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首页> 外文期刊>Plant Protection Science >New data on pathotype distribution and mefenoxam tolerance of Plasmopara halstedii in Hungary
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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. 'Ihe 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：向日葵霜霉病（Plasmopara halstedii）是利用抗病品种和种衣剂可以控制的主要病害之一；然而，一些菌株对某些杀菌剂产生了耐受性，新的致病类型也克服了这种耐药性。我们的目的是检查匈牙利的病理类型分布，并测试病理类型“美芬诺康敏感性”2014年至2017年间，从匈牙利不同地区收集了作为研究基础的Ihe菌株，随后确定了其病理类型。根据我们的研究结果，704型是匈牙利分布最广的疾病之一，但也检测到730型、724型和700型。10个分离株中有7个在美芬诺康处理和接种了halstedii的向日葵植株上引起相对较高的发病率。该病原体具有很高的遗传变异性，这增加了产生抗药性的可能性。此外，这种变异很容易导致抗性杂交种的抗性基因崩溃。这两个特征都会降低管理的有效性；因此，对这种卵菌的持续监测非常重要。

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