Comparison of quinone outside inhibitor fungicide-resistant and -sensitive isolates of Cercospora sojina

Zhang, Guirong; Bradley, Carl A.

doi:10.1016/j.cropro.2016.12.007

Cited by 12 publications

(6 citation statements)

References 32 publications

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“…It is also important to note that not all counties and parishes in these and other states have been surveyed for QoI fungicide-resistant C. sojina isolates. QoI fungicideresistant isolates likely will persist in these areas, because no fitness costs associated with the G143A mutation have been previously reported in C. sojina (Zhang and Bradley 2017).…”

Section: Discussionmentioning

confidence: 99%

“…In light of the widespread occurrence of QoI fungicide-resistant C. sojina isolates, management of frogeye leaf spot may become more complex. Zhang and Bradley (2017) reported that, compared with sensitive isolates, QoI fungicide-resistant C. sojina isolates were more aggressive in causing frogeye leaf spot on soybean within the first 8 days after inoculation in the greenhouse. An integrated management approach that includes planting frogeye leaf spot-resistant soybean cultivars, rotating soybean with nonhost crops, and tilling to help increase decomposition of soybean residue may be required to reduce frogeye leaf spot severity below economically damaging levels.…”

Section: Discussionmentioning

confidence: 99%

“…Conidia that germinated on these discriminatory doses of these fungicides were considered to be resistant to QoI fungicides. For each assay conducted, known QoI fungicide-resistant (isolate CS 1036, from Lauderdale County, TN [Zhang and Bradley 2017;Zhang et al 2012a]) and fungicide-sensitive (isolate S9, from Georgia [Zhang et al 2012b]) C. sojina isolates were included as internal controls.…”

Section: Figurementioning

confidence: 99%

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Widespread Occurrence of Quinone Outside Inhibitor Fungicide-Resistant Isolates of Cercospora sojina, Causal Agent of Frogeye Leaf Spot of Soybean, in the United States

Zhang

Allen

Bond³

et al. 2018

Plant Health Progress

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Isolates of Cercospora sojina, causal agent of frogeye leaf spot of soybean (Glycine max), were collected across Alabama, Arkansas, Delaware, Illinois, Indiana, Iowa, Kentucky, Louisiana, Mississippi, Missouri, North Carolina, Ohio, Tennessee, and Virginia and were evaluated for quinone outside inhibitor (QoI) fungicide resistance. Collection of these isolates from these 14 states occurred between 2010 and 2017. QoI fungicide-resistant C. sojina isolates were detected in all 14 states surveyed and represent a total of 240 counties or parishes. In 2017, these 240 counties and parishes represented approximately 13% of the harvested soybean hectares in the United States. In light of this widespread occurrence of QoI fungicide-resistant C. sojina isolates, management of frogeye leaf spot should focus on integrated management practices such as planting resistant soybean cultivars, rotating with nonhost crops, and tilling to speed up decomposition of infested soybean residue. When foliar fungicide application is warranted, fungicide products that contain active ingredients from chemistry classes other than the QoI class should be applied for frogeye leaf spot management.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

See 1 more Smart Citation

Widespread Occurrence of Quinone Outside Inhibitor Fungicide-Resistant Isolates of Cercospora sojina, Causal Agent of Frogeye Leaf Spot of Soybean, in the United States

Zhang

Allen

Bond³

et al. 2018

Plant Health Progress

Self Cite

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“…Cercospora sojina is a sexually recombining pathogen, capable of producing heterozygous spores which influences the genetic variability of the pathogen (Zhang and Bradley 2017). According to Bradley et al (2012) (Wrather et al 2010;Zeng et al 2015).…”

Section: Pathogen Characteristics and Life Cyclementioning

confidence: 99%

“…An isolate was considered resistant to azoxystrobin when size of the mycelium was greater than or equal to 5%, as the 5mmx5mm pure culture plug accounted for 5% of the area of the 60mm X 10mm plate. Each isolate tested as QoI-resistant in the fungicide sensitivity bioassay was submitted to sporulation and radial growth tests following the protocol of Zhang and Bradley (2017). In preparation for these tests, spores were collected by adding 15µL of sterile water to the mycelium of a pure culture plate and recovering the same volume of water from the plate via pipet.…”

Section: Fungicide Sensitivity Bioassaymentioning

confidence: 99%

Assessing Missouri soybean fields for azoxystrobin resistant cercospora sojina

MacGregor¹

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Successful management of Cercospora sojina, the causal agent of frogeye leaf spot, can be achieved through utilizing resistant varieties and fungicide applications. Fungicides in the quinone outside inhibitor (QoI) class are most effective in controlling C. sojina in the field. Unfortunately, azoxystrobin fungicide-resistant isolates of C. sojina have been recovered in many soybean growing areas of the U.S. Fungicide-resistant isolates of C. sojina were first detected in 2011 and 2012 in two counties in southeast Missouri, but no further assessment was conducted. In this study, 121 isolates were collected from 15 surveyed counties between 2019 and 2020 in an effort to understand the geographical distribution of fungicide-resistant C. sojina. Isolates were collected from fields based on the presence of frogeye leaf spot symptoms. Samples were brought to the laboratory and isolates were recovered from individual lesions. A fungicide sensitivity bioassay was conducted to determine which isolates were resistant to the QoI class of fungicides. The fungicide sensitivity bioassay consisted of full-strength PDA amended with technical grade azoxystrobin at five different concentrations and a no fungicide control. Out of 121 isolates, 81 were fungicide-resistant representing 13 of the 15 Missouri counties included in the survey. Notably, the northwest corner of Missouri had the highest concentration of fungicide-resistant isolates, consistent with the recent recovery of fungicide-resistant C. sojina isolates in Iowa and Nebraska. The widespread recovery of fungicide-resistant C. sojina in multiple counties throughout Missouri provides new insight into disease management in the state.

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Induction of direct somatic embryogenesis and shoot organogenesis and histological study in tree peony (Paeonia sect. Moutan)

Cheng

Zhong

2020

Plant Cell Tiss Organ Cult

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Comparison of quinone outside inhibitor fungicide-resistant and -sensitive isolates of Cercospora sojina

Cited by 12 publications

References 32 publications

Widespread Occurrence of Quinone Outside Inhibitor Fungicide-Resistant Isolates of Cercospora sojina, Causal Agent of Frogeye Leaf Spot of Soybean, in the United States

Widespread Occurrence of Quinone Outside Inhibitor Fungicide-Resistant Isolates of Cercospora sojina, Causal Agent of Frogeye Leaf Spot of Soybean, in the United States

Assessing Missouri soybean fields for azoxystrobin resistant cercospora sojina

Induction of direct somatic embryogenesis and shoot organogenesis and histological study in tree peony (Paeonia sect. Moutan)

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