Sensitivity variation and cross-resistance of Zymoseptoria tritici to azole fungicides in North America

Though delayed relative to Europe, fungicide resistance in Zymoseptoria tritici is now present in North America. We assessed azole fungicide sensitivity and cross-resistance in Zymoseptoria tritici isolates from the Willamette Valley of western Oregon, USA. Isolates were grown in the presence of 12...

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Bibliographic Details
Published in:European journal of plant pathology 2018-05, Vol.151 (1), p.269-274
Main Authors: Sykes, Emily M., Sackett, Kathryn E., Severns, Paul M., Mundt, Christopher C.
Format: Article
Language:English
Subjects:
Agriculture
Biomedical and Life Sciences
Correlation coefficient
Correlation coefficients
Cross-resistance
Dilution
Ecology
Fungicides
Life Sciences
Mathematical analysis
Pesticides
Plant Pathology
Plant Sciences
Propiconazole
Sensitivity analysis
Tebuconazole
Triazoles
Zymoseptoria tritici
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Summary:Though delayed relative to Europe, fungicide resistance in Zymoseptoria tritici is now present in North America. We assessed azole fungicide sensitivity and cross-resistance in Zymoseptoria tritici isolates from the Willamette Valley of western Oregon, USA. Isolates were grown in the presence of 12 serial dilutions of four different azole fungicides (cyproconazole, propiconazole, tebuconazole, and prothioconazole) and their EC 50 values calculated. Mean sensitivity of Z. tritici to the four fungicides differed by three orders of magnitude. Significant correlation coefficients ranging from to 0.42 to 0.75 were found among the three triazole fungicides (cyproconazole, propiconazole, and tebuconazole). Prothioconazole, a triazolinthione and more recently introduced fungicide in Oregon, showed evidence of weaker cross-resistance with the three triazoles ( r ranging from 0.26 to 0.42). Our results suggest that, in the early stages of fungicide evolution, growers may be able to conserve azole fungicides through conscientious and carefully selected fungicide applications and management practices.
ISSN:0929-1873
1573-8469
DOI:10.1007/s10658-017-1370-y