Full TGIF Record # 85903
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Web URL(s):http://usgatero.msu.edu/v02/n08.pdf
    Last checked: 4/2003
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Publication Type:
i
Report
Author(s):Dernoeden, Peter; Bigelow, Cale; Kaminski, John E.; Krouse, John
Author Affiliation:Dernoeden: Professor, Department of Natural Resource Sciences and Landscape Architecture, University of Maryland, Maryland; Bigelow: Assistant Professor, Agronomy, Purdue University, West Lafayette, Indiana; Kaminski: PhD Candidate, Department of Natural Resource Sciences and Landscape Architecture, University of Maryland, Maryland; and Krouse: Research Associate, Department of Natural Resource Sciences and Landscape Architecture, University of Maryland, Maryland
Title:Smooth crabgrass control and creeping bentgrass tolerance to Quinclorac (Drive®)
Source:USGA Turfgrass and Environmental Research Online. Vol. 2, No. 8, April 15 2003, p. [1-13].
Publishing Information:Far Hills, NJ: United States Golf Association, Green Section
# of Pages:13
Keywords:TIC Keywords: Golf courses; Golf fairways; Digitaria ischaemum; Crabgrass control; Agrostis stolonifera; Herbicide resistance; Quinclorac; Application rates; Application frequency; Tank mix; Iron chelates; Micronutrients; Discoloration
Trade Names:Drive
Abstract/Contents:"Creeping bentgrass (Agrostis stolonifera L.) is a major turfgrass species grown on fairways in the transition zone and northern regions of the U.S. Crabgrass (Digitaria spp.) is among the most common and invasive weeds of turfgrass. There are few herbicides labeled for post-emergence crabgrass control in creeping bentgrass. In 1999, the postemergence herbicide quinclorac was registered for use on bentgrass fairways. Preliminary research conducted in the transitional zone climate of Maryland showed that quinclorac provided erratic levels of crabgrass control and could elicit objectionable levels of discoloration in bentgrass for 50 days or longer. This research was conducted to determine safe and effective use rates for quinclorac on bentgrass fairway turf. Findings include: Smooth crabgrass control was best achieved by beginning quinclorac applications in mid-to-late June before tillering of crabgrass. A single application (0.75 lb ai/A) effectively controlled crabgrass where weed pressure was low to moderately severe. Where dense stands of crabgrass were present, two (0.5 + 0.5 lb ai/A applied on a two week interval) or three (0.33 + 0.33 + 0.33 lb ai/A applied on a two week interval) applications of quinclorac were required to achieve effective crabgrass control. A single application of quinclorac (0.75 lb ai/A) discolored bentgrass for 1 to 2 weeks. Two or more applications (0.33 or 0.5 lb ai/A) discolored bentgrass for eight weeks or longer. Tank-mixing quinclorac with a chelated iron plus micronutrient product helped to mask quinclorac-induced discoloration, but it did not eliminate discoloration."
Language:English
References:7
See Also:Other Reports from this USGA research project: 2000-23-191
Note:Pictures, color
Tables
Summary as abstract
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Dernoeden, P., C. Bigelow, J. E. Kaminski, and J. Krouse. 2003. Smooth crabgrass control and creeping bentgrass tolerance to Quinclorac (Drive®). USGA Turfgrass Environ. Res. Online. 2(8):p. [1-13].
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http://usgatero.msu.edu/v02/n08.pdf
    Last checked: 4/2003
    Requires: PDF Reader
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MSU catalog number: SB 433 .A1 A65 [online]
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