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Web URL(s):http://www.swss.ws/wp-content/uploads/docs/2010 Proceedings-SWSS.pdf#page=94
    Last checked: 07/31/2013
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Publication Type:
i
Report
Author(s):Elmore, M. T.; Brosnan, J. T.; Breeden, G. K.
Author Affiliation:University of Tennessee, Knoxville, TN
Title:Early and late postemergence control of dallisgrass (Paspalum dilatatum Poir.) in tall fescue
Section:Posters
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Meeting Info.:Little Rock, Arkansas: January 25-27, 2010
Source:2010 Proceedings, Southern Weed Science Society. Vol. 63, 2010, p. 44.
# of Pages:1
Publishing Information:Champaign, Illinois: Southern Weed Science Society
Keywords:TIC Keywords: Application timing; Dallisgrass control; Festuca arundinacea; Fluazifop-P-butyl; Herbicide evaluation; MSMA; Mesotrione; Paspalum dilatatum; Pesticide usage legislation
Abstract/Contents:"Dallisgrass (Paspalum dilatatum) is a problematic weed that commonly invades various turfgrass areas throughout the southern United States. Restrictions on the use of monosodium methanearsonate (MSMA) in turfgrass management will limit the number of herbicides that can be used to provide selective control of this species. In 2008, a two-year study was initiated at the University of Tennessee (Knoxville, TN) evaluating programs for selective dallisgrass control in tall fescue (Festuca arundinacea) turf. Treatments included fluazifop-p-butyl (fluazifop) at 0.28 kg ha-1, mesotrione at 0.105 kg ha-1, and fluazifop + mesotrione at 0.28 kg ha-1 + 0.105 kg ha-1, respectively. All treatments included a nonionic surfactant at a 0.25% v/v ratio. Treatments were applied singly and sequentially (3 week interval) in early spring [<160 growing degree days (GDD10)] and early summer (>500 GDD10) to a mature stand of tall fescue maintained as a utility turf with respect to irrigation, fertility, and mowing. Yearly accumulated GDD10C were calculated beginning January 1st using a Celsius scale according to the equation, GDD10C = [(Tmax - Tmin)/2] - Tbase where Tmax represented the daily maximum air temperature, Tmin represented the daily minimum air temperature, and Tbase equaled 10°C. Dallisgrass control and tall fescue injury were assessed visually on a 0 to 100% scale, with a score of 100 representing complete plant death. When applied in early spring (<160 GDD10) in 2008, single and sequential applications of fluazifop at 0.28 kg ha-1 provided 90% or greater control of dallisgrass at 77 days after initial treatment (DAIT). When applied in early summer (>500 GDD10), single and sequential applications of fluazifop at 0.28 kg ha-1 only provided 0 and 30% control at 77 DAIT in 2008 and 2009, respectively. A single application of fluazifop + mesotrione in early spring (<160 GDD10) provided 93% control of dallisgrass 77 DAIT in 2008. When applied in early summer (>500 GDD10) the same treatment only provided 56 % control at 21 DAIT and 0% control at 77 DAIT. Sequential applications of this treatment yielded similar results. The level of dallisgrass control provided by single and sequential applications of fluazifop at 77 DAIT in 2008 was not significantly different from that which was observed following applications of fluazifop + mesotrione in both the early spring (<160 GDD10) and early summer (>500 GDD10). These data suggest that application timing may affect the level of dallisgrass control provided by applications of fluazifop and fluazifop + mesotrione."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Elmore, M. T., J. T. Brosnan, and G. K. Breeden. 2010. Early and late postemergence control of dallisgrass (Paspalum dilatatum Poir.) in tall fescue. South. Weed Sci. Soc. Proc. 63:p. 44.
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http://www.swss.ws/wp-content/uploads/docs/2010 Proceedings-SWSS.pdf#page=94
    Last checked: 07/31/2013
    Requires: PDF Reader
    Notes: Item is within a single large file
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