Full TGIF Record # 224574
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Web URL(s):http://www.swss.ws/wp-content/uploads/docs/2003%20Proceedings-SWSS.pdf#page=171
    Last checked: 07/15/2013
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Publication Type:
i
Report
Author(s):Askew, S. D.; Beam, J. B.; Barker, W. L.
Author Affiliation:Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute & State University, Blacksburg, VA
Title:New herbicide options for seeding cool-season turfgrass in spring
Section:Weed management in turf, pasture, and rangeland
Other records with the "Weed management in turf, pasture, and rangeland" Section
Meeting Info.:Houston, Texas: January 27-29, 2003
Source:Proceedings: Southern Weed Science Society: 56th Annual Meeting. Vol. 56, 2003, p. 85-86.
Publishing Information:Champaign, Illinois: Southern Weed Science Society
# of Pages:2
Keywords:TIC Keywords: Cool season turfgrasses; Herbicide efficacy; Herbicide evaluation; Seeding; Spring maintenance; Weed control
Abstract/Contents:"Weed control is the limiting factor for successfully establishing turfgrass in spring or early summer. Siduron has been the only marketed herbicide for weed control at planting of cool- season grasses such as tall fescue (Festuca arundinacea Schreb). Unfortunately, siduron does not control summer annual broadleaves and many grasses other than crabgrass (Digitaria spp.) and foxtails (Setaria spp.). Instructions on herbicide labels require that turfgrass producers wait until the second mowing before treating with most postemergence broadleaf herbicides. More herbicide options are needed for preemergence weed control to avoid weed competition during turfgrass seedling establishment. A field study was conducted between April and September 2002 at Blacksburg, VA to evaluate new and potential herbicide options for preemergence (PRE) and early postemergence (EPOST) weed control in spring-seeded tall fescue. The study was conducted as a randomized complete block with 9 treatments and four replications. Preemergence herbicides were applied on April 17, 2002 and Crossfire II turf-type tall fescue wa s seeded at 300 kg/ha on April 29, 2002. Early postemergence treatments were applied four weeks after planting (WAP) and late postemergence (LPOST) treatments were applied 10 WAP. A nontreated control was included for comparison. Treatments included mesotrione at 0.56 kg ai/ha PRE, mesotrione at 0.28 kg/ha PRE followed by (fb) mesotrione at 0.14 kg/ha EPOST, isoxaflutole at 0.56 kg ai/ha PRE, isoxaflutole at 0.28 kg/ha PRE fb isoxaflutole at 0.14 kg/ha EPOST, quinclorac at 0.84 kg ai/ha PRE, quinclorac at 0.84 kg/ha PRE fb quinclorac at 0.42 kg/ha EP OST, siduron at 6.72 kg ai/ha PRE, siduron at 3.36 kg/ha PRE fb siduron at 3.36 kg/ha EPOST, and siduron at 6.72 kg/ha PRE fb 2,4-D + dicamba + MCPP 61:6:33 (% by weight) at 1.70 kg ai/ha LPOST. Treatments were applied in 280 L/ha spray solution and nonionic surfactant at 0.25% (v/v) was included in postemergence treatments of mesotrione and isoxaflutole while crop oil concentrate at 1% (v/v) was included with postemergence treatments of quinclorac. At 4 WAP, all treatments controlled smooth crabgrass [Diqitaria [Digitaria] ischaemum (Schreb. ex Schweig.) Schreb] at least 98% except siduron at 3.36 kg/ha PRE (85%) and mesotrione at 0.28 kg/ha PRE (70%). Mesotrione and isoxaflutole treatments completely controlled common lambsquarters (Chenopodium album L.), henbit (Lamium Amplexicaule L.), broadleaf plantain (Plantago major L.), and yellow woodsorrel (Oxalis stricta L.). Quinclorac controlled common lambsquarters at least 90%, henbit at least 75%, and seedling broadleaf plantain at least 70%. Quinclorac did not control yellow woodsorrel. Siduron did not control broadleaf weeds. At 22 WAP, sequential treatments of mesotrione or isoxaflutole and either treatment of quinclorac controlled smooth crabgrass at least 90%. Siduron and single treatments of mesotrione or isoxaflutole controlled smooth crabgrass 60 to 70%. Mesotrione and isoxaflutole controlled all broadleaf weeds and quinclorac controlled only common lambsquarters. Siduron did not control broadleaf weeds unless fb 2,4-D + dicamba + MCPP. Midseason turfgrass coverage was highest when treated with mesotrione and isoxaflutole (>90%). Turfgrass coverage following quinclorac or siduron treatment was 55 to 75% and equivalent. Based on estimates from one supplier, chemical cost of siduron systems were twice that of quinclorac systems. These data indicate that quinclorac is comparable or better than siduron for PRE smooth crabgrass and broadleaf weed control in spring-seeded fescue. Both mesotrione and isoxaflutole control weeds and improve turfgrass cover better than either quinclorac or siduron when used at seeding. Mesotrione, isoxaflutole, and quinclorac perform better when applied as sequential treatments. However, siduron should be applied at a full rate rather than in split treatments."
Language:English
References:0
Note:"Invasive weeds: Real or imagined threat?"
This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Askew, S. D., J. B. Beam, and W. L. Barker. 2003. New herbicide options for seeding cool-season turfgrass in spring. South. Weed Sci. Soc. Proc. 56:p. 85-86.
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http://www.swss.ws/wp-content/uploads/docs/2003%20Proceedings-SWSS.pdf#page=171
    Last checked: 07/15/2013
    Requires: PDF Reader
    Notes: Item is within a single large file
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