The yellow rust resistance rating of some major wheat varieties, such as Reflection and Diego, are being cut sharply after new races of the disease have been discovered. Seven winter wheat varieties saw a drop of two points or more in their yellow rust ratings, with Reflection downgraded to 3 from 6 on the AHDB scale, where 9 is good resistance and 1 is very susceptible. Biscuit-making wheats Britannia and Zulu and feed wheat Myriad all fell four points to […]
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