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首页> 外文期刊>Plant Pathology >Identifying when it is financially beneficial to increase or decrease fungicide dose as resistance develops: An evaluation from long-term field experiments
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Identifying when it is financially beneficial to increase or decrease fungicide dose as resistance develops: An evaluation from long-term field experiments

机译：鉴定何时有利于增加或减少杀菌剂剂量的抵抗力发展：长期场实验的评估

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摘要

As the frequency of fungicide resistant strains increases in a pathogen population, there is a change in the shape of the response curve of disease severity to fungicide dose. We showed previously, in a theoretical analysis, that such changes can result in an increase or a decrease in the economically optimal dose of fungicide; this depends on how the response curve changes (which is determined jointly by the degree of insensitivity and frequency of a new strain) and the shape of the disease-yield loss relationship (which is a characteristic of the pathogen and crop). Here, we use field dose-response data to estimate economic optimum doses for the control of Zymoseptoria tritici on wheat over a 21-year period. Resistance to fungicide developed to varying degrees against three modes of action (MoA). Changes of optimal dose across years differed according to MoA, but there was an underlying pattern of initial increase in optimal dose, followed by a decrease (ultimately to zero dose at high levels of fungicide resistance). Fungicides are often applied in mixture and analysis shows that, provided the mixture partner is effective, the economic optimal dose increases less as resistance develops than when the fungicide is used as solo product; however, the subsequent decrease in optimal dose remains.
机译：随着杀菌剂抗性菌株的频率在病原体群体增加，疾病严重程度对杀菌剂量的响应曲线的形状变化。我们以前在一个理论分析中显示出这样的变化可能导致经济上最佳的杀菌剂的增加或减少;这取决于响应曲线如何变化（由新菌株的不敏感度和频率共同确定）和疾病 - 产量损失关系的形状（这是病原体和作物的特征）。在此，我们使用现场剂量 - 响应数据来估计在21年内对小麦对小麦进行唑经麦芽素的经济最佳剂量。对针对三种作用方式（MOA）产生的抗真菌剂的抗性。跨MOA的多年的最佳剂量的变化不同，但最佳剂量初始增加的潜在模式，然后减少（最终在杀菌剂抗性高水平的零剂量）。杀菌剂通常用于混合物中，分析表明，如果混合物伴侣是有效的，则经济最佳剂量随着耐杀真菌剂用作单独产品而产生的耐药性较小;然而，随后的最佳剂量减少仍然存在。

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