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Sensitivity of Z ymoseptoria tritici Isolates from Tunisia to Pyraclostrobin, Fluxapyroxad, Epoxiconazole, Metconazole, Prochloraz and Tebuconazole
Author(s) -
Taher Karima,
Graf Sarah,
Fakhfakh Mohamed Moez,
Salah Halim B. H.,
Yahyaoui Amor,
Rezgui Salah,
Nasraoui Bouzid,
Stammler Gerd
Publication year - 2014
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/jph.12210
Subject(s) - tebuconazole , biology , sensitivity (control systems) , population , microbiology and biotechnology , horticulture , fungicide , demography , sociology , electronic engineering , engineering
Sensitivity of 159 isolates of Z ymoseptoria tritici collected from durum wheat fields in Tunisia in 2012 was analysed towards pyraclostrobin, fluxapyroxad, epoxiconazole, metconazole, prochloraz and tebuconazole using microtiter tests. All isolates were found to be highly sensitive to pyraclostrobin with EC 50 <0.01 mg/l with the exception of three isolates from the same field with higher EC 50 values (>0.5 mg/l). These three isolates carried a mutation in the cytochrome b gene encoding the G143A substitution. This is the first report of quinone outside inhibitors (QoI) resistance in Z. tritici in Tunisia. Sensitivity towards r fluxapyroxad was in a narrow range with EC 50 values ranging between 0.013 and 0.125 mg/l, which can serve as baseline sensitivity data for the future. Demethylation inhibitors sensitivity varied across a broad range with the data indicating a slight shift in sensitivity when compared to a previous study on the 2010 population. No highly sensitive strains were isolated from samples from fields, which had received three or four DMI applications.