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首页> 外文期刊>Mycologia >Sensitivity of Texas strains of Ceratocystis fagacearum to triazole fungicides.
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Sensitivity of Texas strains of Ceratocystis fagacearum to triazole fungicides.

机译：德州Ceratocystis fagacearum菌株对三唑类杀菌剂的敏感性。

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摘要

Ten geographically diverse Texas strains of the oak wilt fungus C. fagacearum were tested in vitro for their sensitivity to 5 triazole fungicides based on accumulated linear growth, linear growth rates and DW accumulation in response to fungicide concn of 0.1-600 p.p.b. None of the triazoles inhibited growth at 0.1 p.p.b., but 4 of the 5 fungicides were highly effective in totally inhibiting growth on homemade potato dextrose agar medium and in neopeptone broth cultures at min. effective concn (MECs) in the 10-200 p.p.b. range. Triadimefon did not prevent growth at concn up to 1100 p.p.b. The sensitivity of Texas strains to the triazoles was up to tenfold higher in aqueous broth culture than on solid medium. Exceptional strains exhibited toleranceof certain triazoles, requiring MECs up to 500 p.p.b. or higher for total growth inhibition. The specific activity of individual triazoles was related to substituent R-groups attached to chiral carbons. The ketal triazoles, propiconazole and difenoconazole with the dioxolane ring, had the greatest effect on growth rates of the Texas strains. Myclobutanil with nitrilo and butyl R-groups and tebuconazole with dimethylethyl and hydroxyl R-groups had intermediate effects on growth rates, while triadimefonwith a dimethyl butanone group had the least effect on growth rates of the fungus. Triazole sensitivity was not linked to specific mating incompatibility alleles. The triazole sensitivity of Texas strains of C. fagacearum was much greater than the sensitivity of many other phytopathogenic fungi previously tested. The significance of the results relative to current fungicide application methods used for oak wilt control by the Texas Oak Wilt Suppression Project (TOWSP) are discussed.
机译：根据累积的线性增长，线性生长速率和DW积累，响应0.1-600 p.p.b.的杀菌剂浓度，在体外测试了十个地理分布不同的德克萨斯州橡树野生真菌C.fagacearum菌株对5种三唑杀菌剂的敏感性。三唑均没有在0.1 p.p.b.时抑制生长，但是5种杀菌剂中有4种在完全抑制自制马铃薯右旋糖琼脂培养基和新pe培养液中的生长方面非常有效。有效浓度（MEC）在10-200 p.p.b.范围。 Triadimefon并没有阻止1100 p.p.b.的生长。在水性肉汤培养中，德州菌株对三唑的敏感性比在固体培养基上高三倍。优异的菌株表现出对某些三唑的耐受性，需要高达500 p.p.b的MEC。或更高，以抑制总生长。各个三唑的比活性与连接到手性碳上的取代基R-基有关。带有二氧戊环的缩酮三唑，丙环唑和二苯并康唑对德州菌株的生长速度影响最大。带有次氮基和丁基R基团的杀虫丁对真菌的生长速率具有中等影响，而带有二甲基丁酮基的三唑酮对真菌的生长速率影响最小。三唑的敏感性与特定的交配不相容等位基因无关。 Texas C. fagacearum菌株的三唑敏感性比以前测试的许多其他植物病原真菌的敏感性高得多。讨论了相对于德克萨斯州橡木枯萎抑制项目（TOWSP）用于控制橡树枯萎病的当前杀菌剂施用方法，结果的意义。

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