Abstract
Summary The results of the growth inhibition level of isolates culturing on PDA (Potato Dextrose Agar) medium containing prochloraz, cyproconazole, epoxiconazole, flusilazole, tebuconazole and tetraconazole at various concentrations were used in the studies of Cercospora beticola cross resistance to triazole (demethylation inhibitors – DMI) fungicides. Spearman correlation matrix was determined for all active substances and illustrated by heat maps, and followed by cluster analysis. Between the ranks of correlation coefficients of the individual active substances a trend emerged indicating the similarity between some of them and, associated with the risk of resistance development. The greatest risk of cross resistance forming was identified for the following groups: cyproconazole and tetraconazole; tebuconazole, flusilazole and epoxiconazole. The statistical analysis indicated also the possibility of using prochloraz for control of C. beticola strains with decreasing sensitivity or resistant to triazoles.
Highlights
The results of the growth inhibition level of isolates culturing on PDA (Potato Dextrose Agar) medium containing prochloraz, cyproconazole, epoxiconazole, flusilazole, tebuconazole and tetraconazole at various concentrations were used in the studies of Cercospora beticola cross resistance to triazole fungicides
Spearman correlation matrix was determined for all active substances and illustrated by heat maps, and followed by cluster analysis
The greatest risk of cross resistance forming was identified for the following groups: cyproconazole and tetraconazole; tebuconazole, flusilazole and epoxiconazole
Summary
The results of the growth inhibition level of isolates culturing on PDA (Potato Dextrose Agar) medium containing prochloraz, cyproconazole, epoxiconazole, flusilazole, tebuconazole and tetraconazole at various concentrations were used in the studies of Cercospora beticola cross resistance to triazole (demethylation inhibitors – DMI) fungicides. Streszczenie W badaniach odporności krzyżowej izolatów Cercospora beticola na fungicydy triazolowe (demethylation inhibitors – DMI). Na podstawie badań laboratoryjnych szacuje się, że w roku 2012 liczba izolatów C. beticola o obniżonej wrażliwości na triazole w zależności od stosowanej substancji czynnej oraz miejsca pochodzenia wynosiła od 0 do 30% (Pieczul i Perek 2013). U izolatów grzybów, które nabyły odporność na substancje czynne z grupy triazoli często obserwowane jest zjawisko odporności krzyżowej. Celem badań była ocena ryzyka powstawania odporności krzyżowej u izolatów C. beticola na różne substancje czynne z grupy triazoli
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