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Web URL(s):http://archive.lib.msu.edu/tic/ressum/2010/33.pdf
    Last checked: 01/23/2017
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Publication Type:
i
Report
Author(s):Brosnan, James T.; Breeden, Gregory K.
Author Affiliation:University of Tennessee
Title:Application timing affects the efficacy of herbicides used for control of bermudagrass in zoysiagrass fairways
Section:Grant-in-aid research program
Other records with the "Grant-in-aid research program" Section
Source:2010 Turfgrass and Environmental Research Summary. 2010, p. 33.
Publishing Information:Far Hills, NJ: United States Golf Association
# of Pages:1
Keywords:TIC Keywords: Application timing; Bermudagrass control; Chlorophyll index; Cynodon dactylon; Encroachment; Growing degree days; Herbicides; Mathematical equations; Susceptibility; Visual evaluation; Winter dormancy; Zoysia
Abstract/Contents:Presents a study initiated in 2009 to ascertain whether application timing "affects the efficacy of herbicides used for control of bermudagrass in zoysiagrass fairways." Notes that the primary objective of the study was "[to] determine the effects of application timing on the level of bermudagrass suppression achieved following applications of Fusilade II + Turflon Ester." Details methods and materials used during the experiment, noting that "plots measuring 1 m [meter] x 1 m were arranged in a 4 x 6 factorial design replicated three times." Provides an equation for calculating yearly accumulated growing degree days (GDD). Reports that "although this experiment is still ongoing [as of 2010], current results indicate that bermudagrass is most susceptible to applications of fluazifop and triclopyr surrounding periods of dormancy." Mentions that "relative chlorophyll index data collected on bermudagrass and zoysiagrass were significantly correlated with visual assessments of bermudagrass suppression and zoysiagrass injury each year." Concludes that "this study will conclude in spring 2011 when all data have been collected for treatments applied at the 2,250 GDD timing in 2010."
Language:English
References:0
See Also:Other Reports from this USGA research project: 2009-01-393
Note:Published as a part of USGA Turfgrass and Environmental Research Online, December 1 2010, Vol. 9, No. 23
Pictures, color
USGA Summary Points:Preliminary results suggest that bermudagrass is most susceptible to applications of fluazifop and triclopyr when transitioning out of winter dormancy in spring or transitioning into winter dormancy in fall. Increasing the rate of fluazifop above 6 fl oz/A did not improve efficacy for treatments applied to bermudagrass transitioning out of winter dormancy in spring or transitioning into winter dormancy in fall. When applied during the summer, increased rates of fluazifop resulted in greater bermudagrass suppression. Regardless of application rate, 'Zenith' zoysiagrass injury measured less than 13% for treatments applied after 200 GDD each year.
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Brosnan, J. T., and G. K. Breeden. 2010. Application timing affects the efficacy of herbicides used for control of bermudagrass in zoysiagrass fairways. Turfgrass Environ. Res. Summ. p. 33.
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http://archive.lib.msu.edu/tic/ressum/2010/33.pdf
    Last checked: 01/23/2017
    Requires: PDF Reader
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