Sensitivity of two isolates of Phakopsora pachyrhizi to dithiocarmamate, chloronitril, triazoles, strobilurins, and carboxamides fungicides

Juliatti, Fernando Cézar; Polloni, Lorraine Cristina; Prado, Tâmara Morais; Zacarias, Nadia Romina Shneider; Silva, Erick Araújo; Juliatti, Breno Cezar Marinho

doi:10.14393/bj-v33n4a2017-38357

Cited by 15 publications

(17 citation statements)

References 7 publications

(7 reference statements)

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“…Considering this scenario, several actions have been performed to monitor the resistance of P. pachyrhizi to new fungicides over time. Through experiments with Brazilian pathogen populations, Juliatti et al (2017) showed that multisite fungicides (chlorothalonil, copper oxychloride and mancozeb) can be used in the management of resistance to Asian soybean rust associated with strobilurins, triazoles and carboxamides. However, the risk of emergence of carboxamide resistant populations in Brazil by spores from neighboring countries has already been reported by Furlan et al (2018).…”

Section: Abstract Resumomentioning

confidence: 99%

Effect of adding fungicide to mixtures of triazoles and strobilurins in the control of downy mildew and Asian soybean rust

Zuntini

Alvarez

Theodoro

et al. 2019

Pesqui. Agropecu. Trop.

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Fungicides used to control the Asian soybean rust are composed almost entirely of mixtures involving the systemic (triazoles) and meso-systemic (strobilurins) modes of action. However, to control the soybean downy mildew, only protective fungicides are available. The present study aimed to evaluate the effectiveness of fungicides with different modes of action in the control of downy mildew and Asian soybean rust. A field experiment was carried out in a randomized block design, with seven treatments [negative control; difenoconazole at V7 + (azoxystrobin + cyproconazole) at R2 and R5.1; (tebuconazole + carbendazim) at V7 + (azoxystrobin + tebuconazole) at R2 and R5.1; carbendazim and mancozeb at V7 + (azoxystrobin + tebuconazole) at R2 and R5.1; (tebuconazole + carbendazim) at V7 + mancozeb in V7 + (azoxystrobin + tebuconazole) at R2 and R5.1; (tebuconazole + carbendazim) at V7 + (azoxystrobin + tebuconazole) at R2 and R5.1 + mancozeb at R2 and R5.1; (tebuconazole + carbendazim) at V7 + azoxystrobin + tebuconazole at R2 and R5.1 + mancozeb at R2 and R5.1 + carbendazim at R5.1] and four replicates. The following variables were evaluated: disease severity based on diagrammatic scales, phytotoxicity, product effectiveness, defoliation, number of pods per plant, number of seeds per pod, 1,000-seed weight and yield. The treatments with mancozeb addition showed to be more efficient in reducing the severity of mildew and Asian soybean rust and defoliation, providing increased seed yields for the crop. For the soybean downy mildew, the treatments with addition of mancozeb to benzimidazole, strobilurins and triazoles were more efficient in reducing the severity and for the control.

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Section: Abstract Resumomentioning

confidence: 99%

Effect of adding fungicide to mixtures of triazoles and strobilurins in the control of downy mildew and Asian soybean rust

Zuntini

Alvarez

Theodoro

et al. 2019

Pesqui. Agropecu. Trop.

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“…However, the fungicide trifloxystrobin was, in general, more effective in controlling the disease, as all the isolates had EC 50 values below 1.0 mg L -1 , with values ranging from 0.03 mg L -1 (Campos Novos-SC) to 0.63 mg L -1 (Condor-RS). JULIATTI et al (2017) reported concentrations lower than 0.007 mg L -1 in isolates obtained from Uberlândia-MG and Chapadão do Sul-MS.…”

Section: Resultsmentioning

confidence: 85%

“…XAVIER et al (2015) observed the EC 50 values between 0.000001 and 0.39 mg L -1 for isolates from eight Brazilian states. JULIATTI et al (2017) reported values between 0.0001 and 3.16 mg L -1 for isolates from Minas Gerais and Mato Grosso do Sul. In Brazilian areas cultivated with soybean, GODOY et al (2017) reported reduced sensitivity of P. pachyrhizi to prothioconazole.…”

Section: Resultsmentioning

confidence: 99%

“…SCHMITZ et al (2014) reported EC 50 value variations from 0.14 to 2.47 mg L -1 for the same active ingredient. JULIATTI et al (2017) reported that azoxystrobin-sensitive isolates had IC 50 values lower than 5.0 mg L -1 . In this study, all values of EC 50 , relative to the same molecule, were below 5.0 mg L -1 , except for the Sertão-RS isolate.…”

