Discriminatory dose determination for DMI fungicides for Clarireedia jacksonii and mycelial growth variation across active ingredients

IF 2 3区 农林科学 Q2 AGRONOMY
Crop Science Pub Date : 2024-12-12 DOI:10.1002/csc2.21418
M. M. Kahiu, J. E. Kaminski
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引用次数: 0

Abstract

In addition to cultural practices, dollar spot disease management requires frequent application of fungicides. Demethylation inhibitor (DMIs) fungicides are applied repeatedly to manage dollar spot in turfgrass systems. This facilitates reduction in DMI fungicide sensitivity among Clarireedia spp. populations. The objectives of this study were to (1) identify EC50 and relative mycelial growth (RMG) values for Clarireedia spp. across nine commercially available DMI fungicides, (2) determine the discriminatory dose for each of these fungicides, and (3) elucidate differences among isolates exhibiting varying degrees of sensitivity to propiconazole across all commercially available DMI fungicides. Discriminatory doses were determined to be 0.01 for propiconazole and prothioconazole, 0.1 for flutriafol and tebuconazole, and 1.0 µg active ingredient (a.i.) mL−1 potato dextrose agar for triadimefon, mefentrifluconazole, metconazole, triticonazole, and myclobutanil. Mefentrifluconazole completely inhibited mycelial growth of sensitive isolates. There were varying levels of mycelia suppression across highly insensitive isolates (RMG > 80%). Across highly insensitive isolates, prothioconazole provided the least suppression of growth, while mefentrifluconazole and myclobutanil provided the highest suppression of mycelial growth. However, none of the fungicides completely inhibited mycelial growth of the moderately sensitive and highly insensitive isolates. Results suggest variable suppression may exist among commercially available DMIs among sensitive and insensitive isolates of Clarireedia jacksonii.

Abstract Image

DMI杀菌剂对杰克逊Clarireedia的鉴别剂量测定及不同有效成分的菌丝生长变化
除了文化实践外,美元斑疹病管理需要经常使用杀菌剂。去甲基化抑制剂(DMIs)杀菌剂在草坪草系统中被反复应用来管理美元斑。这有助于降低克拉丽迪亚种群对DMI杀菌剂的敏感性。本研究的目的是:(1)确定9种市售DMI杀菌剂对Clarireedia sp .的EC50和相对菌丝生长(RMG)值,(2)确定每种杀菌剂的区分剂量,(3)阐明在所有市售DMI杀菌剂中对丙环唑表现出不同程度敏感性的分离株之间的差异。测定丙环康唑和原硫康唑的鉴别剂量为0.01,氟三酚和戊康唑的鉴别剂量为0.1,三嘧美丰、甲苯三氟康唑、甲康唑、三唑康唑和丁丁尼的鉴别剂量为1.0µg mL−1马铃薯葡萄糖琼脂。甲苯三氟康唑完全抑制敏感菌株菌丝生长。在高度不敏感的分离株中有不同程度的菌丝抑制(RMG >;80%)。在高度不敏感的分离株中,原硫康唑对生长的抑制作用最小,而甲苯三氟康唑和菌丁尼对菌丝生长的抑制作用最大。然而,没有一种杀菌剂能完全抑制中等敏感和高度不敏感菌株的菌丝生长。结果表明,市售DMIs对杰克逊Clarireedia敏感和不敏感菌株的抑制可能存在差异。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Crop Science
Crop Science 农林科学-农艺学
CiteScore
4.50
自引率
8.70%
发文量
197
审稿时长
3 months
期刊介绍: Articles in Crop Science are of interest to researchers, policy makers, educators, and practitioners. The scope of articles in Crop Science includes crop breeding and genetics; crop physiology and metabolism; crop ecology, production, and management; seed physiology, production, and technology; turfgrass science; forage and grazing land ecology and management; genomics, molecular genetics, and biotechnology; germplasm collections and their use; and biomedical, health beneficial, and nutritionally enhanced plants. Crop Science publishes thematic collections of articles across its scope and includes topical Review and Interpretation, and Perspectives articles.
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