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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.
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.
A review of current knowledge of resistance aspects for the next-generation succinate dehydrogenase inhibitor fungicides.
The Fungicide Resistance Action Committee has developed resistance management recommendations for pathogens of different crops in order to reduce the risk for resistance development to this class of fungicides.
Cytochrome b gene sequence and structure of Pyrenophora teres and P. tritici-repentis and implications for QoI resistance.
Although different mutations may evolve in P. tritici-repentis, the G143A mutation will have the strongest impact on field performance of QoI fungicides.
Zymoseptoria tritici: A major threat to wheat production, integrated approaches to control.
Mode of resistance to respiration inhibitors at the cytochrome bc1 enzyme complex of Mycosphaerella fijiensis field isolates
In sensitive but not in resistant isolates, mixtures of Qo inhibitors and SHAM, an inhibitor of the alternative oxidase (AOX), were more active than the components alone, indicating that the alternative pathway is essential in metabolism, but not causal for resistance.
Fungicide modes of action and resistance in downy mildews
Among oomycetes, Plasmopara viticola on grape and Phytophthora infestans on potato are agronomically the most important pathogens requiring control measures to avoid crop losses. Several chemical…
QoI resistance emerged independently at least 4 times in European populations of Mycosphaerella graminicola.
This study demonstrated that recurring mutations independently introduced the QoI resistance allele into different genetic and geographic backgrounds and the resistant haplotypes then increased in frequency owing to the strong fungicide selection and spread eastward through wind dispersal of ascospores.
Recent developments in elucidating modes of resistance to phenylamide, DMI and strobilurin fungicides
Inheritance of resistance to carboxylic acid amide (CAA) fungicides in Plasmopara viticola
This is the first report on the inheritance of phenotypic traits in P. viticola, a new mandelic acid amide fungicide expressing high activity against foliar infecting oomycetes, including the grapevine downy mildew.