Occurrence of CAA Fungicide Resistance and Detection of G1105S Mutation in <i>Plasmopara viticola</i> Isolates From Vineyards in Sangli, Maharashtra, India

Sawant, Sanjay D.; Ghule, Mahesh R.; Sawant, Indu S.

doi:10.1094/pdis-05-16-0753-pdn

Cited by 15 publications

(12 citation statements)

References 3 publications

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“…Repeated applications of a fungicide with a single mode of action may result in the development of resistance to the compound by the pathogen, as has been reported regarding mefenoxam-resistant strains of basil downy mildew (Cohen et al, 2013b(Cohen et al, , 2017Pintore et al, 2016). Strains of other pathogens that are resistant to fungicides such as azoxystrobin and mandipropamid have been detected (Hagerty et al, 2017;Sawant et al, 2017), suggesting that basil downy mildew resistance to these fungicides may also develop from the exclusive and frequent use of these compounds against the pathogen. During the field experiment, some of the fungicide products used were composed of two fungicides with differing modes of action (e.g., ametoctradin + dimethomorph and zoxamide + mancozeb).…”

Section: Discussionmentioning

confidence: 85%

Evaluation of Selected Fungicide Application Regimes and Biotic Agents for the Management of Basil Downy Mildew

Zhang

Babadoost

Young

et al. 2018

hortte

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Basil downy mildew (Peronospora belbahrii) is a destructive disease that occurs in sweet basil (Ocimum basilicum). Foliar fungicide treatments could reduce infection and the severity of foliar symptoms over the course of the growing season. Multiple fungicides in variable combinations, application rates, and sequences were applied to basil foliage weekly over the course of a field season in Illinois (14 July to 8 Sept. 2014), and the treatment effects on basil downy mildew were evaluated three times. The evaluated treatments included mixtures and different rotations of azoxystrobin, potassium phosphite, mandipropamid, cyazofamid, oxathiapiprolin, experimental compound A18269SE, dimethomorph, zoxamide + mancozeb, fluazinam, fluopicolide, mefenoxam + copper hydroxide, fenamidone, mancozeb, and ametoctradin + dimethomorph. Potassium phosphite, which is known to be effective against other downy mildew pathogens, was included in combination with other fungicides or in fungicide application sequences. Disease severity was rated in fungicide-treated plots (0% to 20%) and compared with the control (73% to 80%) at each evaluation time. All fungicide treatments significantly reduced the area under the disease progress curve values compared with the untreated control. Adding a nonionic surfactant did not improve the efficacy of any of the chemical treatments evaluated for reducing downy mildew. Organic basil growers need novel, effective products to minimize damage from basil downy mildew. To aid organic basil growers, two novel, effective biocontrol agents were evaluated, Bacillus amyloliquefaciens AS 43.3 and Papiliotrema flavescens OH 182.9 3C (formerly Cryptococcus flavescens). Greenhouse experiments were conducted with the fungicides quinoxyfen and azoxystrobin serving as negative and positive fungicide treatment controls, respectively. Azoxystrobin reduced downy mildew according to the greenhouse tests, but neither quinoxyfen nor the biocontrol agents reduced downy mildew severity compared with the untreated control. This study identified 13 fungicide regimens that resulted in less than 10% basil downy mildew disease severity. More studies are needed to identify effective control products for basil downy mildew on organic basil.

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Section: Discussionmentioning

confidence: 85%

Evaluation of Selected Fungicide Application Regimes and Biotic Agents for the Management of Basil Downy Mildew

Zhang

Babadoost

Young

et al. 2018

hortte

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“…By the use of real-time PCR diagnostic technologies recently to monitor for QoI resistance proved capable to detect point mutations at frequencies within field populations as low as 1 in 10 8 . The frequent reports of failure of disease control and detection of resistance to carboxylic acid amide (CAA) fungicides in Plasmopara viticola from three vineyards in Sangli district of Maharashtra requires intensive efforts for monitoring and mitigating the problem for successful management of downy mildew in commercial vineyards (Sawant et al 2017).…”

Section: Detection and Measurement Of Fungicidal Resistancementioning

confidence: 99%

Dynamics of fungicidal resistance in the agro eco-system: A review

Valarmathi

2018

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The usage of fungicides to manage plant diseases in many crops is very significant. Reduced disease control with fungicides can result from several causes including application of insufficient quantity, low effectiveness of the fungicide on the target pathogen, improper timing or method of application and excessive rainfall. Resistance is the evolutionary response of a fungus to threat its survival by the fungicides. Fungicides with single site of action are more prone to develop resistance. The quicker development of resistance and the way to control its loss solely depends both on fungicide and the target fungus. The development of fungicide resistance is complex interactions of factors involving nature of fungicide and target pathogen. Thorough knowledge about the ecology of fungicide resistance pertaining to its development and its management is crucial for ensuring sustainable disease control with fungicides.

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“…Sensitivity monitoring is required as a consequence of the combined risks from the interaction of the individual components of resistance, such as fungicide risk, the polycyclic nature of the pathogen, sexual reproduction and the intensive application of the CAA fungicides in most vineyards. Currently, P. viticola strains resistant to CAAs have been detected in Japan, India and European countries including Italy and France . The CAA class was chosen in the present study because it is under strong selection pressure and the resistance mechanism is well established and has interesting features linked to the inheritance traits.…”

Section: Introductionmentioning

confidence: 99%

“…Currently, P. viticola strains resistant to CAAs have been detected in Japan, India and European countries including Italy and France. [20][21][22][23] The CAA class was chosen in the present study because it is under strong selection pressure and the resistance mechanism is well established and has interesting features linked to the inheritance traits. CAA fungicides inhibit cellulose biosynthesis 24 and the molecular mechanism of resistance relies on G1105S and G1105V mutations in the cellulose synthase PvCesA3 gene.…”

Section: Introductionmentioning

confidence: 99%

A time‐course investigation of resistance to the carboxylic acid amide mandipropamid in field populations of Plasmopara viticola treated with anti‐resistance strategies

Toffolatti

Russo

Campia

et al. 2018

Pest Management Science

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Occurrence of CAA Fungicide Resistance and Detection of G1105S Mutation in Plasmopara viticola Isolates From Vineyards in Sangli, Maharashtra, India

Cited by 15 publications

References 3 publications

Evaluation of Selected Fungicide Application Regimes and Biotic Agents for the Management of Basil Downy Mildew

Evaluation of Selected Fungicide Application Regimes and Biotic Agents for the Management of Basil Downy Mildew

Dynamics of fungicidal resistance in the agro eco-system: A review

A time‐course investigation of resistance to the carboxylic acid amide mandipropamid in field populations of Plasmopara viticola treated with anti‐resistance strategies

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