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New data on pathotype distribution and mefenoxam tolerance of Plasmopara halstedii in Hungary

机译：关于匈牙利Plasmopara Halstedii的致病型分布和Mefenoxam耐受性的新数据

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Sunflower downy mildew (Plasmopara halstedii) is one of?the major diseases that?can be controlled by?using resistant cultivars and seed dressings; however, several isolates have developed tolerance to?some fungicides and the?resistance has?also been overcome by?new pathotypes. We aimed to?examine the?pathotype distribution in?Hungary and to?test the?pathotypes' mefenoxam sensitivity. The?isolates, which provided the?basis of?the research were collected from different regions of?Hungary between 2014 and 2017 and, later, their pathotypes were identified. According to?our results, pathotype 704 was?one of?the most widespread in?Hungary, but pathotype 730, pathotype 724 and pathotype 700 were also detected. Seven out of?ten isolates caused relatively high disease rates on the?mefenoxam-treated and inoculated sunflower plants with P. halstedii. The?pathogen has?a high genetic variability which enhances the?possibility to?develop fungicide resistance. Furthermore, this variability can easily contribute to?the breakdown of?the resistant genes of?the resistant hybrids. Both features can reduce the?effectiveness of?management; therefore, the?continuous monitoring of?this oomycete is very important.
机译：向日葵柔软的霉菌（Plasmopara halstedii）是其中之一？？可以通过耐药品种和种子敷料来控制吗？然而，几个分离物对耐杀菌剂具有耐受性，并且耐杀虫剂？也被克服了？新的病理型。我们的目标是？检查？匈牙利的病理型分布？测试？致病型梅芬毒性敏感性。 THE？分离，提供的是什么？基础？该研究是从2014年至2017年间匈牙利的不同地区收集的研究，后来，鉴定了他们的病理型。据我们的结果，病理型704是？其中一个？匈牙利最普遍的植物，但病理型730，病理型724和病理型700也被检测到。七个中的七分离株造成相对较高的疾病率，含有p. halstedii的甲苯肟治疗和接种向日葵植物。 ？病原体有什么高遗传变异，增强了？可能存在杀菌剂的可能性。此外，这种可变性很容易有助于？击穿？抗性杂种的抗性基因。这两个功能都可以减少？管理的有效性;因此，？连续监测？这个oomycete非常重要。

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