Clearﬁeld OSR being more widely adopted Applying a Clearfield herbicide to a Clearfield rape variety gives excellent control of some of the most difficult weeds such as charlock, runch and shepherd’s purse, as well as controlling non-Clearfield rape volunteers.
BASF’s Clearfield production system combining hybrid rape seed varieties with a highly effective post-emergence herbicide is being much more widely adopted by growers in his region, according to Frontier Agriculture’s northern regional agronomy manager, Nigel Foster. Using conventional
plant breeding techniques, rape varieties have been developed to tolerate the Clearfield herbicides such as Cleravo (imazamox and quinmerac). Applying a Clearfield herbicide to a Clearfield rape variety gives excellent control of some of the most difficult weeds such as charlock, runch and shepherd’s
purse as well as controlling nonClearfield rape volunteers, while the crop thrives. Nigel cites the key reasons for Clearfield’s wider adoption. The first concerns high erucic acid being detected in some samples of oilseed rape. “We have seen a few situations where high erucic acid has been detected in samples and growers have suffered penalties as a consequence,” he says. Maximum level for food oils is five per cent and FOSFA limit for tradable grain is set at two per cent. “More analysis is being done now at the plant where seed is crushed, but it can mean significant penalties or even rejection,” continues Nigel. “While the source of erucic acid contamination in the oilseed is not fully understood, cruciferous weeds such as charlock, hedge mustard, and runch may be a source along with volunteer rape. Clearfield does
a remarkable job of controlling difficult brassica weeds as well as controlling any rape volunteers from previous crops or as admixture in the seed lot. A Clearfield variety allows the grower to establish a purer stand,” he explains.
All post-em “Clearfield herbicides are all post-emergence, and so suit all establishment systems. The Clearfield oilseed rape varieties get away fast – unhindered by any potential ALS herbicide residues in the soil from ALS herbicides applied late in preceding wheat crops. They seem more able to cope with challenges such as cabbage stem flea beetle which is important in the absence of neonicotinoid seed treatments. It also means that you can clearly see if the crop is worth hanging onto before you spend money on further inputs which is a problem in conventional varieties where expensive but effective preemergence herbicides need to be used,” comments Nigel, who says that there is an increasing problem with brassica weeds in rape in the
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Published on Feb 2, 2017