Choice of variety can make or break rotation
Growers need to feel confident when introducing any new variety to the rotation because genetics can make or break a profitable year. “Resilience has been high on the agenda for growers – with yellow rust and septoria resistance a key part of this,” says NIAB cereal variety spe- cialist Clare Leaman. “It has been a difficult few years for crops, with significant pressures from weather extremes, pest and disease challenge, and changes in policy. But no one size fits all so it’s im- portant that growers look at individual profiles.” The right varieties can reduce risk. “They in- crease the choice and range of crop profiles, which
allows growers to select varieties which are bet- ter suited to their conditions, as well as expand- ing their marketing options.”
AHDB senior field trial manager Mark Bolle- bakker says: “There are some exciting new vari- eties on the list this year – but growers need to be looking at their own specific disease pressures and crop challenges rather than focusing on yield.” Four out of five newly listed Group 3 wheat varieties were on display at last month’s Cere- als event in Lincolnshire. “A development for this group is a notable improvement in Septoria re- sistance,” says Mr Bollebakker.
Angus Wheat Consultants, said the demise of resistance on Cou- gar was highly predictable. “If we are not careful, we will follow the same ‘boom and bust’ cycle which has existed for yellow rust for over 60 years,” he added. “Breeders have done a really good job by accumulating minor genes for septoria resistance and this has the potential to be un- done by utilising major genes – often introduced from related species.”
Mr Angus added: “There has been a migration by growers to varieties with high levels of dis- ease resistance – but many of the resistances being deployed pre- sent high risks of variety break- down, and sadly we are now see- ing this in the field. “We are likely to see variation
in resistances within the Cougar derivatives as we discover just which minor genes have been car- ried through. A look at the ped- igrees will help as just crossing Cougar with an already suscepti- ble variety is a high risk strategy.” Growers needed to select di-
versity when it came to choosing varieties, said Mr Angus. To help them do so, there needed to to be a return to publishing variety pedigrees on the Recommend- ed List.
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AUGUST 2021 • MIDLAND FARMER 17
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