QoI resistance of Plasmopara viticola and Erysiphe necator in the mid-Atlantic United States.

@article{Baudoin2007QoIRO,
  title={QoI resistance of Plasmopara viticola and Erysiphe necator in the mid-Atlantic United States.},
  author={Anton B Baudoin and Gilberto Olaya and François Delmotte and Jeneylyne F. Colcol and Helge Sierotzki},
  journal={Plant Health Progress},
  year={2007},
  volume={9},
  pages={25}
}
Of 20 Plasmopara viticola isolates collected in four locations in Virginia and northwest North Carolina in 2005, 16 were resistant to QoI fungicides. The resistance factor was over 100, and label rates of formulated azoxystrobin and pyraclostrobin provided little or no control of these isolates. Additional sampling in 2006 revealed at least 15 additional vineyards with QoI-resistant P. viticola in Virginia, Maryland, and Pennsylvania. Of 22 isolates of Erysiphe (Uncinula) necator collected in… 
View via Publisher
apsjournals.apsnet.org
49 Citations
Highly Influential Citations
5
Background Citations
18
Methods Citations
8
Results Citations
2

Figures and Tables from this paper

49 Citations

Fungicide Sensitivity of Erysiphe necator and Plasmopara viticola from Virginia and nearby states

Most PM isolates exhibited reduced sensitivity to five DMI fungicides when compared to a sensitive subgroup and compared to published reports for unexposed populations; the resistance factor was highest for tebuconazole and myclobutanil.

Strobilurin (QoI) Resistance in Populations of Erysiphe necator on Grapes in Michigan.

Fungicide resistance may play a role in suboptimal control of powdery mildew observed in some Michigan vineyards and emphasizes the need for continued fungicide resistance management.

Diversity and fitness of Plasmopara viticola isolates resistant to QoI fungicides

The competitiveness of resistant isolates varied according to their fitness parameters, suggesting that there is no noticeable cost of QoI resistance in controlled conditions in Plasmopara viticola.

Monitoring of QoI fungicide resistance in Plasmopara viticola populations in Japan.

Monitoring the emergence, incidence and distribution of QoI fungicide resistance in P. viticola populations in Japan is necessary to improve pest management strategies for downy mildew disease in Japanese vineyards.

Efficacy of fungicide treatments for Plasmopara viticola control and occurrence of strobilurin field resistance in vineyards in Georgia, USA

Characterizing resistance of the grapevine powdery mildew Erysiphe necator to fungicides belonging to quinone outside inhibitors and demethylation inhibitors

DMI resistance was found to decline after years of subculturing, and the decline appeared to occur after a few culture transfers of field samples on fungicide-free host leaves, indicate instability of DMI resistance.

Fitness of Erysiphe necator with G143A-Based Resistance to Quinone Outside Inhibitors.

Competition assays were conducted on unsprayed grape plants by cycling mixtures of resistant and sensitive isolates characterized as genetically diverse based on microsatellite analyses, and %G143A, quantified by quantitative polymerase chain reaction (qPCR), increased significantly, indicating competitiveness of the resistant fraction.

Downy mildew resistance to QoI fungicides is rampant in Georgia vineyards

Georgia’s wine grape industry is relatively young and fragile. Though vinifera and hybrid vineyards have been in production in Georgia for approximately 40 years, the industry has only shown…

Observation on Baseline Sensitivity of Erysiphe necator Genetic Groups to Azoxystrobin

The higher sensitivity to azoxystrobin fungicides observed in isolate of genetic group B was significantly higher than in isolates of group A, to which all the isolates collected later in the season belonged, and can have important implications for powdery mildew control strategies.

Downy Mildew from Lake Erie Vineyards is Diverse for the G143A SNP Conferring Resistance to Quinone Outside Inhibitor Fungicides

The low prevalence of the resistant single nucleotide polymorphism (SNP) suggests that QoI fungicides should remain a viable control mechanism in Lake Erie vineyards, and it appears that a viticultural region where tolerant hosts predominant andQoI use is minimal, resistance buildup in the pathogen population will be minimal.

17 References

Observations on the behaviour of different populations of Plasmopara viticola resistant to Qol fungicides in Italian vineyards

QoI-resistant populations of P. viticola were found in all the vineyards sampled in 2001 and 2002 in Trentino Alto Adige and Friuli Venezia Giulia, where failure in QoI control was reported.

Distribution of Baseline Sensitivities to Azoxystrobin Among Isolates of Plasmopara viticola.

Differences in the intrinsic activities of the three strobilurin fungicides against this pathogen are indicated and can be utilized in future monitoring of P. viticola resistance to azoxystrobin.

At Least Two Origins of Fungicide Resistance in Grapevine Downy Mildew Populations

A high population structure was found when the frequency of QoI fungicide resistance haplotypes was assessed in 17 French vineyards, indicating that pathogen populations might be under strong directional selection for local adaptation to fungicide pressure.

Effect of dose rate and mixtures of fungicides on selection for QoI resistance in populations of Plasmopara viticola.

The results suggest that the choice of the fungicide partner and its dosage in the mixture can significantly affect the success of QoI resistance management strategies under practical conditions.

Mechanisms influencing the evolution of resistance to Qo inhibitor fungicides.

The G143A substitution is claimed not to affect the activity of the enzyme, suggesting that resistant individuals may not suffer from a significant fitness penalty, as was demonstrated in B graminis f sp tritici.

Sensitivity to Azoxystrobin Among Isolates of Uncinula necator: Baseline Distribution and Relationship to Myclobutanil Sensitivity.

The results of this study provide evidence of partial cross-sensitivity between azoxy Strobin and myclobutanil, and illustrate the potential selection for individuals with reduced sensitivity to azoxystrobin by postinfection application and reduced rates of this fungicide.

Recent developments in elucidating modes of resistance to phenylamide, DMI and strobilurin fungicides

Cytochrome b gene structure and consequences for resistance to Qo inhibitor fungicides in plant pathogens.

It is predicted that a nucleotide substitution in codon 143 would prevent splicing of the intron, leading to a deficient cytochrome b, which is lethal, and the evolution of resistance to QoI fungicides based on G143A is not likely to evolve in pathogens carrying an intron directly after this codon.

Study on QoI sensitivity of Plasmopara viticola causing grapevine downy mildew in North Carolina

  • (Abstr.) Phytopathology 97:S69
  • 2007

Practical resistance to QoI fungicides in New York populations of Uncinula necator associated with quantitative shifts in pathogen sensitivities. (Abstr.) Phytopathology 93:S90

  • 2003