Full TGIF Record # 8275
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Publication Type:
Author(s):Witt, W. W.; Wells, R. L.; Cole, M. D.
Author Affiliation:University of Kentucky
Title:Selective Johnsongrass control in tall fescue rights-of-way
Source:Kentucky Turfgrass Research. 1985, p. 25-28.
Publishing Information:Lexington, KY: University of Kentucky, College of Agriculture, Cooperative Extension Service
Keywords:TIC Keywords: Broadleaf weed control; Herbicide combinations; Herbicide trials; Herbicide interaction; Antagonism; Phytotoxicity; Herbicides; Selective weed control; Utility turf; Sorghum halepense; Festuca arundinacea
Abstract/Contents:1985 study to: 1) Find postemergence herbicide to selectively remove johnsongrass from tall fescue without reducing tall fescue density and having little, if any tall fescue phytotoxicity. 2) Describe the application factors that could influence the selective removal of johnsongrass from tall fescue. 3) Determine if tank mixtures with other herbicides could result in tank mix antagonism which would result in less johnsongrass control. Herbicides were Assure at 0.06 or 0.125, Fusilade at .125 or .25, Poast at 0.2 or 0.4, Verdict at .06 or .125, and Acclaim at 0.1 or 0.2 lb ai/A. Each treatment was applied in 2 carrier volumes (25 and 50 gpa) and with and without the broadleaf herbicide 2,4-D at 2.0 lb ai/A. A table provides treatments and johnsongrass control ratings. Greater than 70% johnsongrass control was obtained with both rates of Fusilade and one rate of Poast, Verdict, and Acclaim when applied in 25 gpa. Comparisons between results with the different carrier volumes revealed slightly greater control with the 25 gpa carrier volume. The addition of 2,4-D at 2 lb ai/A severely reduced the efficacy of Assure, Fusilade, and Verdict. Less severe reductions was noted with Poast and Acclaim. This tank-mix antagonism between grass herbicides and 2,4-D was evident at 25 and 50 gpa. Tall fescue regrowth was determined 12 months after application. Following the same trend as in johnsongrass control, the addition of 2,4-D inhibited tall fescue injury from the grass herbicides. Less tall fescue injury was noted when treatments were applied at 50 gpa. Acclaim and Poast treatments had the greatest amount of tall fescue remaining 12 months after application.
Geographic Terms:Kentucky
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Witt, W. W., R. L. Wells, and M. D. Cole. 1985. Selective Johnsongrass control in tall fescue rights-of-way. KY. Turfgrass Res. p. 25-28.
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