Full TGIF Record # 231140
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Web URL(s):http://www.wsweedscience.org//wp-content/uploads/proceedings-archive/2013.pdf#page=73
    Last checked: 12/20/2013
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Author(s):Peterson, Vanelle F.; Breuninger, James M.; Loughner, Daniel D.; Alexander, Anita L.; Lees, Mike D.; Brosnan, James T.; Breeden, Gregory K.; Brecke, Barry; Leon, Ramon; McElroy, Scott; Flessner, Michael
Author Affiliation:Peterson, Breuninger, Loughner, Alexander, Lees: Dow AgroSciences; Peterson: Mulino, OR; Breuninger: Indianapolis, IN; Loughner: Lawrenceville, NJ; Alexander: Lawrenceville, GA; Lees: Grante Bay, CA; Brosnan and Breeden: University of Tennesee, Knoxville, TN; Brecke: University of Florida, Milton, FL; Leon: University of Florida, Jay, FL; McElroy: Auburn University, Auburn, AL
Title:Dithiopyr: New developments for post emergent crabgrass control in the western and southern U.S.
Section:Weeds of horticultural crops
Other records with the "Weeds of horticultural crops" Section
Meeting Info.:San Diego, California: March 11-14 2013
Source:Western Society of Weed Science Annual Meeting 2013. Vol. 66, 2013, p. 73-74.
# of Pages:2
Publishing Information:Las Cruces, New Mexico: Western Society of Weed Science
Keywords:TIC Keywords: Application timing; Digitaria ciliaris; Digitaria ischaemum; Dithiopyr; Herbicide evaluation; Postemergence weed control; Preemergence herbicides; Research
Trade Names:Dimension 2EW
Abstract/Contents:"Dithiopyr (Dimension¬ģ 2EW) is a member of the pyridinecarboxylic acid family of herbicides and controls annual grasses, especially crabgrass (Digitaria spp.), and several small-seeded annual broadleaf weeds in established lawns, commercial sod farms, non-cropland and industrial sites, ornamental turf, and container, field-grown, and landscape ornamentals. The current label allows for use on crabgrass at early post emergence: "Early postemergence applications of this product will control crabgrass only if applied prior to the fifth leaf (first tiller) stage of growth. The addition of a nonionic surfactant at 0.5% by volume (2 qt per 100 gallons of spray) may improve early postemergence control." Research was conducted from 2010 through 2012 in CA, FL, AL, and TN to establish the potential for post emergent control of crabgrass past the fifth leaf stage and the need for a surfactant with those applications. Experiments were designed as randomized complete blocks with 4 replications per treatment. Broadcast applications were made with a CO2 backpack sprayer at 80 or 86 GPA on 5 by 10 ft plots. At 4 sites in CA in 2010 and 2011, dithiopyr at 0.5 lbs ai/A provided excellent crabgrass control (93%) 6 to 10 weeks after post emergent applications to 1 to 3 tiller crabgrass in bermudagrass turf. In 2012, all sites were bermudagrass (Cynodon dactylon) or a bermudagrass and fescue (Fescue spp.) mix (CA) Treatments were dithiopyr at 0.5 lb ai/A with and without 0.25% v/v non-ionic surfactant, MSMA at 2 lb ai/A with 0.25% v/v non-ionic surfactant, and quinclorac at 0.75 lb ai/A (as Drive XLR8) with 1.5 pints product/A crop oil concentrate. Applications were made on crabgrass (Digitaris adscendens in AL, and D. Ischaemum in CA, TN and FL) before tillering, 1 to 2 tiller or 3 to 5 tiller. Percent visual cover and control evaluations of crabgrass were made at 3 to 5, 6 to 10 and 11 to 14 weeks after each application timing. Results from sites were combined and analyzed using general linear mixed model techniques and Tukey's mean comparison test (P=0.05). At 11 to 14 weeks after application, control of crabgrass was excellent with dithiopyr applied with or without a non-ionic surfactant before tillering (97% for both 74 treatments) and 1 to 2 tiller (85 or 87%). Quinclorac and MSMA gave 50% control or less at these 2 timings. At the 3 to 5 tiller stage crabgrass control with dithiopyr with a surfactant (58%) was better than without the surfactant (37%), quinclorac (31%) or MSMA (30%). A surfactant was not necessary when dithiopyr was applied before tillering or 1 to 2 tiller stages. Dithiopyr, labeled for selective use in all major turf grass species, gave superior post emergence control of crabgrass than quinclorac or MSMA, which have limited tolerance in key turf grass species. New label wording is being considered for the Dimension 2EW label to expand the window for post emergent crabgrass control in bermudagrass and turfgrasses."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Peterson, V. F., J. M. Breuninger, D. D. Loughner, A. L. Alexander, M. D. Lees, J. T. Brosnan, et al. 2013. Dithiopyr: New developments for post emergent crabgrass control in the western and southern U.S.. Proc. West. Soc. Weed Sci. 66:p. 73-74.
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