Written by cpm
Download PDF Every year in early March a group of plant breeders, researchers and agronomists gather in Cambridge to hear the results of the UK Cereal Pathogen Virulence Survey. CPM was there to find out if there was an explanation for the unexpected incidences of yellow rust reported in some varieties last year. It’s likely new pathotypes will spread in 2020. By Lucy de la Pasture Something strange was happening in KWS Zyatt winter wheat last year. In some areas yellow rust was being detected at an unexpectedly high level for a variety that was rated 8 for resistance on the AHDB Recommended List. Alarm bells rang and the largest number of samples received for testing by UK Cereal Pathogen Virulence Survey (UKCPVS) were from fields of Zyatt, according to NIAB plant pathologist Amelia Hubbard. Confirmation that a new strain of yellow rust was responsible for the sporadic breakdown in Zyatt’s resistance won’t be possible until the results of genotyping come in later this year, but the differential tests that are part of the UKCPVS protocol have identified ten new pathotypes, which were predominantly isolated from Zyatt samples. “A pathotype lists the virulence genes the isolate carries and virulence on…
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