Response of wheat (Triticum aestivum) and associated weeds to clopyralid in combination with other herbicides

An experiment was conducted during winter season of 1990 91 and 1991 92 to study response of wheat (Triticum aestivum L. emend. Fiori & Paol.) to herb icides, Clopyralid + isoproturon at 375 + 750 g/ha effectively controlled C irsium arvense (L.) Scop., Rumex maritimus L., chenopodium album L. and Pha laris minor Retz. Fluroxypyr + isoproturon or tribenuron + isoproturon did not control Cirsium arvense. The effects of these combinations on Phalaris minor were more when applied 3 weeks after sowing (WAS) than at 5 weeks. Th e grain yields of wheat following the treatments of clopyralid + isoproturo n at 375 + 750 g/ha, fluroxypyr + isoproturon at 150 + 750 g/ha or tribenur on + isoproturon at 7.5 + 750 g/ha each applied 3 or 5 weeks after sowing w ere significantly more than the weedy check. Application of 2, 4-D + isopro turon at 500 + 750 g/ha done at 5 weeks also increased the grain yield of w heat significantly over weedy check.