Full TGIF Record # 252246
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Publication Type:
Content Type:Abstract or Summary only
Author(s):Rosser, S. W.; Witt, W. W.
Author Affiliation:Rosser: Graduate Research Assistant; Witt: Associate Professor, Department of Agronomy, University of Kentucky, Lexington, KY
Title:Seedhead inhibition and growth suppression in tall fescue and orchardgrass with thiocarbamates
Section:Forage and range weed control
Other records with the "Forage and range weed control" Section
Meeting Info.:Des Moines, Iowa: December 8-10, 1981
Source:Proceedings: North Central Weed Control Conference. Vol. 36, 1981, p. 41-42.
# of Pages:2
Publishing Information:[Urbana, Illinois: Department of Agronomy, University of Illinois]
Keywords:TIC Keywords: Application rates; Application timing; Butylate; Dactylis glomerata; EPTC; Festuca arundinacea; Growth regulator evaluation; Growth retardation; Seedhead inhibition; Thiocarbamate herbicides; Vernolate
Abstract/Contents:"Interest has been generated in using chemicals which retard grass growth in order to reduce the energy and labor cost involved in multiple mowings on highway rights-of-way and other areas which require mowing. This experiment evaluated 3 thiocarbamates for their potential use as grass growth retardants. Treatments included 10G formulations of butylate, EPTC, and vernolate applied at rates of 4.4, 6.7, and 9 kg/ha to an established sod containing predominantley [predominantly] tall fescue and orchardgrass. There were 4 times of treatment application: October 29, 1980; November 25, 1980; March 24, 1981; and April 30, 1981. The grasses were actively growing only at the April treatment date (3-leaf stage). All other applications were made after growth had stopped in the fall prior to spring regrowth. Seedhead numbers and measurements of flowering shoot heights and total dry matter were taken on July 29, 1981. Treatments applied in March and April generally gave a much greater inhibition of seedhead formation in tall fescue and orchardgrass than treatments applied in October or November. Those treatments which gave a significant reduction in the number of seedheads of both tall fescue and orchardgrass were: March application of EPTC and vernolate at 4.4, 6.7, and 9 kg/ha and April application of vernolate at 9 kg/ha. Treatments giving a significant reduction in tall fescue seedhead numbers ranged from 54 to 92% reduction while significant reduction in orchardgrass seedhead numbers ranged from 66 to 98%. Measurement of flowering shoot heights revealed that there were no significant reductions resulting from October or November treatments in either tall fescue or orchardgrass. Treatments which gave a significant reduction of shoot height of both tall fescue and orchardgrass were: EPTC 9 kg/ha (March application); EPTC 4.4, 6.7, and 9 kg/ha (April application), and vernolate 6.7 and 9 kg/ha (April application). Total dry matter yield was affected only slightly by October and November treatments; however, significant reductions resulted from most of the treatments applied in March and April."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Rosser, S. W., and W. W. Witt. 1981. Seedhead inhibition and growth suppression in tall fescue and orchardgrass with thiocarbamates. Res. Rep. North Cent. Weed Control Conf. 36:p. 41-42.
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