Decreasing azole sensitivity of Z. tritici in Europe contributesto reduced and varying field efficacy

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DOI

  • Lise Nistrup Jørgensen
  • Niels Matzen
  • Thies Marten Heick
  • N Havis, SRUC, Storbritannien
  • S Holdgate, NIAB, Storbritannien
  • B Clark, NIAB, Storbritannien
  • J Blake, ADAS Rosemaund, Preston Wynne, Storbritannien
  • M Glazek, Institute of Plant Protection, Sosnicowice, Polen
  • M Korbas, Institute of Plant Protection – National Research Institute, Polen
  • J Danielewicz, Institute of Plant Protection – National Research Institute, Polen
  • C Maumene, ARVALIS - Institut du végétal, Frankrig
  • B Rodemann, JKI, Tyskland
  • S Weigand, Institut für Pflanzenschutz Bayerische Landesanstalt für Landwirtschaft, Tyskland
  • S Kildea, Teagasc, Oak Park, Irland
  • C Bataille, CRA-W, Protection des plantes et écotoxicologie, Belgien
  • E Brauna-Morzevska, Latvian Plant Protection Research Centre, Riga, Letland
  • K Gulbis, Latvian Plant Protection Research Centre, Riga, Letland
  • R Ban, Plant Protection Institute, Plasmoprotect, St. Istvan University, Ungarn
  • G Berg, Swedish Board of Agriculture, Alnarp, Sverige
  • R Semaskiene, Institute of Agriculture, Lithuanian Research Centre for Agriculture and Forestry, Litauen
  • G Stammler, BASF SE, Tyskland

Septoria tritici blotch (STB; Zymoseptoria tritici) is the most important leaf disease of wheat in Northern and Western Europe. The problem of fungicide resistance in Z. tritici populations is challenging future control options. In order to investigate differences in azole performances against STB, 55 field trials were carried out during four seasons (2015–2018). These trials were undertaken in ten different countries across Europe covering a diversity of climatic zones and agricultural practices. During all four seasons, four single azoles (epoxiconazole, prothioconazole, tebuconazole and metconazole) were tested. Increasing variability in the performances of these azoles against STB was observed across Europe. The efficacy of the tested azoles varied considerably across the continent and between countries. The shifts in disease control from these commonly used azoles were confirmed by increasing EC 50 values for epoxiconazole, prothioconazole-desthio and metconazole. The sensitivity towards tebuconazole remained relatively low across the four years. The frequencies of CYP51 mutations varied substantially across Europe, with a clear pattern of significantly decreasing frequencies of D134G, V136A and S524T in the local Z. tritici populations from west to east. In contrast, no major differences were seen for CYP51 mutations V136C, A379 and I381V. The four azoles showed different levels of cross-resistance, which again depended on specific CYP51 mutations. Across the four seasons, the single azoles increased the yields between 9 and 11% on average.

OriginalsprogEngelsk
TidsskriftJournal of Plant Diseases and Protection
Vol/bind128
Nummer1
Sider (fra-til)287-301
Antal sider15
ISSN1861-3829
DOI
StatusUdgivet - feb. 2021

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