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Web URL(s): | http://www.newss.org/proceedings/proceedings_2005.pdf#page=120 Last checked: 07/22/2013 Requires: PDF Reader Notes: Item is within a single large file |
Publication Type:
| Report |
Content Type: | Abstract or Summary only |
Author(s): | Askew, S. D.;
Willis, J. B.;
Ricker, D. B.;
McCall, D. S. |
Author Affiliation: | Virginia Tech, Blacksburg, VA |
Title: | Microstegium viminrum seedhead suppression with chemicals and effects on surrounding vegetation |
Section: | Turfgrass and plant growth regulators Other records with the "Turfgrass and plant growth regulators" Section
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Meeting Info.: | Capital Hilton, Washington, D.C.: January 3-6, 2005 |
Source: | Proceedings: NortheasternWeed Science Society. Vol. 59, 2005, p. 106. |
Publishing Information: | Ithaca, NY: Northeastern Weed Science Society |
# of Pages: | 1 |
Keywords: | TIC Keywords: Herbicide evaluation; Microstegium vimineum; Seedhead inhibition; Herbicide injury; Postemergence weed control; Application timing; Cover
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Abstract/Contents: | Japanese stiltgrass (Microstegium vimineum) (JSG) relies on seed production for continual infestation of invaded areas. JSG control is often stifled by negative impacts on surrounding vegetation. Reports on JSG seed viability in soil range from 3 to 7 years. Recent studies suggest that most seed germinate in the first year after production. Thus, sustained seedhead control should quickly reduce population levels and make overall management easier. Several researchers have investigated postemergence herbicides for JSG control but few studies have evaluated seedhead suppression with treatments that have minimal impact on surrounding vegetation. Our objective was to evaluate plant growth regulators used in the turfgrass industry for seedhead suppression and low rates of common herbicides to achieve maximum JSG seedhead redection with minimal injury to surrounding grass and broadleaf plants. Studies were conducted at two sites in 2004; one near Floyd, VA and the other near Blacksburg, VA. Randomized complete block experiments were established with 12 postemergence chemical treatments applied at various rates and timings prior to JSG seedhead production. Treatments included a 2 x 3 factorial arrangement of application timings (August 13 and 30) and chemicals (glyphosate at 0.1 lb ai/A, ethephon and mefluidide (both PGRs used in the turfgrass industry for seedhead suppression) at 2.0 lb ai/A and 0.07 lb ai/A, respectively). Additional treatments included imazapic at 0.09 lb ai/A, fluazifop at 0.05 lb ai/A, glyphosate at 0.25 lb ai/A, ethephon at 3.3 lb ai/A and mefluidide at 0.14 lb ai/A all applied on August 30. A nontreated control was included for comparision. Initial JSG ground cover on August 13 was 63 to 88% in Blacksburg and 68 to 97% in Floyd and differences between plots were not significant. At Blacksburg, replicate 1 was located along a wood edge and replicates 2 and 3 were located inside a forest canopy. At Floyd, all replicates were located along a wood edge. When JSG was located along the wood edge and exposed to partial sunlight, plants began to produce seedheads sooner than plants inside the forest canopy. Many plants had already started to produce seedheads on August 30 at the time of late chemical treatment. To assess the ability of chemicals to arrest seedhead development, 15 panicles were collected from each plot and length from flag leaf to tip was measured. In addition, 100 seed weight was determined and total seed per 15 panicles was enumerated. Subsequent seed germination response will be measured after a 90-day incubation period. When applied on August 13, mefluidide and glyphosate eliminated seedhead production. Only 1% of ethephon-treated JSG plants produced seedheads compared to 95% seedhead production by control plants on September 24. Only glyphosate completely eliminated seedhead production when applied on August 30. Ethephon, mefluidide, imazapic, and fluazifop all decreased JSG panicle length compared to nontreated plants and seed viability seems questionable from these plants. Seed weight was reduced by imazapic and fluazifop but not by ethephon and mefluidide. |
Language: | English |
References: | 0 |
Note: | This item is an abstract only! |
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete): Askew, S. D., J. B. Willis, D. B. Ricker, and D. S. McCall. 2005. Microstegium viminrum seedhead suppression with chemicals and effects on surrounding vegetation. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 59:p. 106. |
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| Web URL(s): http://www.newss.org/proceedings/proceedings_2005.pdf#page=120 Last checked: 07/22/2013 Requires: PDF Reader Notes: Item is within a single large file |
| MSU catalog number: SB 610 .N62 v. 57 |
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