Full TGIF Record # 63535
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Publication Type:
i
Report
Content Type:Abstract or Summary only
Author(s):Taylor, J. M.; Coats, G. E.
Author Affiliation:Mississippi State University, Mississippe Stati, MS 39762
Title:Comparison of johnsongrass weed control programs applied before or after mowing in highway rights-of-way
Section:Vegetation management in utility, railroad and highway right-of-ways, and on industrial sites
Other records with the "Vegetation management in utility, railroad and highway right-of-ways, and on industrial sites" Section
Meeting Info.:52nd Annual Meeting, Greensboro, NC, January 25-27, 1999
Source:Southern Weed Science Society Proceedings. Vol. 52, 1999, p. 151-152.
Publishing Information:Champaign, IL: Southern Weed Science Society.
# of Pages:2
Keywords:TIC Keywords: Sorghum halepense; Roadsides; Weed control; Herbicides; Herbicide evaluation; Cynodon dactylon; Mowing height; Application rates; Tank mix; Imazapic; Application timing; Glyphosate; MSMA; Setaria parviflora; Digitaria ciliaris; Sulfometuron; Paspalum notatum
Geographic Terms:Mississippi
Abstract/Contents:"Johnsongrass [Sorghum halepense(L.) Pers] is a common weed found along roadsides in Mississippi. Typically, growth is sufficient to warrant mowing by late May or early June. Experiments were conducted in 1998 to evaluate herbicide treatments for johnsongrass control to coincide with mowing. Treatments were applied 2 wk before or 2 wk after mowing. Experiment 1. All treatments were applied to separate bermudagrass [Cynodon dactylon (L.) Pers.] plots on May 19 and June 16 and all plots were mowed to a height of 6 in on June 3. Treatmens were: 1.33 oz pr/A MON 37500; 1.0 oz pr/A sulfometuron; or 8 fl oz/A imazapic applied alone or tank-mixed with 3.3 lb ai/A MSMA or 12fl oz/A glyphosate. In addition, MSMA or glyphosate was applied alone. Averaged over application timing at 12 wk after treatment (WAT), MON 37500 controlled johnsongrass 89%, which was better than control with either imazapic or sulfometuron (74 to 77%). Glyphosate or MSMA controlled johnsongrass 36% or less while all tank-mixes controlled johnsongrass 84 to 89%. MON 37500 alone, before or after mowing, controlled knotroot foxtail [Setaria geniculata(Lam.) Beauv.] 18% or less 12 WAT. MON 37500 tank-mixed with MSMA or glyphosate controlled knotroot foxtail 35% or less when applied before mowing and 60 to 68% when applied after mowing. Sulfometuron alone or tank-mixed with MSMA or glyphostate controlled knotroot foxtail 60 to 77% when applied before mowing and 85 to 90% when applied after mowing. Knotroot foxtail was controlled 80 to 90% by imazapic applied alone or tank-mixed with glyphosate or MSMA regardless of application timing. MON 37500 controlled southern crabgrass [Digitaria ciliaris (Retz.) Koel.] 83% 12 WAT when applied before mowing and 8% when applied after mowing. Southern crabgrass control was reduced to 63% when glyphosate was added to MON 37500 applied before mowing. MON 37500 plus glyphosate controlled southern crabgrass 75% when applied after mowing, and MON 37500 plus MSMA controlled southern crabgrass 85 to 90% when applied at either application timing. Sulfometron controlled southeren crabgrass 74% when applied before mowing and all other treatments containing sulfometuron controlled southern crabgrass 88 to 90%. All treatments containing imazapic controlled southern crabgrass 80 to 90%. Averaged over application timing, MON 37500 resulted in greater density of bermudagrass at 4 WAT than any treatment containing sulfometuron or imazapic. Bermudagrass density was 29% following MON 37500 at 4 WAt compared to 15 and 16%, respectively, for sulfometuron and imazapic. Increased bermudagrass density was observed 8 or 12 WAT when MSMA was added to MON 37500 plus MSMA. At 12 WAT MON 37500 plus MSMA resulted in 56% bermudagrass density while MON 37500 resulted in 40% density. MSMA also increased bermudagrass density when added to imazapic compared to imazapic or MSMA applied alone. Bermudagrass density 12 WAT for imazapic, MSMA, and imazapic plus MSMA was 39, 38, and 55 % respectively . EXperiment 2. All treatments were applied to separate bahiagrass (Paspalum notatum Fluegge) plots on May 15 and June 23 and all plots were mowed to a height of 4 in on June 4. Treatments were: 1.33 oz pr/A MON 37500, 0.5 oz pr/A sulfometuron, 4 fl oz/A imazapic, or 17 fl oz/A clethodim. At 12 WAT MON 37500 controlled johnsongrass 90% regardless of application date. Sulfometuron, imazapic, or clethodim controlled johnsongrass better when applied after mowing compared to before mowing treatments. When applied after mowing these treatments controlled johnsongrass 75 to 80% compared to 30 to 53% when applied before mowing."
Language:English
References:0
See Also:Other items relating to: M S M A
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Taylor, J. M., and G. E. Coats. 1999. Comparison of johnsongrass weed control programs applied before or after mowing in highway rights-of-way. South. Weed Sci. Soc. Proc. 52:p. 151-152.
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