Full TGIF Record # 147209
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Publication Type:
Content Type:Abstract or Summary only
Author(s):Pigati, R. L.; Dernoeden, P. H.
Author Affiliation:University of Maryland, College Park, Maryland
Title:Creeping bentgrass scalping and quality as influenced by ethephon and trinexapac-ethyl
Section:Abstracts and project summaries
Other records with the "Abstracts and project summaries" Section
Source:2008 Turfgrass Pathology and Weed Science ResearchSummaries [Maryland]. 2008, p. 70.
# of Pages:1
Publishing Information:College Park, MD: University of Maryland Department of Natural Resource Sciences and Landscape Architecture
Abstract/Contents:"Ethephon is commonly tank-mixed with trinexapac-ethyl (TE) and applied to putting greens in spring to manage annual bluegrass (Poa annua L.) seedheads. Previous research has shown that ethephon can cause stem elongation in Kentucky bluegrass (Poa pratensis L.), which can predispose turf to scalping. It therefore would be prudent to determine if ethephon has similar effects on creeping bentgrass (Agrostis stolonifera L.) grown on putting greens. This study was conducted on a mature stand of 'Providence' creeping bentgrass grown on a USGA specified, sand-based rootzone. In 2007, ethephon (3.4 lb ai/A) and TE (0.04 lb ai/A) were applied alone or in tank-mix combination either once (20 April) or twice (20 April and 7 May). The same rates were evaluated in 2008 and the treatments were ethephon alone and ethephon + TE applied either once (18 April) or twice (18 April and 7 May); ethephon + TE applied twice on 18 April and 7 May, and an additional three applications of TE were appled to these plots on 25 May and 5 and 18 June (i.e., ethephon + TE 5 times); TE alone applied five times on a two week interval from 18 April to 18 June; and an untreated control. Turf was mowed five times weekly to a height of 0.156 inches. The site received between 1.5 and 1.75 lb N 1000ft2 from water soluble N sources between early April and late May in 2007 and 2008. The site was irrigated as needed to prevent wilt. The plant growth regulators (PGR's) were applied in 50 GPA with a CO2 pressurized backpack sprayer equipped with an 8004 flat fan nozzle. Plots were 5 ft by 5 ft and arranged in a randomized complete block with four replications. Turfgrass quality and scalping were assessed visually. Data were subjected to the analysis of variance and significantly different means were separated by Fisher's protected least significant difference test at P≤ 0.05. Two applications of ethephon alone or tank-mixed with TE resulted in significant scalping that persisted from 36 (2007) to 55 (2008) days. Scalping first became evident on a consistent basis in early June between 30 (2008) and 37 (2007) days following the second application of ethephon. Little or no scalping was observed in TE-treated or untreated plots in either year. Close visual examination revealed that ethephon had caused a distortion in normal shoot development as a result of abnormal elongation of axillary buds. As a result of scalping elicited by ethephon there was a subsequent reduction in turf quality. Plots treated once with ethephon + TE did not exhibit reduced quality in 2007, but reduced quality was observed in midlate June 2008. Quality was reduced to a greater extent and for a longer period in plots treated twice with ethephon + TE in 2008 versus 2007. In 2008, quality ratings from plots treated twice with ethephon + TE were reduced to unacceptable levels on most rating dates after mid-June. Plots treated with ethephon + TE 5 times exhibited quality that was unacceptable for only two weeks in June; however, quality was reduced by this treatment versus the control on all dates between mid-June and early August. It is important to note that this study was conducted on a research green where normal inputs of nitrogen and continued use of PGR's was not sustained throughout the study period, which may have impacted results."
See Also:See also closely related 2009 article "Scalping and creeping bentgrass quality as influenced by ethephon and trinexapac-ethyl" Applied Turfgrass Science, June 1 2009, p. 1-7 R=149463 R=149463

See also closely related 2010 article "PGRs and scalping in creeping bentgrass: Scalping in creeping bentgrass may not occur until a month or more after Proxy has been applied twice to the turf" Golf Course Management, 78(1) January 2010, p. 113-116, 118 R=159264 R=159264
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Pigati, R. L., and P. H. Dernoeden. 2008. Creeping bentgrass scalping and quality as influenced by ethephon and trinexapac-ethyl. Turfgrass Pathol. Weed Sci. Res. Sum. p. 70.
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