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Web URL(s):http://www.swss.ws/wp-content/uploads/docs/2009 Proceedings-SWSS.pdf#page=208
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i
Report
Author(s):Kraka, E. K.; Byrd, J. D.; Taylor, J. M.
Author Affiliation:Mississippi State University, Mississippi State, MS
Title:Bermudagrass tolerance and weed control in pastures with combinations of nicosulfuron and metsulfuron
Section:Pasture and rangeland weed control
Other records with the "Pasture and rangeland weed control" Section
Meeting Info.:Orlando, Florida: February 9-12, 2009
Source:2009 Proceedings, Southern Weed Science Society. Vol. 62, 2009, p. 138.
Publishing Information:Champaign, Illinois: Southern Weed Science Society
# of Pages:1
Keywords:TIC Keywords: Bermudagrass control; Control methods; Cultivar evaluation; Echinochloa crusgalli; Festuca arundinacea; Glycosidases; Herbicide combinations; Herbicide evaluation; Metsulfuron methyl; Nicosulfuron; Setaria parviflora; Solanum carolinense; Sorghum halepense
Cultivar Names:Tifton 44; Cimarron; Journey
Trade Names:Accent
Abstract/Contents:"Many native and non-native plants pose a threat in pastures. Typical examples are johnsongrass (Sorghum halepense) which contain glycoside and when it breaks down results in production of prussic acid (hydrocyanic acid) and the aerial parts of horsenettle (Solanum carolinense) which contain solamine that is toxic to cattle and sheep. In 2006, 2007 and 2008 field experiments efficacy of nicosulfuron and metsulfuron combinations were evaluated for bermudagrass tolerance and weed control. In the first experiment knootroot foxtail (Setaria parviflora), johnsongrass (Sorghum halepense) and horsenettle (Solanum carolinense) were visually evaluated at 44 DAIT (Days After Initial Treatment) and 101 DAIT after herbicide applications on June 20, 2006 and September 11, 2006. Rubus spp, johnsongrass and horsenettle were visually evaluated 65 DAIT after herbicide applications made July 03, 2007 and August 23, 2007 for the second experiment. In the third experiment, 1- and 4-5 tiller barnyardgrass (Echinochloa crus-galli) control was visually evaluated 7, 25, 43 and 67 DAIT following two herbicide applications on May 29, 2008 and July 16, 2008. "Tifton 44" injury and yield reduction were also evaluated following herbicide applications on July 03, 2007 and August 23, 2007. "Tifton 44" injuries were evaluated 20, 29, 65 and 79 DAIT while yield reduction was evaluated once at 31 DAIT. Treatments in all the experiments consisted of untreated and treated. All herbicides were applied with NIS (0.5%) except Accent + Cimarron + MSO at 0.844 + 0.225 oz/A for barnyardgrass control. The experimental design in each experiment was a randomized complete block. Treatments were evaluated visually with a 0 (no control) to 100% (fully control) scale. Data were converted to percent control and were compared with untreated. The data were subjected to ANOVA and means were separated by Fishers Protected LSD P= (0.05). Numerically, knotroot foxtail control with all Accent combinations were lower ranging from 30 to 45% at 44 DAIT than 50 to 68% at 101 DAIT, except Plateau at 1.5 oz ai/A which provided 30% control at 44 DAIT but decreased to 23% by 101 DAIT. All herbicides applied showed similar control of johnsongrass which ranged from 85 to 95% by 44 DAIT. However, without the second sequential application Accent + Cimarron at 0.623 + 0.10 oz ai/A, 0.782 + 0.125 oz/A, 0.938 + 0.15 oz/A or a three way mix of Accent + Cimarron + Karmex at 0.623 + 0.10 +12.8 oz/A and Plateau at 1.5 oz/A, control decreased from 93 to 30%, 93 to 73%, 90 to 60%, 85 to 30% and 90 to 65%, respectively, at 101 DAIT. The level of johnsongrass control with the sequential applications of Accent + Cimarron at 0.623 + 0.10 oz/A or 0.782 + 0.125 oz/A, rendered 90 and 88% johnsongrass control at 101 DAIT, respectively. Horsenettle control with a single application of Accent combinations ranged from 78 to 91% at 44 DAIT. Horsenettle control with or without sequential applications increased at the later evaluation timing to 93 to 100% control at 101 DAIT. Although Accent + Cimarron + Karmex at 0.623 + 0.10 + 12.8 oz/A was not followed by sequential application like Accent + Cimarron at 0.782 + 0.125 oz/A, both rendered similar 90 and 98% control of horsenettle at 44 and 101 DAIT respectively. However, Plateau at 1.5 oz/A control of horsenettle was significantly lower than almost all Accent combinations at only 75% and 73% at 44 and 101 DAIT, respectively. In the second experiment in 2007, Rubus spp., johnsongrass and horsenettle control were 100% with sequential applications of Accent + Cimarron at 0.623 + 0.10 oz/A or Accent + Cimarron at 0.782 + 0.125 oz/A at 65 DAIT. Barnyardgrass control was excellent when treated at the 1-tiller growth stage. Application of all Accent combinations rendered 73% to 95% control of barnyardgrass at 7 DAIT and 85 to 95% at 25 DAIT. However, barnyardgrass control decreased because of new germination. The new germinating barnyardgrass was retreated at 4 - 5 tiller stage and sequential applications with Accent + Cimarron 0.563+0.15 oz/A and Accent + Cimarron at 0.844 + 0.225 oz/A rendered 48% and 65% control at 67 DAIT, respectively, while other Accent combinations provided 0 to 8% control. At 67 DAIT, Accent + Cimarron at 0.563 + 0.15 oz/A, Accent + Cimarron at 0.703 + 0.188 oz/A and Outrider at 1.0 oz ai/A without sequential application provided no control of barnyardgrass. Journey applied at 6.75 oz ai/A caused significant injury (68%) to "Tifton 44" at 20 DAIT while all Accent combinations caused injury that ranged from 28 to 43% and Outrider caused only 5%. At 29 DAIT, it was observed that Journey, Accent combinations and Outrider "Tifton 44" injury was reduced to 58%, 10 to 18%, and no injury, respectively. At 79 DAIT, none of the herbicides applied caused injury to "Tifton 44" except Journey which was still 23%. The lowest percentage of "Tifton 44" yield reduction occurred with Outrider, 6% while all Accent combinations caused injury that ranged between 22 and 30% at 31 DAIT. There were no significant differences among the all Accent combination effects on "Tifton 44" yield reduction. However, Journey rendered the highest significant yield reduction of 84% at 31 DAIT."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Kraka, E. K., J. D. Byrd, and J. M. Taylor. 2009. Bermudagrass tolerance and weed control in pastures with combinations of nicosulfuron and metsulfuron. South. Weed Sci. Soc. Proc. 62:p. 138.
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http://www.swss.ws/wp-content/uploads/docs/2009 Proceedings-SWSS.pdf#page=208
    Last checked: 07/25/2013
    Requires: PDF Reader
    Notes: Item is within a single large file
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