Written by Tom Allen-Stevens
Download PDF With Clearfield oilseed rape now a mainstream choice for growers, CPM visits a field in Hants where charlock problems had precluded any other options. By Tom Allen-Stevens More than 10% of oilseed rape varieties harvested this year will be Clearfield hybrids, according to figures released by BASF and Dekalb. The area grown to the varieties, which have resistance bred in to the herbicide imazamox, has doubled every year since 2014. “The technology is no longer just used by early adopters – it’s gone mainstream,” says Dekalb marketing manager Mark Shaw. “The largest uptake has been in the east and south east of England. We’ve seen the West Midlands gather momentum this year, although the varieties have been used less in Scotland.” Clearfield has gone mainstream, says Mark Shaw. Clearfield OSR varieties were introduced to the market in 2012. The genes conferring tolerance to imidazolinone herbicides were discovered by BASF who developed the trait and passed on the toolkit to breeders to bring into commercial lines in 1992. They can be oversprayed with the broad-spectrum post-emergence broadleaf weed herbicides Cleranda (imazamox+ metazachlor) and Cleravo (imazamox+ quinmerac). There’s now over 60,000ha of the varieties grown in the UK, according…
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