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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Weinbrecht, J. S.;
Miller, G. L.;
McCarty, L. B. |
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| Author Affiliation: | Weinbrecht and Miller; Environmental Horticulture Department, University of Florida, Gainesville. McCarty; Department of Horticulture, Clemson University, Clemson, SC |
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| Title: | St. Augustinegrass (Stenotaphrum secundatum) tolerance and selective grassy-weed control with exp 31130A |
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| Meeting Info.: | 51st Annual Meeting, Birmingham, AL, January 26-28, 1998 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 51, 1998, p. 67. |
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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: Experimental products; Stenotaphrum secundatum; Postemergence herbicides; Herbicide resistance; Variety trials; Weed control; Application frequency; Asulam; Cultivar variation; Digitaria serotina; Digitaria ciliaris; Application timing; Cynodon dactylon
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| Cultivar Names: | Floratum; Raleigh; Delmar; Palmetto |
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| Abstract/Contents: | "Due to its environmental, agronomic, and cultural adaptations, St. Augustinegrass (Stenotaphrum secundatum) is a popular warm-season turfgrass used extensively in the gulf-coast region of the southern United States. One of the most significant challenges associated with St. Augustinegrass management is the limited availability of safe and effective postemergence herbicides. This is particularly true in the case of postemergence graminicides, as asulam is the only material to provide relatively safe and effective grassy-weed control. An additional challenge with asulam is the label limitation of one application per growing season. A series of trials over three growing seasons and three locations were conducted under sod production ocnditions. Evaluations focused on tolerance of four popular St. Augustinegrass cultivars ('Floratam', 'Raleigh, 'Delmar', and Palmetto'), and grassy-weed efficacy following postemergence applications of EXP 31130A. The experimental compound was as a single 0.36 lb/A, and a split 0.18 lb/A fb 0.18 lb/A at a six week interval Asulam at 2.1 lb/A was included as a standard comparison. St Augustinegrass cultivar tolerance to EXP 31130A varied. "Floratam consistently demonstrated good (≥ 7.9) tolerance on a 0-10 scale where 10=best turf quality and 5.0 is considered minimally acceptable. Conversely, 'Raleigh', 'Delmar', and 'Palmetto' demonstrated severe injury (≅ 3.5) two weeks following initial application, with injury remaining evident for eight weeks or longer. Response to asulam was marginally acceptable (6.3-7.0) for at least 3 weeks following initial application across all cultivars evaluated. Due to turf tolerance and relative efficacy, 'Floratam' St. Augustinegrass stand density increased ≥ 98% at eight weeks following either EXP 31130A treatment, while asulam averaged a 40% increase in stand density. Stand density in the untreated plots declined by an average 31% as a result of uncontrolled encroachment of competitive grassy-weeds. Unacceptable control was evident with asulam at six weeks following initial application when applied to blanket crabgrass (Digitaria serotina) (59%) an sothern crabgrass (Digitaria ciliaris) (≤ 30%) in the flowering stage. However, excellent blanket crabgrass control (90%) was observed when asulam was applied at the 7-10 leaf stage, and prior to flowereing. At any stage of plant development, either EXP 31130A treatment application provided >90% blanket and southern crabgrass control eight weeks following initial application. However, when mowing was infrequent and weed canopy excedded 5.0 cm, best control (˜70%) was observed following EXP 31130A at 0.36 lb/A was at six weeks following application. Best selective common bermudagrass (Cynodon dactylon) control in 'Floratam' St. Augustinegrass was evident only following three to four late-summer/early-fall postemergence EXP 31130A applications at 0.36 lb/A sequentially applied at three-week intervals. Better than 88% control was evident following either of these treatments sexteen weeks after an initial mid-July application." |
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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):
Weinbrecht, J. S., G. L. Miller, and L. B. McCarty. 1998. St. Augustinegrass (Stenotaphrum secundatum) tolerance and selective grassy-weed control with exp 31130A. South. Weed Sci. Soc. Proc. 51:p. 67. |
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MSU catalog number: SB 611 .S6 v.51 |
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