Full TGIF Record # 97757
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Web URL(s):https://journals.ashs.org/hortsci/view/journals/hortsci/38/4/article-p607.xml?rskey=FZePqV
    Last checked: 11/19/2019
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Author(s):Dernoeden, Peter H.; Bigelow, Cale A.; Kaminski, John E.; Krouse, John M.
Author Affiliation:Department of Natural Resource Sciences and Landscape Architecture, University of Maryland, College Park, Maryland
Title:Smooth crabgrass control in perennial ryegrass and creeping bentgrass tolerance to quinclorac
Section:Turf management
Other records with the "Turf management" Section
Source:HortScience. Vol. 38, No. 4, July 2003, p. 607-612.
# of Pages:6
Publishing Information:Alexandria, VA: American Society for Horticultural Science
Keywords:TIC Keywords: Digitaria ischaemum; Lolium perenne; Agrostis stolonifera; Quinclorac; Weed Control; Turf discoloration; Postemergence herbicides; Cool season turfgrasses; Crabgrass control
Cultivar Names:Penncross; Crenshaw; L-93
Abstract/Contents:"Smooth crabgrass [Digitaria ischaemum (Schreber) Schreber ex Muhlenb.] is an invasive weed of cool-season turfgrasses. Previous research has demonstrated that quinclorac is an effective postemergence herbicide for crabgrass control, but performance has been erratic in some regions. Furthermore, quinclorac may elicit objectionable levels of discoloration in creeping bentgrass (Agrostis stolonifera L.). The objectives of this 3-year field study were to determine optimum rates and timings of quinclorac applications that provide consistent levels of effective crabgrass control and to assess creeping bentgrass quality responses to quinclorac. To evaluate crabgrass control, quinclorac was applied in early-, mid- and late-postemergence timings at various rates to perennial ryegrass (Lolium perenne L.) turf. Similar treatments were applied to creeping bentgrass to determine if application timing and rate influenced the level and duration of discoloration. Quinclorac was applied alone or was tank-mixed with either urea (N at 6.1 kg*ha-1) or chelated iron (Fe)+nitrogen (N) (FeSO4 at 1.1 kg*ha-1+N at 2.2 Kg*ha-1) to determine if they would mask discoloration. Crabgrass control generally was more effective in the early- and mid-postemergence application timings. A single application of quinclorac (0.84 kg*ha-1) was effective where crabgrass levels were moderate, but sequential (i.e. multiple) applications were required where crabgrass levels were severe. The most consistent level of crabgrass control where weed pressure was severe occurred with three, sequential quinclorac (0.37 or 0.42 kg*ha-1) applications. Creeping bentgrass exhibited 2 to 11 weeks of unacceptable discoloration in response to sequential quinclorac applications. Chelated Fe+N was more effective than urea in masking discoloration. In general, chelated Fe+N tank-mixed with quinclorac masked discoloration and turf had quality equivalent to untreated bentgrass on most, but not all rating dates."
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Dernoeden, P. H, C. A. Bigelow, J. E. Kaminski, and J. M. Krouse. 2003. Smooth crabgrass control in perennial ryegrass and creeping bentgrass tolerance to quinclorac. HortScience. 38(4):p. 607-612.
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DOI: 10.21273/HORTSCI.38.4.607
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    Last checked: 11/19/2019
    Requires: PDF Reader
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MSU catalog number: SB 1 .H64
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