BASF Canada developed Clearfield bread wheat varieties BW255-2 and BW238-3 tolerant to imidazolinone herbicides by chemical mutagenesis of seed and traditional breeding. Clearfield in WSU 16-20 2020 average. Latest report can be found in Steve Watsons Wheat Varieties for Kansas 1989, No longer in use. No longer in widespread use. However, there will still be some provisos attached to that offer. Check out the Behind the Seeds video and find out how Brevant started, the strong R&D engine behind the brand, and the high-yielding portfolio of canola hybrids and soybean varieties suited to farmers across Canada. Minor reductions in the yield of non Clearfield wheat varieties in the 1x Intervix rate plots (750ml/ha) was observed, while significant reductions were observed in non Clearfield wheat varieties at the off label rate of 2x Intervix (1500ml/ha). [CDATA[// >, No longer in widespread use.