Amalie,the resistant TuYV OSR variety, has yielded 5t/ha in its first commerciallyrecorded harvest, a tonne per hectare over non-resistant varieties on the samefarm.
Harvested at the Hutchinsons Black-grass Centre atBrampton on Monday 20th July, the 30ha block of Amalie yielded asmuch as 7.5t/ha in some places but averaged out on the weighbridge at 5t/ha.Similar amounts of non TuYV resistant varieties, Cabernet and Charger yielded3.8t/ha and 4t/ha respectively says Hutchinsons Dick Neale who has beeninvolved with the crops season-long.
We can assume that the yield difference must comedown to the TuYV resistance as the crops were all treated the same throughoutthe season, and infact all the crops were swathed so could actually haveyielded about 0.25t/ha more.
Mr Neale confirms that having established wellafter drilling on the 23rd August, the crops looked good all season,although the non-resistant varieties Cabernet and Charger definitely showedearly signs of TuYV infection such as purpling of the leaves, which the Amaliedidnt says Mr Neale.
Amalie remains the only commercially availableoilseed rape variety with resistance to TuYV on the market, and the variety wasre-submitted as a candidate in the 2014-2015 HGCA RL trials based on thistrait.
Amalie is a conventional OSR variety that offers agross output similar to the widely grown variety, DK Cabernet. However, ourown trials using untreated seed over the last four years have clearly shownthat where TuYV is present, Amalie can yield up to around 10% more thannon-resistant varieties, so this first commercial result confirming what wehave seen in trials is very exciting, says Will Compson, oilseed productmanager with breeders Limagrain.
Mr Compson recognizes that this is just the firstresult adding that looking ahead we will continue to report on how the varietyperforms for the rest of the harvest and across regions but this first resultis fundamental and means that variety choice will be even more critical thanever and will require a change in mind set where resistance and agronomics playan increasingly crucial role in order to protect yield.
Agronomically the variety offers sound agronomicsand robust disease resistance ratings, with a 7 for LLS and 8 for phoma, so withno obvious weaknesses there is a serious case for growers to consider making itpart of their OSR cropping this season.