Full TGIF Record # 225762
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Author(s):Gover, Arthur E.; Watschke, Thomas L.; Lyman, Gregory T.
Author Affiliation:Gover: Project Associate; Lyman: Former Project Assistant, Agronomy; Watschke: Professor, Turfgrass Science
Title:Comparison of CGA 163935 and established PGR combinations applied pre-mow to low maintenance tall fescue
Section:1990 results: Roadside vegetation management studies
Other records with the "1990 results: Roadside vegetation management studies" Section
Source:Turfgrass Research Results 1990/1991 [Penn State]. 1991, p. 54-55.
# of Pages:2
Publishing Information:[University Park, Pennsylvania]: [Pennsylvania State University, College of Agriculture, Agronomy Dept., Entomology Dept., Horticulture Dept., Plant Pathology Dept.]
Abstract/Contents:"Three rates of CGA 163935, mefluidide plus chlorsulfuron, mefluidide plus metsulfuron methyl, mefluidide plus a premix of imazethapyr and imazapyr, and an untreated check were applied to tall fescue (Festuca arundinacea) on April 26, 1990. The tall fescue was at 100 percent greenup, 3 to 5 in, and no indication of internode elongation was observed. The experimental plots were 3 by 10 ft, arranged in a randomized complete block design with three replications. The tall fescue was maintained at 3.5 in with a rotary mower returning clippings, and received 1.25 lb N/1000 sq. ft./yr in 1988 and 1989. The treatments were applied with a CO2 powered hand held boom, delivering 17 GPA at 30 psi with Spraying Systems 8002 flat fan nozzles. All PGR combinations included dicamba at 0.5 lb ai/acre and a non-ionic spray adjuvant at 0.25% v/v. Visual ratings of percent seedhead suppression, turf color, and turf quality were taken June 5 and July 3, 39 and 67 days after treatment respectively. Seedhead suppression was rated against the untreated check. Turf color and quality were rated on a 0 to 9 scale, with 0 being dead turf, 9 ideal turf, and 5 the lowest acceptable rating. Application rates and results are reported in Table 1. The untreated check was rated at 0 percent seedhead suppression at both rating dates. For the June 5 rating, turf color was rated excellent, but turf quality was barely acceptable due to unchecked growth and the presence of seedheads. When rated July 3, the turf color rating had declined to 5.3 due to senescence of the older leaves, and turf quality was rated as unacceptable. Mefluidide alone and in combination with chlorsulfuron, metsulfuron methyl, and the premix of imazethapyr provided good to excellent seedhead suppression, and acceptable turf color and quality ratings. Mefluidide plus imazethapyr and imazapyr plots were rated best for color and quality at the June 5 ratings, but by July 3, there were no significant differences between any of the mefluidide combinations. CGA 163935 did not provide the degree of seedhead suppression that the mefluidide combinations did. This result was expected, as CGA 163935 acts to reduce internode elongation rather than prevent it. Seedheads observed in CGA 163935 plots were shorter than those in the untreated check, and increasing rates of CGA 163935 were observed to decrease seedhead elongation. There were no significant differences in turf color or quality ratings between the three rates of CGA 163935. Turf color and quality ratings were acceptable at the June rating, but turf quality declined and was rated unacceptable to barely acceptable at the July 3 rating, due to the presence of seedheads."
Note:This item is an abstract and table only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Gover, A. E., T. L. Watschke, and G. T. Lyman. 1991. Comparison of CGA 163935 and established PGR combinations applied pre-mow to low maintenance tall fescue. Turfgrass Research Results 1990/1991 [Penn State]. p. 54-55.
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