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Main wheat varieties ‘have lower resistance to yellow rust’ than last year, Agrii National Cereal Disease Survey finds

PUBLISHED: 12:27 06 September 2017 | UPDATED: 12:27 06 September 2017

Yellow Rust spores can be seen bursting out of a wheat leaf from the inside, tearing their way through the epidermis.

Yellow Rust spores can be seen bursting out of a wheat leaf from the inside, tearing their way through the epidermis.

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The majority of this year’s main winter wheat varieties have a lower yellow rust resistance than their 2017/18 ratings, according to a study.

Rosemary Bayles & Jim Carswell examine tussock plots at AgriiFocus. Picture: AGRIIRosemary Bayles & Jim Carswell examine tussock plots at AgriiFocus. Picture: AGRII

The Agrii National Cereal Disease Survey found almost two thirds of mainstream winter wheat varieties have a lower resistance to the disease than their current Recommended List (RL) ratings suggest after monitoring through a series of national variety trials and tussock plots at Agrii Technology Centres and iFarms.

“A progressive fall-off in resistance is only to be expected with varieties that have been widely grown for a number of years. More worryingly, though, we’ve recorded seven of the 11 new varieties on the RL, as well as several candidates with yellow rust resistance scores at least a point lower than their official ratings suggest,” said Jim Carswell, research and development manager at the agronomy advice firm. Later sowing will help reduce disease pressure, he added.

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