Use of quinclorac plus 2,4-D for controlling field bindweed (Convolvulus arvensis) in fallow

Field studies were conducted in Colorado, Kansas, and Wyoming to compare th e use of quinclorac plus 2,4-D with picloram plus 2,4-D, dicamba plus 2,4-D , a glyphosate plus 2,4-D premix, and 2,4-D alone for control of field bind weed (Convolvulus arvensis) in a winter wheat (Triticum aestivum)-fallow ro tation. Treatments were applied in late summer or fall each year for two, t hree, or four consecutive years at the beginning and end of each fallow per iod. Evaluations were taken 10 to 12 mo after treatment each year. Quinclor ac plus 2,4-D and picloram plus 2,4-D consistently performed as well as or better than 2,4-D, dicamba plus 2,4-D, and glyphosate plus 2,4-D. Wheat yie lds increased when field bindweed was controlled during the fallow period. Strong correlations (r > -0.85) were obtained among visual field bindweed e valuation, biomass, and stand count data.