Written by Charlotte Cunningham
Recent changes to wheat rust disease resistance ratings might be associated with new pathotypes that have unique patterns of infection, according to the latest announcement from AHDB. Charlotte Cunningham reports. The new additions bring further disease resistance-unpicking power to the highly diverse cereal pathogen population, according to AHDB. “The complexity of rust populations means it is essential to closely monitor cereal crops and report unexpected levels to the UK Cereal Pathogen Virulence Survey (UKCPVS).” An update on the UK cereal pathogen population featured at the UKCPVS Stakeholder Event in Cambridgeshire on 4 March 2020. Each year, the NIAB-led team receives infected leaf material from across the country. From this material, they select five representative wheat yellow rust and wheat brown rust isolates for tests on Recommended Lists (RL) varieties and candidates the following year. Wheat yellow rust results Most varieties known to be relatively resistant to yellow rust (ratings 7–9) continued to perform well in the 2019 inoculated trials. However, some varieties reacted to a single isolate. In some commercial crops during 2019, higher than expected levels of yellow rust were reported. Some untreated RL trials also exhibited an unusually high level of infection on some varieties. Catherine Harries, who…
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