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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Higingbottom, J. K.;
McCarty, L. B.;
Bunnell, B. T. |
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| Author Affiliation: | Clemson University, Horticulture Department, Clemson SC |
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| Title: | Tank mixing envoy (Clethodim) and reward (Diquat) for postemergence annual bluegrass (Poa annua) control |
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| Section: | Weed management in turf, pastures and rangeland
Other records with the "Weed management in turf, pastures and rangeland" Section
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| Meeting Info.: | 52nd Annual Meeting, Greensboro, NC, January 25-27, 1999 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 52, 1999, p. 71. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Tank mix; Clethodim; Diquat; Postemergence herbicides; Poa annua control; Poa annua; Cynodon dactylon; Golf rough; Application rates; Application timing; Atrazine; Surfactants; Thiram; Glyphosate; Glufosinate; Spring green-up; Herbicide evaluation
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| Abstract/Contents: | "Annual bluegrass (Poa annua) is one of the most common winter annual, grass weeds in dormant bermudagrass (Cynodon dactylon). It predominately germinates in the fall and produces undesirable seedheads throughout the winter and spring months. The objective of our research was to determine the efficacy of different herbicides and tank mixes in controlling established (Poa annua) in dormant bermudagrass. Research was conducted on dormant common bermudagrass rough infested in mature, annual bluegrass located in Pendleton, SC. Treatments were applied with a CO₂ backpack sprayer calibrated at 30 GPA with 8003 flat fan tips. Plots were 5ft. by 10ft. using a randomized complete block experimental design replicated 3 times. All treatments were applied on February 5, 1998. Poa annua was rated for percent burn for the first week and percent control for subsequent weeks on a 0-100% scale while bermudagrass was rated for percent green-up. Singular treatments included atrazine (1.0 lb ai/A), diquat (2.0 pt/A)+Optima surfactant (0.25% v/v), clethodim (34.0 oz/A)+Dash crop oil (1.0% v/v), clethodim (34.0)+Optima surfactant (0.25), glyphosate (0.5 lb ai/A), and glufosinate (6.0qt/A). Tank mix treatments were clethodim (34.0) + diquat (0.5); glyphosate (0.5) + diquat (0.5), glyphosate (0.5) + clethodim (34.0), glyphosate (0.5) + glufosinate (6.0), and glufonsinate (6.0) + clethodim (34.0). Clethodim tank mixes contained Optima surfactant at 0.25% v/v except for those with glyphosate. Diquat treatments provided quick burn-down (60%) within three days after treatment. At 1 WAT (week after treatment), diquat plus clethodim had 83% burn followed by diquat alone and diquat + glyphosate at ≅72%burn. Excellent control (95%) followed the application of diquat + clethodim at 3 WAT. Additionally at 3 WAT, the glufosinate treatments provided significant control (≅70%). By 5 WAT, treatments containing glufosinate and diquat + clethodim showed 95% control while diquat and diquat + glyphosate started declining in control. Excellent residual control (≥98%) followed diquat + clethodim and all glufosinate treatments at 7 WAT. Clethodim alone provided ≅70% control. Glyphosate and glyphosate + clethodim first exhibited acceptable control (≅80%) at 7 WAT. Clethodim alone, diquat + clethodim, and all treatments with glufosinate all had 100% control by 9 WAT. Glyphosate provided 82% control at 9 WAT, which was considerably, less that the treatments listed above. Significant differences in green-up at 9 WAT wre not noted except for the clethodim + Dash treatment which had 13% green-up compared to 20% for the untreated. By 12 WAT green -up was unaffected among any treatments. For quick and long lasting Poa annua control, the diquat + clethodim tank mix had the best overall results followed by the glufosinate treatments, which showed similar control but took slightly longer to achieve. Atrazine, a standard product, never attained greater that 58% control". |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Higingbottom, J. K., L. B. McCarty, and B. T. Bunnell. 1999. Tank mixing envoy (Clethodim) and reward (Diquat) for postemergence annual bluegrass (Poa annua) control. South. Weed Sci. Soc. Proc. 52:p. 71. |
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MSU catalog number: SB 611 .S6 v.52 |
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