Fire blight is a devastating disease of apple, pear and quince caused by the Gram-negative bacterium Erwinia amylovora. As antibiotics are not allowed against fire blight in Switzerland, optimization of alternative plant protection strategies is required. In this context, fire blight tolerant cultivars become of higher importance to control the disease. A plant protection product efficacy trial against fire blight with the susceptible cultivar ‘Gala Galaxy’ and the tolerant cultivar ‘Ladina’ bred at Agroscope was set up at the Agroscope Steinobstzentrum Breitenhof in 2018. Four different treatment strategies, including an untreated control, were tested on both cultivars after inoculation with Erwinia amylovora. ‘Ladina’ showed less fire blight blossom cluster infection in untreated and treated plants compared to ‘Gala Galaxy’. Blossom cluster infection rates following different plant protection treatments did not differ significantly from each other in ‘Gala Galaxy’ whereas they did in ‘Ladina’.

火疫病是由革兰氏阴性菌欧文氏菌引起的苹果、梨和木瓜的毁灭性病害。由于瑞士不允许使用抗生素对抗火疫病，因此需要优化替代植物保护策略。在这种情况下，耐火疫病品种对控制该病害变得更加重要。2018 年，在 Agroscope Steinobstzentrum Breitenhof 建立了一项针对火疫病的植物保护产品功效试验，其中包括在 Agroscope 培育的易感品种“Gala Galaxy”和耐受品种“Ladina”。测试了四种不同的处理策略，包括未处理的对照在接种梨火疫病菌后的两个品种上. 与“Gala Galaxy”相比，“Ladina”在未经处理和处理过的植物中表现出较少的火疫花簇感染。不同植物保护处理后的花簇感染率在'Gala Galaxy'中彼此没有显着差异，而在'Ladina'中却有显着差异。