立方假丝孢1和2分支对霜霉病菌的同源性和差异性反应

IF 1.7 Q2 PLANT SCIENCES

Plant Health Progress Pub Date : 2023-04-05 DOI:10.1094/php-01-23-0007-sc

A. Keinath

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引用次数: 0

摘要

杀菌剂是葫芦霜霉病最常见、最重要的防治技术。已在暴露于天然接种物的盆栽黄瓜幼苗上监测了杀菌剂对致病因子——一种专性生物型假peronospora cubensis的效力。本研究的目的是比较9种杀菌剂对黄瓜（Cucumis sativus）对抗古巴毕赤酵母（P.cubensis）第2分支的效力，以及它们对主要感染第1分支的寄主毛茛南瓜（Cucurbita moschata）和西瓜（Citrullus lanatus）的效力。2019年10月和2020年10月，在美国南卡罗来纳州查尔斯顿对所有三个宿主进行了生物测定，2018年7月对白脱南瓜进行了生物检测。在分支2分离株中（18次中的7次）比分支1分离株（43次中的12次）更频繁地检测到cymoxanil（Curzate）、嘧菌酯（Quadris）、dimethomorp（Forum）、曼地丙酰胺（Revus）或propamocarb（Previcur-Flex）缺乏疗效，确定为相对疾病严重程度与水控制没有显著差异，通常≥50%。在所有宿主上超过一半的生物测定中，环磷酰胺、嘧菌酯和二甲吗啉无效。Mandipropamid在两次黄瓜生物测定中仅对Clade 2无效，而propamocarb在分别对白脱南瓜和西瓜进行的三次生物测定中的两次和两次生物测定之一中仅对Clade 1无效。在所有七种生物测定中，乙胺（Elumin）有效至中等有效，cyazofamid（Ranman）、氟阿齐南（Omega）和氟皮内酯（Presidio）有效。

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Congruent and Differential Responses of Pseudoperonospora cubensis Clades 1 and 2 to Downy Mildew Fungicides

Fungicides are the most common and important management technique for cucurbit downy mildew. Fungicide efficacy against the causal agent, Pseudoperonospora cubensis, an obligate biotroph, has been monitored on potted cucumber seedlings exposed to natural inoculum. The objective of this study was to compare efficacy of nine fungicides on cucumber (Cucumis sativus) against Clade 2 of P. cubensis with their efficacy on butternut squash (Cucurbita moschata) and watermelon (Citrullus lanatus), hosts primarily infected by Clade 1. Bioassays were done in Charleston, SC, USA, with all three hosts in October 2019 and 2020 and with butternut squash in July 2018. Lack of efficacy, determined as relative disease severity not significantly different from the water control, typically ≥ 50%, was detected with cymoxanil (Curzate), azoxystrobin (Quadris), dimethomorph (Forum), mandipropamid (Revus), or propamocarb (Previcur Flex) more frequently in Clade 2 isolates (7 of 18 times) than in Clade 1 isolates (12 of 43 times). Cymoxanil, azoxystrobin, and dimethomorph were ineffective in over half of the bioassays on all hosts. Mandipropamid was ineffective only against Clade 2 in both cucumber assays, while propamocarb was ineffective only against Clade 1 in two of three and one of two bioassays on butternut squash and watermelon, respectively. In all seven bioassays ethaboxam (Elumin) was effective to moderately effective, and cyazofamid (Ranman), fluazinam (Omega), and fluopicolide (Presidio) were effective.

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来源期刊

Plant Health Progress Agricultural and Biological Sciences-Horticulture

CiteScore

3.00

自引率

13.00%

发文量

期刊介绍： Plant Health Progress, a member journal of the Plant Management Network, is a multidisciplinary science-based journal covering all aspects of applied plant health management in agriculture and horticulture. Both peer-reviewed and fully citable, the journal is a credible online-only publication. Plant Health Progress is a not-for-profit collaborative endeavor of the plant health community at large, serving practitioners worldwide. Its primary goal is to provide a comprehensive one-stop Internet resource for plant health information.