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Download PDF With questions raised over fungicide resistance in OSR and the best course of preventative action, an AHDB project set out to discover the current status quo and look at the best tactics to protect fungicide efficacy in the field. CPM investigates. Additional CYP51 mutations will evolve eventually that can coexist with others. By Lucy de la Pasture While resistance management strategies have become a core part of fungicide programmes in cereal crops, oilseed rape has been somewhat lagging behind. A research project, funded by AHDB and partnered by industry, has been evaluating the risk of resistance developing in the main OSR diseases and looking at the best way to manage this risk in a cost-effective way. Catherine Harries, who manages cereal and oilseeds disease research at AHDB, says there’s a very real threat of fungicide resistance developing in OSR diseases. “Azole-insensitive strains of Pyrenopeziza brassicae, which causes light leaf spot (LLS), are already present in the UK. In Europe resistance to SDHIs has been reported in Sclerotinia sclerotiorum (sclerotinia) and further afield in Australia, azole insensitivity has been found in Leptosphaeria maculans (phoma stem canker). Such strains are likely to occur here eventually,” she says. Of all the…
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