Full TGIF Record # 224997
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Web URL(s):http://www.swss.ws/wp-content/uploads/docs/2004%20Proceedings-SWSS.pdf#page=229
    Last checked: 07/17/2013
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Report
Author(s):Ducar, J. Tredaway; Butler, T. J.
Author Affiliation:Ducar: Berry College, Mt. Berry, GA; Butler; Texasm A&M Agricultural Research and Extension Center, Stephenville, TX
Title:Annual grass control with imazapic
Section:Weed management in pastures and rangeland
Other records with the "Weed management in pastures and rangeland" Section
Meeting Info.:Memphis, Tennessee: January 26-28, 2004
Source:Proceedings: Southern Weed Science Society: 57th Annual Meeting. Vol. 57, 2004, p. 131.
Publishing Information:Champaign, Illinois: Southern Weed Science Society
# of Pages:1
Keywords:TIC Keywords: Annual grasses; Cynodon dactylon; Herbicide efficacy; Herbicide evaluation; Imazapic; Weed control
Abstract/Contents:"Previous research has indicated that imazapic at 3,4, and 6 fl. oz/acre will control large crabgrass > 90% POST (Boyd et al. 2003) and > 70% PRE (Butler and Tredaway Ducar 2003). Imazapic will control field sandbur in a light infestation at 4 fl. oz/acre while requiring a 6 fl. oz/acre rate in a heavier infestation (Tredaway Ducar et. al 2002). Although imazapic was labeled for use in pasture and rangeland in 2002, there are many weeds for which we are still unsure of the effect that imazapic will have on them. Many of these are left as blanks in the state recommendation guides. Field trials were conducted at Mt. Berry, Georgia and near Stephenville, Texas in 2003 to evaluate the efficacy of imazapic for annual grass control in Coastal, Tifton 85, and Tifton 44 bermudagrass varieties. Weeds evaluated included large crabgrass (Digitaria sanguinalis), junglerice (Echinochloa colona), barnyardgrass (Echinochloa crus-galli), green foxtail (Setaria viridis), and broadleaf signalgrass (Brachiaria platyphylla). Treatments evaluated included imazapic at 1, 2, 3, 4, and 6 fl. oz./A with a non-ionic surfactant (0.5% v/v in Georgia and 0.25% v/v in Texas). Treatments were arranged in a randomized complete block design with four replications with plots measuring 8 feet by 25 feet. Herbicides were applied using a CO2 pressurized backpack sprayer calibrated to deliver 15 gallons per acre. Postemergence weed control and bermudagrass phytotoxicity was evaluated 30, 60, and 90 days after herbicide application (DAA). In evaluating bermudagrass injury, Tifton 85 and Coastal in Texas at 30 DAA was injured 18% at 4 fl. oz/acre and 15% at 3 fl. oz/acre which were not different from each other but together were significantly higher than the 1 and 2 fl. oz rates, which had 4% injury. At 60 DAA, the 1 and 2 fl. oz rates injury was reduced to zero, and the 3 and 4 fl. oz rates decreased to 6 and 7%, respectively. In Georgia, the Tifton 44 showed similar results with the 6 fl. oz rate providing the most injury (19%). The 2 and 4 fl. oz rates were not different from each other. At 60 DAA, the 3, 4, and 6 fl. oz rates decreased injury to 8, 5, and 14%. At 90 DAA, all rates provided the same amount of injury (6%). Two Echinochloa sp. were evaluated, jungle rice and barnyardgrass. Junglerice was controlled >85% 90 DAA with the 3 and 4 fl. oz rates of imazapic; barnyardgrass was controlled 99% 90DAA with the 2, 4, and 6 fl. oz rates of imazapic. Large crabgrass control in Texas was 90% or better with 2, 3, or 4 fl. oz/acre at 30 DAA; however, control decreased with time. At 60 DAA, control was 80, 83, and 90% respectively, and at 90 DAA, 70, 77, and 85%, respectively. In Georgia, control did not decrease as much as it did in Texas. At 2, 4, and 6 fl. oz/acre large crabgrass control was 97, 99, and 98% at 30 DAA, respectively. At 60 DAA, control remained the same. At 90 DAA, control decreased to 80, 85, and 90% respectively. Broadleaf signalgrass control was >86% with the 3 and 4 fl. oz rates at all evaluation timings. However, at the 2 fl. oz rate, control was 90, 87, and 50% for 30, 60, and 90 DAA, respectively. The 1 fl. oz/acre rate did not control broadleaf signalgrass. Green foxtail control was 96% or greater 30 and 60 DAA but then reduced to 80% at 90 DAA. At the 4 fl. oz rate, early control at 30 DAA was 90% but decreased throughout the season to 86% at 60 DAA and finally to 70% at 90 DAA. Green foxtail control at the 2 fl. oz rate was <54% at all evaluation timings. These findings conclude that there are more species that imazapic could expand on their label and the weed spectrum is much greater than what is currently known."
Language:English
References:3
Note:"The changing world of weed science"
This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Ducar, J. T., and T. J. Butler. 2004. Annual grass control with imazapic. South. Weed Sci. Soc. Proc. 57:p. 131.
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http://www.swss.ws/wp-content/uploads/docs/2004%20Proceedings-SWSS.pdf#page=229
    Last checked: 07/17/2013
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    Notes: Item is within a single large file
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