Section: Resultsmentioning

confidence: 99%

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In vivo sensitivity of Phakopsora pachyrhizi to fungicides

et al. 2020

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Asian soybean rust is one of the most destructive diseases that can be found in this crop. It can be largely controlled by fungicide application. The objective was to assess the sensitivity of P. pachyrhizi isolates to fungicides. The tests were performed in a completely randomized design, with six replicates. The sensitivity of twelve isolates to site-specific and multisite fungicides at concentrations of 0.1; 1.0; 10.0, and 100.0 mg L-1, plus a control with absence of fungicide (0.0 mg L-1) was assessed. Soybean leaflets were immersed in the appropriate fungicide solutions, disposed in wet chambers in plastic boxes, and inoculated using each uredinia suspension of P. pachyhrizi (5.0 x 104 uredospores mL-1), separately. Boxes were incubated for 20 days at a temperature of 23°C and a 12-hour photoperiod. Next, the number of uredinia per cm2 on the abaxial face of each leaflet was evaluated. The active ingredients prothioconazole, trifloxystrobin, fluxapiroxade, trifloxystrobin + prothioconazole, trifloxystrobin + bixafen + prothioconazole, azoxystrobin + benzovindiflupyr, and azoxystrobin + benzovindiflupyr + diphenoconazole were highly fungitoxic for the majority of the isolates, with EC50 lower than 1.0 mg L-1. Diphenoconazole, azoxystrobin, and fenpropimorph were considered moderately fungitoxic for nine of the twelve isolates, with EC50 between 1 and 10 mg L-1. The multisites mancozeb and copper oxychloride presented EC50 responses classified as low toxic for the twelve isolates and eight for chlorothalonil (EC50 between 10 mg L-1 and 50 mg L-1). Site-specific fungicides showed high-to-moderate fungitoxicity to P. pachyrhizi isolates, even as the multisites presented moderate-to-less toxic activity.

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“…Chemical pesticides have long been used in plant protection. However, they frequently increase production costs, negatively affect the environment, and are ineffective against resistant populations [9,10]. The search for eco-friendly efficient alternatives to control plant diseases is not a recent need.…”

Section: Situation Of Sclerotinia Stem Rot In Brazilmentioning

confidence: 99%

Trichodermaas a Biocontrol Agent againstSclerotiniaStem Rot or White Mold on Soybeans in Brazil: Usage and Technology

Juliatti¹,

Rezende²,

Juliatti³

et al. 2019

Trichoderma - The Most Widely Used Fungicide

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Biological control agents are alternatives to chemical pesticides in the management of plant diseases. Currently, hundreds of bioproducts are commercially available in international market varying mainly in antagonistic microorganisms and formulation. We screened four Trichoderma-based products as to their efficacy in controlling Sclerotinia stem rot (SSR) under protected and field environments and their effect on soybean seeds' sanity and physiological qualities. We also tested application technologies through seed microbiolization and foliar spraying to deliver the microorganisms, and their compatibility with chemical fungicides. In vitro assays showed that all Trichoderma strains were antagonistic to S. sclerotiorum evidencing hyperparasitic activity. Moreover, the bioproducts reduced fungi incidence on soybean seeds, promoted faster seedling emergence and did not hamper seeds' vigor. Increases of 14 and 37% were registered for root length and shoot fresh weight over that of the untreated control indicating potential application of the bioproducts as soybean growth promoters. Thiophanate-methyl and procymidone were the most compatible, without drastically affecting spore germination or mycelium growth. Under field conditions, all Trichoderma strains reduced SSR incidence and increased soybean grain yield. Formulation interferes on bioproducts' viability and efficacy deserving special attention upon development.

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Sensitivity of two isolates of Phakopsora pachyrhizi to dithiocarmamate, chloronitril, triazoles, strobilurins, and carboxamides fungicides

Cited by 15 publications

References 7 publications

Effect of adding fungicide to mixtures of triazoles and strobilurins in the control of downy mildew and Asian soybean rust

Effect of adding fungicide to mixtures of triazoles and strobilurins in the control of downy mildew and Asian soybean rust

In vivo sensitivity of Phakopsora pachyrhizi to fungicides

Trichodermaas a Biocontrol Agent againstSclerotiniaStem Rot or White Mold on Soybeans in Brazil: Usage and Technology

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