Full TGIF Record # 227345
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Web URL(s):http://www.swss.ws/wp-content/uploads/docs/2013 Proceedings-SWSS.pdf#page=101
    Last checked: 08/12/2013
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Author(s):Flessner, M. L.; McElroy, J. S.; Wehtje, G. R.
Author Affiliation:Auburn University, Auburn, AL
Title:Glyphosate tolerant perennial ryegrass cultivars: Tolerance determination
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Meeting Info.:Houston, Texas: January 28-30, 2013
Source:Proceedings of the Southern Weed Science Society: 66th Annual Meeting. Vol. 66, 2013, p. 14.
# of Pages:1
Publishing Information:Champaign, Illinois: Southern Weed Science Society
Keywords:TIC Keywords: Clipping weight; Cultivar evaluation; Cultivar variation; Glyphosate; Herbicide resistance; Lolium perenne
Cultivar Names:Caddy Shack; Replay; JS501; Top Gun II
Abstract/Contents:"'Replay' and 'JS501' perennial ryegrass (Lolium perenne) cultivars have been conventionally bred for tolerance to glyphosate, potentially allowing the herbicide to be used as a selective weed control agent in these cultivars. Previous field research indicates minimal discoloration of these cultivars from glyphosate applied at approximately 0.5 kg ae ha-1 and that 20% leaf firing occurs at 0.81 kg ae ha-1. However, the glyphosate tolerance of these cultivars has not been directly compared to unenhanced cultivars. Greenhouse experiments were conducted to compare glyphosate tolerance of Replay and JS501 to cultivars with unenhanced tolerance- 'Caddy Shack' and 'Top Gun II.' Plants were established from seed in potting mix and treated at approximately 3 to 4 tillers. Plant height was maintained at 7.5 cm via mowing prior to treatment application and 2, 4, and 6 weeks after treatment (WAT). Glyphosate was applied at 0 (nontreated) to 6.3 kg ae ha-1 across 13 treatments in a 280 L ha-1 carrier volume via a single TeeJet 8002VS nozzle in an enclosed research spray cabinet. Each treatment was replicated 4 times, and the experiment was repeated-in-time. Visible injury was assessed relative to the nontreated 2, 4, and 6 WAT on a 0 to 100 scale where 0 corresponds to no injury and 100 corresponds to plant death. Clipping weight data (biomass above 7.5 cm) were collected 6 WAT and transformed to a percent reduction relative to the nontreated. Cultivars were compared using I50 (50% population inhibition) values using GraphPad Prism software for both data types. I50 values 6 WAT obtained from visible injury data were 2.56, 2.64, 0.81, and 0.84 kg glyphosate ha-1 for Replay, JS501, Caddy Shack, and Top Gun II, respectively. Similarly, I50 values 6 WAT obtained from clipping weight data were 2.13, 1.90, 0.67, and 0.56 kg glyphosate ha-1 for Replay, JS501, Caddy Shack, and Top Gun II, respectively. Analysis revealed two tolerance groups; Replay and JS501 were similar in tolerance to glyphosate and were up to 4 times more tolerant than Caddy Shack and Top Gun II, across rating dates and data types. Results are similar to previous research that indicate minimal discoloration and leaf firing at rates < 0.5 kg glyphosate ha-1. Previous research indicates the recommended rate for annual bluegrass (Poa annua) control in mature stands of Replay and JS501 is 0.29 kg glyphosate ha-1. Therefore this research indicates Replay and JS501 are tolerant to glyphosate rates that are adequate for weed control in a single application."
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ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Flessner, M. L., J. S. McElroy, and G. R. Wehtje. 2013. Glyphosate tolerant perennial ryegrass cultivars: Tolerance determination. South. Weed Sci. Soc. Proc. 66:p. 14.
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http://www.swss.ws/wp-content/uploads/docs/2013 Proceedings-SWSS.pdf#page=101
    Last checked: 08/12/2013
    Requires: PDF Reader
    Notes: Item is within a single large file
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