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首页> 外文会议>International Conference of the British Crop Protection Council >Efficacy of single and two-way fungicide seed treatments for the control of metalaxyl-resistant strains of Plasmopara halstedii (sunflower downy mildew)
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Efficacy of single and two-way fungicide seed treatments for the control of metalaxyl-resistant strains of Plasmopara halstedii (sunflower downy mildew)

机译：单向杀菌剂种子治疗对吡吡吡氏菌（Sumflower Downy Mildew）控制金属增生菌株控制的疗效

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Control of the metalaxyl resistant strain of Plasmopara halstedii (causal agent of sunflower downy mildew) was studied in greenhouse and field experiments over a three-year period. Of 30 fungicides investigated, only azoxystrobin and fenamidone showed good efficacy as seed treatments for control of systemic symptoms initiated by root infection. Four fungicides displaying lesser disease control (ethaboxam, fluazinam, mancozeb, and zoximide) were tested as cofungicides with azoxystrobin and fenamidone. None of the fungicides, either used alone or in combination, gave complete control under natural or inoculated field conditions, in contrast to the total control previously experienced with metalaxyl. Disease incidence on all fungicide treatments increased from 1 wk to 7 wk after emergence, suggesting that the fungicide/rates tested were more fungistatic than fungicidal. Fenamidone was the most effective fungicide used singly, and fenamidone combined with either ethaboxam or zoximide was the most effective combination. Greenhouse tests of fungicide seed treatments were not effective at predicting field response of the best treatments, despite several modifications. The greenhouse tests, however, were satisfactory to identify ineffective fungicides.None of the three fungicides likely to be registered as sunflower seed treatments in the United States, namely azoxystrobin, fenamidone, and zoximide, displayed any potential phytotoxicity or seed safety concerns in preliminary laboratory and field emergence tests, intended to run for two years.
机译：在三年期间研究了温室和田间实验中研究了对疟原虫耐腐蚀性菌株（向日葵柔软霉菌的因果剂）的控制。研究了30个杀菌剂，只有氮杂氧杂菌素和芬太松只有良好的种子处理，用于控制通过根部感染引发的系统性症状。用偶氮素和苯胺酮测试呈现较小的疾病对照（ethaboxam，Fluazinam，Mancozeb和Zoximide）的杀菌剂进行了测试。与单独使用或组合使用的杀菌剂没有杀菌剂，其在天然或接种的场地条件下完全控制，相反，与先前与金属结构酮的总体对照相反。出现后，所有杀菌剂治疗的疾病发病率从1周增加到7周，表明测试的杀真菌剂/率比杀真菌剂更真实。芬太科是单独使用的最有效的杀真菌剂，芬太科与乙醛或紫红素酰亚胺相结合是最有效的组合。尽管有几种修改，但杀菌剂种子处理的温室试验在预测最佳治疗的场地响应时无效。然而，温室测试令人满意地识别无效的杀菌剂。这三种杀菌剂的NONE是在美国的葵花籽治疗中的三种杀菌剂，即氮杂氧杂环蛋白，芬太科和紫红素酰亚胺，在初步实验室展示了任何潜在的植物毒性或种子安全问题和现场出现测试，旨在运行两年。

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