Phakopsora pachyrhizi in vitro sensitivity to fungicides

Blum, Marta Maria Casa; Reis, Erlei Melo

doi:10.1590/s0100-54052013000300015

Cited by 5 publications

(2 citation statements)

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“…Several methods have been described to measure the sensitivity of a fungus to a given fungicide, or to monitor its sensitivity reduction or loss, or even the fungitoxicity of a chemical (FRAC, 1991;RUSSEL, 2004;BLUM, 2009;BLUM;REIS, 2013;DEUNER;ZANATTA, 2015).…”

Section: Introductionmentioning

confidence: 99%

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

Juliatti¹,

Polloni²,

Prado³

et al. 2017

Biosci. J.

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Section: Introductionmentioning

confidence: 99%

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

Juliatti¹,

Polloni²,

Prado³

et al. 2017

Biosci. J.

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“…In a study conducted in Brazil, with a population of P. pachyrhizi collected in the 2004/5 season, the EC 50 value for azoxystrobin was 0.07 μg mL −1 and the author asserts that this value can be considered as the baseline (Blum & Reis, ). Although some research groups claim no loss of sensitivity to QoIs in the populations of P. pachyrhizi (Miles et al ., ; Scherm et al ., ; Schmitz et al ., ), higher values than the reference values have been found, including in this work, wherein the EC 50 value of the population was higher than 1 μg mL −1 in both systems and both seasons.…”

Section: Discussionmentioning

confidence: 99%

Fungicide sensitivity and monocyclic parameters related to the Phakopsora pachyrhizi–soybean pathosystem from organic and conventional soybean production systems

Klosowski

Castellar

Stammler³

et al. 2018

Plant Pathology

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The failure of chemical control of soybean rust has been related to the selection of less sensitive isolates, and the infection capacity of such isolates could have implications for the management of the disease. The aims of the present study were to compare the sensitivity to tebuconazole and azoxystrobin and the monocycle of soybean rust using isolates of Phakopsora pachyrhizi from two soybean fields with different production systems (organic and conventional) in 2012/13 and 2013/14 seasons, and to monitor mutations in the CYP51 gene. To assess the sensitivity to tebuconazole and azoxystrobin, detached leaf tests and in vitro germination, respectively, were used. To evaluate the monocycle, detached leaves were inoculated with a urediniospore suspension and evaluated daily by counting the number of uredia. The occurrence of the mutations in CYP51 was investigated by a pyrosequencing assay. In both 2012/13 and 2013/14 seasons, the EC 50 to tebuconazole was lower for the population from the organic system (0.41 and 0.10 lg mL À1 , respectively) compared to the conventional system (1.60 and 4.44 lg mL À1 , respectively), while the EC 50 to azoxystrobin was similar for both populations. The lower sensitivity to tebuconazole and azoxystrobin was associated with F120L + Y131H mutations in CYP51, and the F129L mutation in CYTB, respectively. The monomolecular model fitted to monocycle data and parameters related to the maximum asymptote and the AUDPC were superior for organic than the conventional system.

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Sensitivity of Phakopsora pachyrhizi Isolates to Fungicides and Reduction of Fungal Infection Based on Fungicide and Timing of Application

Twizeyimana

Hartman

2017

Plant Disease

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Soybean rust (SBR), caused by Phakopsora pachyrhizi, is a damaging foliar fungal disease in many soybean-growing areas of the world. Strategies to manage SBR include the use of foliar fungicides. Fungicide types, the rate of product application, and the number and timing of applications are critical components for successful rust management. The objectives of this study were to determine i) the sensitivity of P. pachyrhizi isolates collected in the U.S. to a range of fungicides and ii) the reduction of fungal infection based on fungicide type and timing of applications on soybean. There were differences (P < 0.05) in effective concentration (EC50) values among the fungicides tested. Azoxystrobin had low EC50 values for both urediniospore germination and fungal sporulation on inoculated leaflets. There were differences (P < 0.05) in fungal sporulation for application times, fungicide treatments, and their interaction when the fungus was inoculated on plants. All application times and nearly all fungicide treatments reduced (α = 0.05) fungal infection compared with the nonfungicide control. Information on fungicide sensitivity of P. pachyrhizi isolates and the preventive and curative effects of different fungicides are important in the management of SBR.

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Phakopsora pachyrhizi in vitro sensitivity to fungicides

Cited by 5 publications

References 0 publications

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

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

Fungicide sensitivity and monocyclic parameters related to the Phakopsora pachyrhizi–soybean pathosystem from organic and conventional soybean production systems

Sensitivity of Phakopsora pachyrhizi Isolates to Fungicides and Reduction of Fungal Infection Based on Fungicide and Timing of Application

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