Caracterização da resistência a fungicidas em populações de fungos associados a lesões de Sigatokas em bananais do Vale do Ribeira (SP)

Malipensa, Julia

doi:10.31368/pgssaaa.2018.d.jm07

Cited by 2 publications

(12 citation statements)

References 14 publications

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“…It is noteworthy that these isolates represent a subset of the population sample investigated for QoI resistance by Oliveira et al [7]. At the initial location in Vale do Ribeira, São Paulo (SPVR-CI), the management approach relied on intensive fungicide spraying, involving 8 to 14 preventive applications per year for the chemical control of black Sigatoka [7,8]. This region is renowned as the primary hub for banana production in São Paulo state and across Brazil.…”

Section: Sampling Areamentioning

confidence: 99%

“…The leaf symptoms produced by the infections are mostly unique for each of the pathogen species within the SDC, except for M. thailandica. This particular species has been frequently recovered from typical black Sigatoka leaf streak lesions in Brazil [7,8]. However, some reports suggest instances of misdiagnosis, where black Sigatoka is confused with the less devastating yellow Sigatoka.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, the populations of the SDC pathogens are under strong selection pressure for the emergence of fungicide resistance [3,7,[24][25][26]. These systemic site-specific fungicides include the major groups of quinone outside inhibitors (QoIs), demethylation inhibitors (DMIs), and, more recently, succinate dehydrogenase inhibitors (SDHIs) [2,8,27]. Resistance to site-specific fungicides has been, in fact, a recurrent serious problem that limits the ability to control agricultural, medical, and veterinary fungal pathogens since these fungicides pose a risk for resistance to emerge, especially for pathogens with high evolutionary potential [28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

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Resistance to Site-Specific Succinate Dehydrogenase Inhibitor Fungicides Is Pervasive in Populations of Black and Yellow Sigatoka Pathogens in Banana Plantations from Southeastern Brazil

Silva,

Moreira,

de Souza

et al. 2024

Agronomy

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The Sigatoka disease complex (SDC), caused by Mycosphaerella fijiensis (Mf) and M. musicola (Mm), comprises the most destructive fungal leaf streak and spot diseases of commercial banana crops worldwide. In Brazil, the site-specific succinate dehydrogenase inhibitor (SDHI) fungicides labeled for SDC management since 2014 present a high risk for the emergence of resistance if deployed intensively and solo. Our study determined the levels of sensitivity to boscalid and fluxapyroxad in four populations of the SDC pathogens sampled in 2020 from three distinct geographical regions under contrasting fungicide programs. Resistance, defined as EC50 values exceeding 20 µg mL−1, was prevalent at 59.7% for fluxapyroxad and 94.0% for boscalid. Only 1.5% of isolates exhibited sensitivity to both fungicides. We also assessed the changes in the corresponding fungicide target protein-encoding genes (SdhB, C, and D). None of the target site alterations detected were associated with reduced sensitivity. A second SdhC paralog was also analyzed, but target alterations were not found. However, MDR (multidrug resistance) was detected in a selection of isolates. Further monitoring for Sdh target mutations will be important, but an important role for other resistance mechanisms such as the presence of additional Sdh paralogs and MDR cannot be ruled out. These results highlight the importance of implementing sound anti-resistance management strategies when SDHI fungicides are deployed for the management of SDC.

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Section: Sampling Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Resistance to Site-Specific Succinate Dehydrogenase Inhibitor Fungicides Is Pervasive in Populations of Black and Yellow Sigatoka Pathogens in Banana Plantations from Southeastern Brazil

Silva,

Moreira,

de Souza

et al. 2024

Agronomy

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“…& P. Syd. [1] can also cause leaf spot, as well as the newly described species M. thailandica Brazil [2]. Mycosphaerella eumusae Crous & X. Mourichon (Me) (syn.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, in the early 2000's, after only three years since the QoI azoxystrobin was labeled in Costa Rica, the intensive spraying of this fungicide on banana fields resulted in the early detection of resistance in Mf populations [27,28]. QoI-resistant populations of Sigatoka pathogens have been reported in Central and South America, Africa and Australia [15,25,26,29,30], while in Brazil there has been only a single report, from a dissertation, of a few QoI resistant strains [2].…”

Section: Introductionmentioning

confidence: 99%

Evidence of Resistance to QoI Fungicides in Contemporary Populations of Mycosphaerella fijiensis, M. musicola and M. thailandica from Banana Plantations in Southeastern Brazil

et al. 2022

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Yellow and black Sigatoka, caused by Mycosphaerella fijiensis and M. musicola, respectively, are the most important worldwide foliar diseases of bananas. Disease control is heavily dependent on intensive fungicide sprays, which increase selection pressure for fungicide resistance in pathogen populations. The primary objective of this study was to assess the level and spread of resistance to quinone-outside inhibitors (QoI—strobilurin) fungicides in populations of both pathogens sampled from banana fields under different fungicide spray regimes in Southeastern Brazil. Secondly, we aimed to investigate when QoI resistance was confirmed if this was associated with the target-site alteration G143A caused by a mutation in the mitochondrial encoded cytochrome b gene. QoI resistance was detected in fungicide treated banana fields, while no resistance was detected in the organic banana field. A total of 18.5% of the isolates sampled from the pathogens’ populations were resistant to QoI. The newly described M. thailandica was also found. It was the second most abundant Mycosphaerella species associated with Sigatoka-like leaf spot symptoms in the Ribeira Valley and the highest level of QoI resistance was found for this pathogen. The G143A cytochrome b alteration was associated with the resistance to the QoI fungicides azoxystrobin and trifloxystrobin in M. fijiensis, M. musicola and M. thailandica strains. In order to reduce resistance development and maintain the efficacy of QoI fungicides, anti-resistance management strategies based on integrated disease management practices should be implemented to control the Sigatoka disease complex.

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Caracterização da resistência a fungicidas em populações de fungos associados a lesões de Sigatokas em bananais do Vale do Ribeira (SP)

Cited by 2 publications

References 14 publications

Resistance to Site-Specific Succinate Dehydrogenase Inhibitor Fungicides Is Pervasive in Populations of Black and Yellow Sigatoka Pathogens in Banana Plantations from Southeastern Brazil

Resistance to Site-Specific Succinate Dehydrogenase Inhibitor Fungicides Is Pervasive in Populations of Black and Yellow Sigatoka Pathogens in Banana Plantations from Southeastern Brazil

Evidence of Resistance to QoI Fungicides in Contemporary Populations of Mycosphaerella fijiensis, M. musicola and M. thailandica from Banana Plantations in Southeastern Brazil

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