Скачать или смотреть Unusual yellow rust: Symptoms at our Norfolk winter wheat on trial site

In April 2025, Recommended Lists (RL) trial inspections in the RL winter wheat North region, found unusual signs of yellow rust on many varieties classified as resistant at the young plant (seedling) stage in the latest RL (2025/26).

In this video, Mark Bollebakker, who manages the RL trials at AHDB, provides an update on the situation from our winter wheat on trial site, which is in the RL winter wheat East region (in Norfolk).

The plots were around growth stage 37 (flag leaf just visible) around the start of May. In the fungicide-untreated plots, yellow rust was starting to develop with a similar pattern to the trials in the North (in terms of varieties affected). Some of the varieties were showing symptoms on the leaf tips or along the middle of the leaves but the classic stripiness was starting to appear. Septoria tritici pressure was relatively low.

As the yellow rust pathogen population is highly diverse, it is not unusual to detect new strains. But the observations suggest that the latest change is significant. At present, we do not know how much this will impact adult stage resistance and varieties may still outgrow initial infection.

We will continue to assess varieties to determine the full impact of the change.

All varieties will need to be monitored closely, and farmers should also not rely on the disease ratings in RL 2025/26.

Learn more about the RL winter wheat on trial initiative: ahdb.org.uk/rl-trials

Welcome to AHDB Cereals & Oilseeds, a statutory levy board funded by farmers and others in the supply chain. Our purpose is to be a critical enabler, to positively influence outcomes, allowing farmers, growers and others in the supply chain to be competitive, successful and share good practice. We equip levy payers with easy to use products, tools and services to help them make informed decisions and improve business performance. Established in 2008 and classified as a Non-Departmental Public Body, AHDB supports the following industries: meat and livestock (Beef, Lamb and Pork) in England; Dairy in Great Britain; and Cereals and Oilseeds in the UK.

For further information visit www.ahdb.org.uk

Follow us on social media
X   / ahdb_cereals  
Facebook   / ahdbcereals  
Instagram   / ahdb_cereals