Full TGIF Record # 225765
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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:Pre-mow and post-mow applications of plant growth regulators 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. 56-57.
# 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:"Mefluidide alone, or in combination with chlorsulfuron or a premix of imazethapyr and imazapyr, and CGA 163935 were evaluated for plant growth regulator (PGR) effects after pre-mow and post-mow application to a stand of tall fescue (Festuca arundinacea) at the Landscape Management Research Center. The stand of tall fescue received 1.25 lb N/1000 sq.ft./year during 1988 and 1989, and was mowed weekly with a rotary mower returning clippings at a height of 3.5 in. The treatments were applied May 14, 1990 using a CO2 powered, hand-held boom delivering 17 GPA at 30 psi with Spraying Systems 8002 flat fan nozzles. The turf canopy was 6 to 7 in, and some tall fescue seedheads were just emerging. The post-mow plots were mowed at 3.5 in with clippings removed just prior to treatment application. The experimental design was a randomized complete block with a split-plot treatment arrangement using three replications. The mow treatment whole plots were 15 by 15 ft, with five 3 by 15 ft PGR treatment sub-plots randomized within each whole plot. Each PGR treatment included 0.5 lb ai/acre dicamba and a non-ionic spray adjuvant at 0.25% (v/v). Visual ratings of percent seedhead suppression, turf color, and turf quality were taken July 3, 1990. Seedhead suppression was rated relative to the untreated check, and turf color and quality were rated on a 0 to 9 scale, with a rating of '0' indicating dead turf, '9' ideal turf, and '5' the lowest rating for acceptable turf. The data was subjected to analysis of variance, and the interaction between mowing and PGR treatment was significant for turf quality, and nearly significant for seedhead suppression (P=0.07). The effect of mowing was not significant for any dependent variable, and PGR treatment effects, and PGR treatment effects are reported in Tables 1,2, and 3, respectively. There were fewer seedheads in the untreated check in the post-mow plots compared to the pre-mow plots due to removal during mowing, but this is not reflected in the results as the untreated checks were given a rating of 0 percent seedhead suppression. Turf color ratings were the same for each mow treatment, and were significantly lower than the best PGR treatments due to leaf senescence. Turf quality was rated as unacceptable for the untreated check, and was significantly lower than all PGR treatments due to presence of seedheads and the lower turf color ratings. Mefluidide alone did not perform as well as when combined with other PGR's. Seedhead suppression was rated at 75 percent for the pre-mow and 90 percent for the post-mow applications. It should be emphasized that the post-mow seedhead suppression represents a higher percentage of lesser amount of seedheads, so that the difference is greater than that indicated by the 15 percent difference in ratings. The lower rating for pre-mow treatment would be expected as the unmowed tall fescue was in the beginning of seedhead emergence. Previous research has shown that mefluidide loses effectiveness in suppressing seedheads once tall fescue reaches boot stage. There were no turf color differences between mow treatments for mefluidide alone, but the post-mow application was rated significantly better for turf quality, due to the greated amount of seedheads in the pre-mow plots. Mefluidide in combination with either chorsulfuron or imazethapyr plus imazapyr provided excellent seedhead suppression, and received the best ratings for turf color and turf quality for both mow treatments. CGA 163935 provided partial seedhead suppression, and the seedheads that were produced were shorter. This is not unexpected as this compound inhibits internode elongation, rather than preventing it. In the post-mow plots, a portion of the seedheads were not affected by the mowing and continued to elongate, as seedhead emergence was only beginning at the time of mowing. Turf color ratings were lower than the untreated check, and significantly lower than the other PGR's, though still acceptable. Turf quality ratings were acceptable, and significantly better than the untreated check due to presence of fewer seedheads, but were significantly better than the untreated check due to presence of fewer seedheads, but were significantly lower than the other PGR treatments."
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. Pre-mow and post-mow applications of plant growth regulators to low maintenance tall fescue. Turfgrass Research Results 1990/1991 [Penn State]. p. 56-57.
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