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The Influence of Water Quality on Efficacy of Fungicides for Turf Disease Control

机译：水质对杀菌剂控制草坪病效力的影响

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摘要

Fungicides are most often mixed with water and applied as a dilute spray for controlling diseases on golf course turf. Although published reports show that water quality can influence the performance of certain herbicides, evidence of similar effects on fungicide efficacy is weak and largely anecdotal. The objective of this research was to investigate the influence of water pH on efficacy of fungicides commonly used against dollar spot, a problematic disease on creeping bentgrass. In this study, three fungicides (metconazole, thiophanate-methyl, and iprodione) were mixed with water stabilized at three pH levels (pH= 5.0, 7.0, and 9.0) in in vitro and field experiments. Also considered was a time factor, i.e., the time between mixing and application where time T0 indicated fungicides were applied immediately after mixing, and time T24 indicated that fungicides were applied 24 hours after mixing. Results from field experiments revealed little or no difference in fungicide performance when mixed in acidic (pH=5.0), neutral (pH=7.0), and alkaline (pH=9.0) water. Also, the time factor was not significant for all fungicides and water pH levels. Results from in vitro work supported field observations---few differences in pathogen growth were observed for pH and time factors. Although tank mixing products to neutralize water pH may be important for other reasons, results reported here support the null hypothesis that the carrier water pH does not influence fungicide efficacy for control of dollar spot on creeping bentgrass.
机译：杀菌剂通常与水混合，以稀释喷雾剂的形式使用，以控制高尔夫球场草皮上的疾病。尽管已发表的报告表明水质会影响某些除草剂的性能，但对杀真菌剂功效产生类似影响的证据很少，而且大多是传闻的。这项研究的目的是研究水的pH值对常用的杀菌剂对美元斑的影响，而美元斑是一种对bent草有问题的疾病。在这项研究中，在体外和野外实验中，将三种杀菌剂（甲康唑，甲基托布津和异丙基酮）与稳定在三种pH值（pH = 5.0、7.0和9.0）的水混合。还考虑了时间因素，即混合和施用之间的时间，其中时间T0指示在混合后立即施用杀真菌剂，而时间T24指示在混合后24小时施用杀真菌剂。现场试验的结果表明，与酸性（pH = 5.0），中性（pH = 7.0）和碱性（pH = 9.0）的水混合时，杀菌性能几乎没有差异。而且，时间因素对于所有杀菌剂和水的pH值都不重要。体外研究的结果支持现场观察-在pH和时间因素方面几乎没有观察到病原体生长的差异。尽管出于其他原因，用桶混产品中和水的pH值可能很重要，但此处报道的结果支持了无效的假设，即载水的pH值不会影响杀菌剂控制bent草上美元斑的杀真菌剂功效。

著录项

  • 作者

    Stacy, Trevor R.;

  • 作者单位

    Purdue University.;

  • 授予单位 Purdue University.;
  • 学科 Plant pathology.
  • 学位 M.S.
  • 年度 2018
  • 页码 64 p.
  • 总页数 64
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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