In turfgrass systems, two and three-way herbicide combinations are popular and effective options for controlling a wide variety of annual and perennial broadleaf weeds.  The objectives of this study were to compare broadleaf weed control between several combination herbicides in bermudagrass and perennial ryegrass.  Four trials were initiated May 17^th in Blacksburg, VA, two in perennial ryegrass and two in bermudagrass.  For  perennial ryegrass trials, treatments were 1) QP 17202 at 1350g ai ha^-1, 2) QP 17203 at 1460g ai ha^-1, 3) a triclopyr + clopyralid combination at 420g ai ha^-1 and 4) a triclopyr + clopyralid combination at 840g ai ha^-1, 5) a dicamba + 2,4-D + mecoprop-p combination at 1390g ai ha^-1 and 6) a dicamba + 2,4-D + mecoprop-p combination at 1850g ai ha^-1,  7) a 2,4-D + mecoprop-p + dicamba combination at 1810 g ai ha^-1, and 8) a 2,4-D + clopyralid + dicamba combination at 1250g ai ha^-1.  For bermudagrass trials, there were slight variations in treatments.  Treatments 1-7 were the same, treatment 8 was excluded, and three new treatments were added: QP 16202 at 355g ai ha^-1, metsulfuron-methyl at 42g ai ha^-1, and a thiencarbazone + iodosulfuron + dicamba combination at 176 g ai ha^-1.  Weed control, weed cover, and turfgrass injury were measured at 7, 14, 28, and 35 DAT. 

In bermudagrass, metsulfuron-methyl controlled white clover and dandelion 99-100% at 35 DAT and better than other treatments.  Most other treatments had similar control.  Experimental treatment QP 17202 and QP 17203 varied in weed control by location.  In one location, QP 17202 controlled both weeds 94% or better at 35 DAT, while in another location, white clover and dandelion control decreased to 77 and 50%, respectively.  Similar results were seen with QP 17203.  There were little differences between QP 16202, triclopyr + clopyralid combinations, and the dicamba + 2,4-D + mecoprop-p combination treatments.  The thiencarbazone + iodosulfuron + dicamba combination controlled white clover 99-100%, but varied in dandelion control, ranging from 53% control in one location to 99% control in another.  Bermudagrass was not injured by any treatment.    

In perennial ryegrass, all treatments controlled white clover and dandelion greater than 94%.    Experimentals QP 17202 and 17203 controlled both weeds better than other treatments.   Perennial ryegrass was not injured.  These data suggest that there are several options for annual and perennial broadleaf control in warm and cool-season turf.  Variations in control could be attributed to environmental factors or differences in weed pressure.  Several of the treatments are commercially available.  Others, such as QP 17202, QP 17203, and QP 16202, are experimentals that can provide efficacious control of white clover and dandelion, potentially expanding the available options for broadleaf weed control in the near future.