BYDV-resistant wheat thrives despite high aphid pressure

Updated: Jun 18, 2020

RAGT’s breakthrough BYDV-resistant wheat RGT Wolverine is living up to its promise of delivering season-long protection against the virus, reducing the reliance on foliar-applied insecticide sprays.

The BYDV plots provided a tough test, says Tom Dummett

The hard Group 4 feed wheat variety, which will be available in limited quantities for sowing this autumn, has showed no signs of the yield-sapping disease in RAGT’s trials in Cambridgeshire up to the first week of June, despite multiple inoculations with virus-laden aphids.

Ten popular Recommended List varieties in the trial were all affected by the disease, particularly when early sown. Sypmtoms ranged from a few yellow and red leaved plants to multiple stunted areas with severe leaf loss.

To help ensure all plots were exposed to the same BYDV pressure, plants inoculated with aphids were placed next to each plot, four times in the autumn and five times in the spring. The aphids, supplied by Rothamsted Research, were infected with the most common BYDV strain, PAV.

Each plot was then assessed weekly for BYDV symptoms starting from mid April, a process that will continue through to senescence. Scores ranged from zero (no signs) to four (very obvious symptoms and multiple stunted sites).

There were stark differences in terms of how much virus was present and how quickly it developed (see graph).

“The results clearly demonstrate the effectiveness of the Bdv2 resistance gene in our BYDV-resistant material,” says cereal and OSR product manager Tom Dummett. “This builds on earlier findings from our laboratory and field experiments as well as almost two decades of commercial experience with Bdv2 varieties in Australia.