First report of strobilurin resistance in <i>Cercospora beticola</i> in sugar beet (<i>Beta vulgaris</i>) in Michigan and Nebraska, USA

Kirk, W. W.; Hanson, Linda E.; Franc, G. D.; Stump, William L.; Gachango, Esther; Clark, Gregory M.; Ja, Stewart

doi:10.5197/j.2044-0588.2012.026.003

Cited by 33 publications

(11 citation statements)

References 8 publications

(6 reference statements)

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“…In this study, we discovered a G132A mutation in cytochrome b of T. urticae , equivalent to G143A in fungi, which has been reported as the most frequent mutation associated with strobilurin resistance . During a survey investigating the frequency of G132A in T. urticae field strains, we also uncovered for the first time the combination of G126S + A133T in T. urticae , reported previously in the spider mite P. citri .…”

Section: Introductionsupporting

confidence: 63%

“…[30][31][32] In this study, we discovered a G132A mutation in cytochrome b of T. urticae, equivalent to G143A in fungi, which has been reported as the most frequent mutation associated with strobilurin resistance. 30,[33][34][35][36] During a survey investigating the frequency of G132A in T. urticae field strains, we also uncovered for the first time the combination of G126S + A133T in T. urticae, reported previously in the spider mite P. citri. 24 We provide strong evidence of the causal role of these resistance mutations by revealing maternal inheritance and determine the strength of the phenotype by introgression of the mitochondrial haplotype in a susceptible genomic background.…”

Section: Introductionsupporting

confidence: 51%

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Identification and characterization of new mutations in mitochondrial cytochrome b that confer resistance to bifenazate and acequinocyl in the spider miteTetranychus urticae

Fotoukkiaii

Tan

Xue

et al. 2019

Pest Management Science

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BACKGROUND In spider mites, mutations in the mitochondrial cytochrome b Qo pocket have been reported to confer resistance to the Qo inhibitors bifenazate and acequinocyl. In this study, we surveyed populations of the two‐spotted spider mite Tetranychus urticae for mutations in cytochrome b, linked newly discovered mutations with resistance and assessed potential pleiotropic fitness costs. RESULTS We identified two novel mutations in the Qo site: G132A (equivalent to G143A in fungi resistant to strobilurins) and G126S + A133T (previously reported to cause bifenazate and acequinocyl resistance in Panonychus citri). Two T. urticae strains carrying G132A were highly resistant to bifenazate but not acequinocyl, whereas a strain with G126S + A133T displayed high levels of acequinocyl resistance, but only moderate levels of bifenazate resistance. Bifenazate and acequinocyl resistance were inherited maternally, providing strong evidence for the involvement of these mutations in the resistance phenotype. Near isogenic lines carrying G132A revealed several fitness penalties in T. urticae; a lower net reproductive rate (R0), intrinsic rate of increase (rm) and finite rate of increase (LM); a higher doubling time (DT); and a more male‐biased sex ratio. CONCLUSIONS Several lines of evidence were provided to support the causal role of newly discovered cytochrome b mutations in bifenazate and acequinocyl resistance. Because of the fitness costs associated with the G132A mutation, resistant T. urticae populations might be less competitive in a bifenazate‐free environment, offering opportunities for resistance management. © 2019 Society of Chemical Industry

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Section: Introductionsupporting

confidence: 63%

Section: Introductionsupporting

confidence: 51%

Identification and characterization of new mutations in mitochondrial cytochrome b that confer resistance to bifenazate and acequinocyl in the spider miteTetranychus urticae

Fotoukkiaii

Tan

Xue

et al. 2019

Pest Management Science

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“…Europe (Birla et al, 2012;Piszczek et al, 2018), Morocco (El Housni et al, 2018, Japan (Kayamori et al, 2020), Canada (Trueman et al, 2013), and the United States (Secor et al, 2010;Kirk et al, 2012) have indicated the rapid development of resistance to QoIs, which appears to be stable. In 2017, 89.1% of C. beticola isolates surveyed in the RRV region of the United States were resistant to the QoI pyraclostrobin and therefore its use is no longer recommended for CLS management in the region (Secor et al, 2017).…”

