Full TGIF Record # 152679
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DOI:15/2/article-p318.xml?rskey=9BlgIQ
Web URL(s):https://journals.ashs.org/horttech/view/journals/horttech/15/2/article-p324.xml?rskey=9BlgIQ
    Last checked: 11/21/2019
    Requires: PDF Reader
Publication Type:
i
Refereed
Author(s):Koschnick, Tyler J.; Haller, William T.; Fox, Alison M.
Author Affiliation:Koschnick: Graduate Research Assistant; Haller: Professor, University of Florida/Institute of Food and Agricultural Sciences, Center for Aquatic and Invasive Plants; Fox: Associate Professor, Agronomy Department, University of Florida, Gainesville, Florida
Title:Turf and ornamental plant tolerances to endothall in irrigation water II. turf species
Section:Research reports
Other records with the "Research reports" Section
Source:HortTechnology. Vol. 15, No. 2, April-June 2005, p. 324-329.
Publishing Information:Alexandria, VA: American Society for Horticultural Science
# of Pages:6
Keywords:TIC Keywords: Aquatic herbicides; Herbicide resistance; Aquatic weed control; Endothall; Herbicide application; Irrigation; Water use restrictions
Trade Names:Aquathol
Abstract/Contents:Two formulations of the contact herbicide endothall are used to control submersed aquatic weeds. Waters treated with the amine or dipotassium sal formulations have irrigation restrictions varying from 7 to 25 days depending on the concentration of endothall applied. These water-use restrictions may be reduced for turfgrass if studies conclude there is no phytotoxicity to turf species irrigated with concentrations of endothall that may exist after an aquatic application. Two separate experiments were conducted to determine turfgrass tolerance to endothall in irrigation water on five species of grass: annual (Lolium multiflorum), annual bluegrass (Poa annua), centipedegrass (Eremochloa ophiuroides), 'Floratam' st. augustinegrass (Stenotaphrum secundatum), and 'Tifton 419' bermudagrass (Cynodon dactylon). Expt. 1 used constant concentrations of endothall; Expt. 2 use decreasing concentrations of endothall over time. Annual turf species (bluegrass and ryegrass) were generally more susceptible that perennial turfgrasses. Concentrations resulting in a 10% reduction in total dry weight harvested compared to control plants [effective concentration (EC10)] for the amine and dipotassium salt formulations were 10 and 14 mg路L-1 (ppm) a.i. on annual ryegrass, 10 and 16 mg路L-1 a.i. on annual bluegrass, 50 and 54 mg路L-1 a.i. on centipedegrass, 47 and 72 mg路L-1 a.i. for st. augustinegrass, and for bermudagrass 1301 and 908 mg路L-1 a.i. in Expt. 1. Expt. 2 resulted in EC10 values of 31 and 35 mg路L-1 a.i. on annual ryegrass, 7 and 12 mg路L-1 a.i. on annual bluegrass, 32 and 99 mg路L a.i. on centipedegrass , 27 and 20 mg路L-1 a.i. on st. augustinegrass for the amine and dipotassium formulations of endothall respectively, and 958 mg路L-1 a.i. for the dipotassium formulation on bermudagrass. There was no effect on bermudagrass dry weights when exposed to the amine formulation of endothall in Expt. 2 at concentrations up to 1600mg路L-1 a.i. There is a low risk of inhibiting growth of turf species at endothall concentrations used for aquatic weed control considering the maximum use concentrations, typical uses of the products, and decomposition rates.
Language:English
References:10
See Also:See also Part I "Turf and ornamental plant tolerances to endothall in irrigation water I. Ornamental species" HortTechnology, 15(2) April-June 2005, p. 318-323 R=152678 R=152678
Note:Graphs
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Koschnick, T. J., W. T. Haller, and A. M. Fox. 2005. Turf and ornamental plant tolerances to endothall in irrigation water II. turf species. HortTechnology. 15(2):p. 324-329.
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DOI: 15/2/article-p318.xml?rskey=9BlgIQ
Web URL(s):
https://journals.ashs.org/horttech/view/journals/horttech/15/2/article-p324.xml?rskey=9BlgIQ
    Last checked: 11/21/2019
    Requires: PDF Reader
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