Non‐target site SDHI resistance is present as standing genetic variation in field populations of Zymoseptoria tritici

A new generation of more active succinate dehydrogenase (Sdh) inhibitors (SDHIs) is currently widely used to control Septoria leaf blotch in northwest Europe. Detailed studies were conducted on Zymoseptoria tritici field isolates with reduced sensitivity to fluopyram and isofetamid; SDHIs which have only just or not been introduced for cereal disease control, respectively.Strong cross-resistance between fluopyram and isofetamid, but not with...