Section: Frac Group 11mentioning

confidence: 99%

Cercospora beticola: The intoxicating lifestyle of the leaf spot pathogen of sugar beet

Rangel

Spanner

Ebert

et al. 2020

Molecular Plant Pathology

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“…For example, 40% of the C. beticola population in New York was reported as resistant to the quinone outside inhibitor fungicide, azoxystrobin (Vaghefi et al, 2016). In the CLS-sugar beet pathosystem, reports of resistance to multiple fungicide modes of action restrict tactical control options for growers (e.g., Georgopoulos and Dovas, 1973;Giannopolitis, 1978;Kirk et al, 2012;Ruppel, 1975;Weiland and Halloin, 2001). A significant variation in CLS susceptibility between sugar beet cultivars has been identified enabling the use of resistant cultivars as a sentinel part of the integrated disease management strategy (Skaracis and Biancardi, 2000;Smith and Martin, 1978;Smith and Ruppel, 1974).…”

Section: Preliminary and Regional Reportsmentioning

confidence: 99%

Horticultural Characteristics and Susceptibility of Table Beet Cultivars to Cercospora Leaf Spot in New York

Pethybridge

Vaghefi

Kikkert

2017

hortte

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Table beet (Beta vulgaris ssp. vulgaris) production in New York is increasing for direct sale, use in value-added products, or processing. One of the most important diseases affecting table beet is cercospora leaf spot (CLS) caused by the fungus Cercospora beticola. CLS causes lesions on leaves that coalesce and leads to premature defoliation. The presence of CLS may cause buyer rejection at fresh markets. Defoliation from CLS may also result in crop loss because of the inability to harvest with top-pulling machinery. The susceptibility of popular table beet cultivars (Boldor, Detroit, Falcon, Merlin, Rhonda, Ruby Queen, and Touchstone Gold) to CLS was tested using C. beticola isolates representative of the New York population. Two trials were conducted by inoculating 6-week-old plants in the misting chamber. A small-plot replicated field trial was also conducted to examine horticultural characteristics of the cultivars. In the misting chamber trials, disease progress measured by the area under the disease progress stairs (AUDPS) was not significantly different between the red cultivars, Detroit and Ruby Queen, and was significantly higher in ‘Boldor’ than the other yellow cultivar Touchstone Gold. In the field trial, the number of CLS lesions per leaf at the final disease assessment and AUDPS were significantly lower in cultivar Ruby Queen than others and not significantly different between the yellow cultivars. The dry weight of roots was not significantly different among cultivars at first harvest (77 days after planting). At 112 days after planting, the dry weight of roots was significantly higher in cultivar Detroit than Rhonda and Boldor. Leaf blade length and the length:width ratio were cultivar-dependent, which may facilitate selection for specific fresh markets. Significant associations between canopy reflectance in the near infrared (IR) (830 nm), dry weight of foliage, and number of CLS lesions per leaf suggested that this technique may have utility for remote assessment of these variables in table beet research. Implications of these findings for the management of CLS in table beet are discussed.

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First report of strobilurin resistance in Cercospora beticola in sugar beet (Beta vulgaris) in Michigan and Nebraska, USA

Cited by 33 publications

References 8 publications

Identification and characterization of new mutations in mitochondrial cytochrome b that confer resistance to bifenazate and acequinocyl in the spider miteTetranychus urticae

Identification and characterization of new mutations in mitochondrial cytochrome b that confer resistance to bifenazate and acequinocyl in the spider miteTetranychus urticae

Cercospora beticola: The intoxicating lifestyle of the leaf spot pathogen of sugar beet

Horticultural Characteristics and Susceptibility of Table Beet Cultivars to Cercospora Leaf Spot in New York

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