‘Cody' Buffalograss Tolerance to Combination Post-Emergence Herbicides.

Experiments were initiated 1 July 2013 in Haysville, KS and 7 July 2014 in Manhattan, KS to evaluate ‘Cody’ buffalograss tolerance to various broad-spectrum postemergent herbicides. Treatments included a non-treated, thiencarbazone (0.03 kg ha^-1) + iodosulfuron (0.007 kg ha^-1) + dicamba (0.2 kg ha^-1) [Celsius], flazasulfuron (0.09 kg ha^-1) [Katana], quinclorac (0.87 kg ha^-1) + sulfentrazone (0.07 kg ha^-1) + 2,4-D (1.0 kg ha^-1) + dicamba (0.1 kg ha^-1) [Q₄Plus], carfentrazone (0.03 kg ha^-1) + 2,4-D (1.0 kg ha^-1) + Mecoprop (0.32 kg ha^-1) + dicamba (0.1 kg ha^-1) [Speed Zone], sulfentrazone (0.03 kg ha^-1) + 2,4-D (0.75 kg ha^-1) + Mecoprop (0.27 kg ha^-1) + dicamba (0.1 kg ha^-1) [Surge], 2,4-D (1.0 kg ha^-1) + MCPA (0.3 kg ha^-1) + dicamba (0.1 kg ha^-1) [Trimec Classic], triclopyr (0.17 kg ha^-1) + sulfentrazone (0.02 kg ha^-1) + 2,4-D (0.6 kg ha^-1) + dicamba (0.07 kg ha^-1) [T-Zone], quinclorac (0.8 kg ha^-1) [Drive XLR8], MCPA (1.1 kg ha^-1) + fluroxypyr (0.11 kg ha^-1) + triclopyr (0.11 kg ha^-1) [Battleship III], 2,4-D (0.9 kg ha^-1) + MCPA (0.25 kg ha^-1) + dicamba (0.08 kg ha^-1) [EndRun], sulfentrazone (0.4 kg ha^-1) + quinclorac (1.2 kg ha^-1) [Solitare], sulfentrazone (0.4 kg ha^-1) [Dismiss], carfentrazone (0.03 kg ha^-1) [QuickSilver], sulfentrazone (0.4 kg ha^-1) + metsulfuron (0.04 kg ha^-1) [Blindside], and carfentrazone (0.05 kg ha^-1) + quinclorac (0.85 kg ha^-1) [SquareOne].  Experimental design was a randomized complete block with four replications.  Herbicides were applied in 374 L ha^-1 water at 275 kPa with a CO₂ pressurized boom sprayer with XR8004VS flat-fan nozzles to 1.5 by 1.5 m plots. Buffalograss phytotoxicity, color, quality, and Normalized Digital Vegetation Index were collected 0, 3, 7, 14, 28, 60, and 90 days after treatment (DAT). All data was analyzed using SAS and means were separated according to Fisher’s Protected LSD at α ≤ 0.05. Treatment by year interaction prevented pooling of data.  Authors speculate higher ambient temperatures following application in 2013 increased phytotoxicity.  No buffalograss injury was observed 7 DAT with Katana or QuickSilver in 2013 and with Solitare in 2014. In 2013 and 2014 Speed Zone resulted in 14% buffalograss phytotoxicity, 7 DAT. By 28 DAT in 2013 all herbicide treatments excluding SpeedZone (10%) and T-Zone (5%), resulted in no buffalograss phytotoxicity.  All treatments in 2014 by 28 DAT resulted in no buffalograss phytotoxicity.  Additional studies are underway evaluating ‘Bowie’, ‘Legacy’, ‘609’ and ‘Cody’ buffalograss herbicide tolerance.