Full TGIF Record # 45210
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Web URL(s):http://www.newss.org/proceedings/proceedings_1998_vol52.pdf#page=104
    Last checked: 07/24/2013
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Publication Type:
i
Report
Author(s):Johnson, Jon M.; Spackman, Chad W.; Kuhns, Larry J.
Author Affiliation:Project Assistant, Research Technologist, and Professor of Ornamental Horticulture, respectively, The Pennsylvania State University, University Park, PA.
Title:Evaluation of R-6447 for total vegetation control
Section:Industry, forestry and conservation Wednesday-January 7, 1998
Other records with the "Industry, forestry and conservation Wednesday-January 7, 1998" Section
Meeting Info.:Washington, DC: January 5-8, 1998
Source:Proceedings of the 52nd Annual Meeting of the Northeastern Weed Science Society. Vol. 52, 1998, p. 104-105.
Publishing Information:College Park, MD: Northeastern Weed Science Society
# of Pages:2
Keywords:TIC Keywords: Ground cover; Herbicide application; Herbicide evaluation; Herbicide injury; Non-selective herbicides
Trade Names:R-6447
Abstract/Contents:"As part of an ongoing research project funded by the Pennsylvania Department of Transportation, a trial comparing total vegetation control provided by fall and spring applications of several herbicide combinations was established at the Landscape Management Research Center located at University Park, PA. The entire study area was initially sprayed on October 26, 1996 with 3 lb/ac glyphosate, 0.125% (v/v) QwikWet 357 surfactant, and 0.25% (v/v) Polytex A1001 drift control agent to control any existing vegetation. Both fall and spring treatments were applied to 6 by 10 ft plots. The fall applications were made on November 6, 1996; spring treatments were applied on May 7, 1997. 1.5 lb/ac glyphosate was included in all spring applied treatments, including the check plot for the spring applications, to control vegetation that had already emerged. The study was arranged in a randomized complete block design with a factorial treatment arrangement and three replications. The treatments were applied using a CO2-powered backpack sprayer equipped with a six-foot boom that contained four XR 8004 VS spray tips, delivering 40 GPA at 38 psi. Green cover ratings of weed species were taken for the fall and spring applications on July 10, August 5, and September 25, 1997. Predominant weed species were yellow woodsorrel (Oxalis stricta L.), quackgrass (Elytrigia repens (L.) nevski), yellow foxtail (Setaria glauca Weigel), and dandelion (Taraxacum officinale Webster). There was a significant interaction between time and treatment for all three rating dates. Therefore, fall and spring treatments applied are reported separately in Table 1. Five fall-applied treatments provided an acceptable level of control at the July 10 rating. All included at least 0.14 lb/ac sulfometuron methyl. Not even the highest rate of R-6447 provided any control on July 10 when fall applied. By the August 5 rating the only treatments providing acceptable control were those containing what is now the most commonly used combination by PennDOT, sulfometuron methyl plus diuron. None of the fall-applied treatments provided acceptable levels of control throughout the following growing season. Nine of the spring applied treatments provided excellent to acceptable season-long weed control. The combinations including sulfometuron methyl plus diuron, imazapyr plus diuron, sulfometuron methyl plus R-6447 at 0.17 lb/ac and a combination of sulfometuron methyl, R-6447, and diuron provided almost total control through the year. Sulfometuron methyl alone at 0.14 lb/ac and the combination of R-6447 with diuron at 6 or 7.5 lbs/ac, or metsulfuron methyl at 0.11 or 0.14 provided and [an] acceptable level of control throughout the year. The control provided by the R-6447 alone was totally rate and time dependent- the higher the rate the longer the control lasted, with even the highest rate providing poor control at the final rating. The results of this test again show that fall applications of these non-selective herbicide treatments do not provide enough residual activity to provide acceptable weed control through the following growing season. Spring applied combinations of the industry standards, metsulfuron methyl or imazapyr in combination with diuron have again been proven effective. Combinations of R-6447 with metsulfuron methyl and/or diuron were also proven effective in this study. Additonal tests with varying rates and on sites with coarser soils and different weed pressures should be done to determine how useful this product will ultimately be."
Language:English
References:0
Note:Table
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Johnson, J. M., C. W. Spackman, and L. J. Kuhns. 1998. Evaluation of R-6447 for total vegetation control. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 52:p. 104-105.
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Web URL(s):
http://www.newss.org/proceedings/proceedings_1998_vol52.pdf#page=104
    Last checked: 07/24/2013
    Requires: PDF Reader
    Notes: Item is within a single large file
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MSU catalog number: SB 610 .N62 v. 52
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