Full TGIF Record # 209433
Item 1 of 1
DOI:10.21273/HORTSCI.47.7.932
Publication Type:
i
Refereed
Author(s):Baldwin, Christian A.; Brede, A. Douglas; Mayer, Jami J.
Author Affiliation:Jacklin Seed by Simplot, Post Falls, ID
Title:'JS501' and 'Replay' perennial ryegrass glyphosate tolerance and rates required for annual bluegrass (Poa annua L.) control
Section:Turf management
Other records with the "Turf management" Section
Source:HortScience. Vol. 47, No. 7, July 2012, p. 932-935.
# of Pages:4
Publishing Information:Alexandria, Virginia: American Society for Horticultural Science
Keywords:TIC Keywords: Application rates; Glyphosate; Herbicide evaluation; Lolium perenne; Poa annua control
Abstract/Contents:"Incorporating the use of glyphosate into a weed management program offers turfgrass managers increased flexibility and cost savings when attempting to control troublesome weeds such as annual bluegrass (ABG) (Poa annua L.). Field trials of glyphosate tolerant perennial ryegrass (PRG) (Lolium perenne L.) cultivars, JS501 and Replay, were initiated to determine glyphosate tolerance and rates required for ABG control. In the tolerance trial, glyphosate was applied on 15 Sept. 2010 and 9 Aug. 2011 at rates of 0, 0.29, 0.58, 1.16, 1.74, 2.32, and 3.48 kg路ha-1 a.e. Glufosinate was also applied at 0, 1.68, and 3.37 kg路ha-1 a.i. In the ABG control trial, glyphosate was applied on 17 June followed by 19 Aug. 2009 and 25 June followed by 25 Aug. 2010 at rates of 0, 0.15, 0.29, 0.44, and 0.58 kg路ha-1 a.e. In the tolerance trial, linear regression analysis revealed a glyphosate application rate of 0.81 kg路ha-1 a.e. was required to cause 20% leaf firing. By the end of the trial, the highest rate of glufosinate resulted in nearly complete desiccation of Replay PRG. For ABG control, after four glyphosate applications over a 2-year period, a rate of 0.29 kg路ha-1 a.e. or greater resulted in less than 10% ABG. Untreated plots had ~83% ABG infestation. Discoloration was not noted for either PRG cultivar at any point over the 2-year trial period. Based on the environmental conditions of each trial, results suggest a recommended application rate should be 0.29 kg路ha-1 a.e. during summer months. This rate is sufficient for ABG control and also provides protection in case spray overlap occurs during an application."
Language:English
References:15
Note:Tables
Graphs
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Baldwin, C. A., A. D. Brede, and J. J. Mayer. 2012. 'JS501' and 'Replay' perennial ryegrass glyphosate tolerance and rates required for annual bluegrass (Poa annua L.) control. HortScience. 47(7):p. 932-935.
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DOI: 10.21273/HORTSCI.47.7.932
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