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Web URL(s):http://www.swss.ws/wp-content/uploads/docs/2010 Proceedings-SWSS.pdf#page=97
    Last checked: 07/31/2013
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i
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Author(s):Breeden, G. K.; Brosnan, J. T.; McCullough, P. E.
Author Affiliation:Breeden and Brosnan: University of Tennessee, Knoxville, TN; McCullough: University of Georgia, Griffin, GA
Title:Control of smooth crabgrass (Digitaria ischaemum) with two formulations of dithiopyr at various stages of growth
Section:Posters
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Meeting Info.:Little Rock, Arkansas: January 25-27, 2010
Source:2010 Proceedings, Southern Weed Science Society. Vol. 63, 2010, p. 47.
# of Pages:1
Publishing Information:Champaign, Illinois: Southern Weed Science Society
Keywords:TIC Keywords: Application methods; Cynodon dactylon; Digitaria ischaemum; Dithiopyr; Herbicide evaluation; Preemergence weed control
Abstract/Contents:"Smooth crabgrass (Digitaria ischaemum) is an annual grassy weedy of both warm and cool-season turf. While preemergence herbicides are commonly used for smooth crabgrass control, dithiopyr is a preemergence herbicide that has been reported to have postemergence activity against smooth crabgrass. Data describing the efficacy of dithiopyr for postemergence smooth crabgrass control are limited. Field research was initiated in the spring of 2009 in Knoxville, TN and Griffin, GA to evaluate the efficacy of dithiopyr for smooth crabgrass control at various stages of growth. Research was conducted on mature bermudagrass (Cynodon dactylon) fairways at the East Tennessee Research and Education Center in Knoxville, TN and the University of Georgia Experiment Station in Griffin, GA. Plots (1.5 by 3 m) were arranged in a randomized complete block design with three replications. Herbicide treatments included dithiopyr 2EW (560 g ai/ha) and dithiopyr 40WP (560 g ai/ha) applied at the preemergence (PRE), 1-2 leaf, 1 tiller, and 3+ tiller stages of growth. These treatments were compared to quinclorac (840 g ai/ha) applied at the 1-2 leaf, 1 tiller, and 3+ tiller stages of growth. Dithiopyr treatments were delivered without a surfactant, while all quinclorac treatments were delivered with a methylated seed oil surfactant at 1.5 L/ha. Treatments were applied with a CO2 powered boom sprayer calibrated to deliver 281 L/ha at the Knoxville location and 374 L/ha at the Griffin location. Weed control and turf injury were evaluated visually utilizing a 0 (no weed control or turf injury) to 100 (complete weed control or turf injury) % scale, relative to an untreated control. Data were collected every 2 weeks after each application (WAA). At both locations, all PRE dithiopyr treatments controlled smooth crabgrass >90% on all rating dates. Similarly, all treatments applied in Knoxville and Griffin at the 1-2 leaf stage controlled smooth crabgrass >=86% from 4 WAA through the end of the study. In Knoxville, all treatments applied at the 1 tiller stage controlled smooth crabgrass >=88% from 4 WAA through the end of the study, while all dithiopyr treatments applied at the 1 tiller stage in Griffin controlled smooth crabgrass 70% (EW) and 84% (WP) at 4 WAA, and 81% to 86% at 8 WAA. Comparatively, quinclorac applied at the same growth stage controlled smooth crabgrass >=98% at 4 WAA through the end of the study in Griffin. At the 3+ tiller stage in Knoxville, dithiopyr controlled smooth crabgrass 85% (WP) and 88% (EW) at 4 WAA, compared to 99% following treatment with quinclorac at the same growth stage; however, control with quinclorac applications at the 3+ tiller stage decreased to <70% by the end of the study in Knoxville. In Griffin, all treatments applied at the 3+ tiller growth stage controlled smooth crabgrass >=81% at 4 WAA, except dithiopyr 40WP (51%). At both locations, all dithiopyr treatments applied at the 3+ tiller stage controlled smooth crabgrass <=70% at 10 WAA. These data suggest applications of dithiopyr at 0.5 lb ai/a can provide postemergence control of crabgrass up to the 1 tiller stage of growth."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Breeden, G. K., J. T. Brosnan, and P. E. McCullough. 2010. Control of smooth crabgrass (Digitaria ischaemum) with two formulations of dithiopyr at various stages of growth. South. Weed Sci. Soc. Proc. 63:p. 47.
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http://www.swss.ws/wp-content/uploads/docs/2010 Proceedings-SWSS.pdf#page=97
    Last checked: 07/31/2013
    Requires: PDF Reader
    Notes: Item is within a single large file
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