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First report of virulence to the septoria tritici blotch resistance gene <i>Stb16q</i> in the Irish <i>Zymoseptoria tritici</i> population
Kildea, S. Byrne, J.J Cucak, M. Hutton, F.
Kildea, S.
Byrne, J.J
Cucak, M.
Hutton, F.
Date
2020-2-2
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Kildea, S., Byrne, J.J., Cucak, M. and Hutton, F., First report of virulence to the septoria tritici blotch resistance gene Stb16q in the Irish Zymoseptoria tritici population. New Disease Reports, 2020, 41, 13-13., https://doi.org/10.5197/j.2044-0588.2020.041.013
Abstract
In June 2019 high levels of septoria tritici blotch (STB), caused by the fungal pathogen Zymoseptoria tritici were observed in Recommended List evaluation plots of winter wheat cv. Cellule (Fig. 1) in the Republic of Ireland. Levels of STB were unexpected as Cellule has the STB resistance gene Stb16q and previous evaluations confirmed its high level of resistance (Table 1). Septoria tritici blotch is the most destructive disease of winter wheat in Western Europe and control is heavily reliant on fungicides (O'Driscoll et al., 3). Due to increased regulations on the use of fungicides in Europe varietal resistance is regarded as key to managing STB, with 21 resistance genes identified and mapped (Brown et al., 1). Amongst these, Stb16q is unique, providing high levels of resistance equally at both the seedling and adult plant stages (Ghaffary et al., 2). As such it is important to determine if the levels of disease observed in 2019 were due to the emergence of virulence to Stb16q.