种“海斯尔”。其他两个基因型，即来自瑞典的“GrännaRödpäron”和来自瑞士的Pyrus communis FG 1606，被归入一组弱势人群。最易感的是来自比利时的Cra Py H 18，Cra Py V 22和Cra Py W 14。
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