Exceptional disease resistance is a standout feature among new oilseed rape and cereal varieties joining the AHDB Recommended Lists for 2019/20.
With five new winter wheat varieties making the new list, KWS Extase sets a new standard for septoria tritici resistance with a rating of 8.1 – the first time a rating of 8 has been achieved, according to AHDB. A nabim Group 2 wheat, KWS Extase has produced high yields in the West and limited data suggests the variety also has a high yield potential in the North. It also has high resistance to yellow rust (9).
Also joining in the Group 2 category is LG Detroit. This variety has produced high yields in the West, has high resistance to yellow rust and above average resistance to fusarium ear blight.
LG Detroit is the only Group 2 variety to have resistance to orange wheat blossom midge.
In Group 3 KWS Firefly’s recommendation bring improved septoria tritici resistance to the group, with its 7.0 rating a point up on 2018/19 newcomer and former top rated variety Elicit.
“Elicit was added last year and at that time was a real step forward with a septoria rating of 6.0. KWS Firefly has improved septoria tritici resistance over established Group 3 varieties and has given high yields in untreated trials,” says AHDB Recommended List manager Dr Jenna Watts.
In Group 4 hard wheats have ceded the RL top spot for yield to a soft wheat newcomer in the form of LG Skyscraper. With a yield rating of 106, this variety has given very high yields across the UK, across a range of soil types and rotational positions.
LG Spotlight also joins the list in the Group 4 soft category and is another very high yielding variety for the UK and the West in particular. This variety has high resistance to yellow rust and above-average resistance to fusarium ear blight (7).
The interest of feed barley growers will be piqued by the addition of four two-row winter barleys in KWS Gimlet, LG Mountain, LG Flynn and Valerie and two six-row hybrids, SY Baracooda and SY Kingsbarn, the latter with a 69.9 specific weight.
One new spring barley Cosmopolitan variety joins the list and is under test for brewing.
In other barley RL developments, AHDB announced that provision of ramularia leaf spot ratings has been suspended.
With 9 winter oilseed rape varieties joining the new list, a key development is the inclusion of untreated gross output (GO) figures for varieties which have been recommended for at least one year.
Growers should note the figures provided by AHDB are expressed as a percentage of the untreated control, not the treated control as is the case for cereals.
Newcomers to the 2019/20 RL include open-pollinated varieties Aspire, Ballad and restored hybrid DK Expansion, all of which have UK recommendations. Aspire also has resistance to turnip yellows virus (TuYV).
Restored hybrids PT275 and George have been added to the East/West region list. George has the strongest resistance to phoma stem canker on the East/West list (8), although this is based on limited data. DK Exsteel joins the North region list, with a 7 rating for light leaf spot and 8 for phoma stem canker.
Three varieties have been recommended for specific purposes: Temptation joins Architect and Aspire on the list of varieties with TuYV resistance; Crome, with gross output yields in excess of the treated control, marks a step change in the performance of clubroot-tolerant varieties and with recognition of herbicide tolerance as a specific RL category, Clearfield variety PT297CL is added to the list with tolerance to specific imidazolinone herbicides.