Control of cucumber downy mildew with novel fungicidal mixtures of Oxathiapiprolin

Plenaris (oxathiapiprolin) applied to sunflower seedlings was highly effective in controlling downy mildew incited by the oomycete Plasmopara halstedii. In vitro assays revealed strong suppression of zoospore release and cystospore germination of P.halstedii by Plenaris. Bion (acibenzolar-S-methyl) and Apron (mefenoxam) were partially effective when used singly, but performed synergistically when mixed with Plenaris. Seed treatment (coating) with Plenaris provided dose-dependent control of the disease whereas Bion and Apron provided partial or poor control. However, seeds treated with mixtures containing reduced rates of Plenaris and full rates of Bion and/or Apron provided complete control of the disease due to the synergistic interaction between these components. Such mixtures should be used for seed treatment in the field to minimize selection pressure imposed on the pathogen.

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“…We found similar synergy between oxathiapiprolin and MFX in the control of late blight in tomato [27] and downy mildew in cucumber [28].…”

Section: Discussionmentioning

confidence: 92%

“…Oxathiapiprolin mixtures (with azoxystrobin, mandipropamid or mefenoxam) were reported to be highly effective against Phytophthora infestans in tomato [27] and Pseudoperonospora cubensis in cucumber [28]. Interestingly, the mixture of OXPT+mefenoxam was also effective against a mefenoxam-resistant isolates of these pathogens.…”

Section: Introductionmentioning

confidence: 99%

Novel synergistic fungicidal mixtures of oxathiapiprolin protect sunflower seeds from downy mildew caused by Plasmopara halstedii

2019

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“…Our data showed that ZE is a synergistic mixture, namely it provides a significant better disease control than the combined control efficacies of its two components [ 5 , 6 ]. OXPT was proved to act synergistically with mefenoxam in controlling P .…”

Section: Discussionmentioning

confidence: 99%

“…Curatively, it stops mycelial growth, inhibits lesion expansion and inhibits spore production. It shows translaminar and acropetally systemic movements [2][3][4][5][6]. Oxathiapiprolin is highly effective when applied to the foliage [2] the root system [3] or the seeds [4].…”

Section: Introductionmentioning

confidence: 99%

A new strategy for durable control of late blight in potato by a single soil application of an oxathiapiprolin mixture in early season

Cohen

Rubin

2020

PLoS ONE

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Root treatment with oxathiapiprolin, benthiavalicarb or their mixture Zorvec-Endavia [ZE (3+7, w/w)] was shown to provide prolonged systemic protection against foliar oomycete pathogens attacking cucumber, tomato and basil. Here we report that these fungicides can effectively protect potato plants against late blight when applied to the soil in which such potato plants are grown. In two field experiments, performed in 2019 and 2020, potato plants grown in 64 L containers were treated with a soil drench of oxathiapiprolin, benthiavalicarb or ZE at 12.5, 25 or 50 mg ai/five plants in a container. Artificial inoculations with Phytophthora infestans revealed that such treated plants were protected against late blight in a dose-dependent manner all along the season. Interestingly, oxathiapiprolin persisted in the treated soil for at least 139 days, providing systemic protection against late blight to the following potato crops grown in that treated soils. Potato plants grown in loess soil in the field were either sprayed or drenched with ZE. Plants treated via the soil were significantly better protected against late blight compared to the plants treated by a spray. The data demonstrate a new strategy for season-long protection of potato against late blight by a single soil application of ZE. The systemic nature of oxathiapiprolin and benthiavalicarb composing ZE assures the translocation to the foliage of two fungicides with different modes of action. This shall minimize the risk of developing resistance against either fungicide in the treated crops.

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“…However, the frequent appearance of insensitive isolates to the current chemistries rendered them ineffective. The novel fungicide oxathiapiprolin that targets oxysterol binding proteins provides a relief due to its excellent systemic activity against DM in cucumber [9,10].…”

Section: Introductionmentioning

confidence: 99%

Isolate-Dependent Inheritance of Resistance Against Pseudoperonospora cubensis in Cucumber

et al. 2020

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Six wild accessions of Cucumis sativum were evaluated for resistance against each of the 23 isolates of the downy mildew oomycete Pseudoperonospora cubensis. The isolates originated from Israel, Europe, USA, and Asia. C. sativum PI 197088 (India) and PI 330628 (Pakistan) exhibited the highest level of resistance against multiple isolates of P. cubensis. Resistance was manifested as reduced lesion number, lesion size, sporangiophores and sporangia per lesion and enhanced encasement of haustoria with callose and intensive accumulation of lignin in lesions of both Plant Introductions (PIs) compared to the susceptible C. sativum SMR-18. In the field, much smaller AUDPC (Area Under Disease Progress Curve) values were recorded in PI 197088 or PI 330628 as compared to SMR-18. Each PI was crossed with SMR-18 and offspring progeny plants were exposed to inoculation with each of several isolates of P. cubensis in growth chambers and the field during six growing seasons. F1 plants showed partial resistance. F2 plants showed multiple phenotypes ranging from highly susceptible (S) to highly resistant (R, no symptoms) including moderately resistant (MR) phenotypes. The segregation ratio between phenotypes in growth chambers ranged from 3:1 to 1:15, depending on the isolate used for inoculation, suggesting that the number of genes, dominant, partially dominant, or recessive are responsible for resistance. In the field, the segregation ratio of 1:15, 1:14:1, or 1:9:6 was observed. F2 progeny plants of the cross between the two resistant PI’s were resistant, except for a few plants that were partially susceptible, suggesting that some of the resistance genes in PI 197088 and PI 330328 are not allelic.

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Control of cucumber downy mildew with novel fungicidal mixtures of Oxathiapiprolin

Cited by 12 publications

References 14 publications

Novel synergistic fungicidal mixtures of oxathiapiprolin protect sunflower seeds from downy mildew caused by Plasmopara halstedii

Novel synergistic fungicidal mixtures of oxathiapiprolin protect sunflower seeds from downy mildew caused by Plasmopara halstedii

A new strategy for durable control of late blight in potato by a single soil application of an oxathiapiprolin mixture in early season

Isolate-Dependent Inheritance of Resistance Against Pseudoperonospora cubensis in Cucumber

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