Septoria levels a
‘one-off’ in Cougar one-off incident. It means growers continue to have very good varieties avail- able to help them manage this disease.” The research was deliv- ered by the team behind the UK Cereal Pathogen Virulence Survey (UK- CPVS). Managed by NIAB, and funded by AHDB and Defra, UKCPVS analyses leaf samples infected with rusts and mildews. From these samples, pathogen isolates are se- lected and tested to check their virulence against wheat and barley varieties. The testing can detect new races of cereal pathogens capable of causing disease on previously resistant ce- real varieties.
Unexpected levels of septo- ria tritici infection reported on the winter wheat varie- ty Cougar in 2015 appear to have been limited to that specific variety. The conclusion is based on AHDB-funded research that analysed septoria trit- ici isolates collected from the field in 2015. Tests on a range of Recommended List varieties found that these isolates could only overcome the resistance mechanisms in Cougar it- self.
Catherine Garman, who manages disease re- search at AHDB, said: “Be- cause the Cougar isolates did not overcome resist- ance in other varieties, it appears to have been a
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