Written by Charlotte Cunningham
AHDB’s online edition of the Recommended Lists for cereals and oilseeds 2021/22 will feature major changes to rust disease-resistance ratings. Charlotte Cunningham reports. These changes follow the development of a new rating calculation approach that better reflects the diverse and dynamic nature of the UK’s rust populations, according to AHDB. Due for launch on Monday 30 Nov 2020, the latest developments will also feature during AHDB’s Agronomy Week – a five-day series of online webinars and videos, covering contemporary agronomy – that starts on the same day. Catherine Harries, who works on the RL disease ratings at AHDB, said: “The yellow rust population structure varies in time and space, right down to variation across a single leaf. With rust pathogen populations continually evolving and disease pressure increasing, we have recently encouraged closer crop inspections. This is the best way to assess in-season pressures. However, it’s become clear that we need to overhaul the rating’s process, in response to the new reality of tremendous rust diversity.” More representative During 2020, the RL board has consulted with agronomists, farmers, pathologists, wheat breeders and statisticians, to develop a new, more representative method to calculate brown and yellow rust ratings. To complement the adult-stage…
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