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Bahiagrass (Paspalum notatum) Seedhead Suppression Following Consecutive Yearly Applications of Plant Growth Retardants

Published online by Cambridge University Press:  12 June 2017

Robert D. Baker ,
Lambert B. McCarty ,
Daniel L. Colvin ,
Jeffery M. Higgins ,
Jan S. Weinbrecht  and
Jorge E. Moreno
Robert D. Baker
Affiliation:
Department of Agronomy, University of Florida, Gainesville, FL 32611
Lambert B. McCarty*
Affiliation:
Department of Horticulture, Clemson University, Clemson, SC 29634-0375
Daniel L. Colvin
Affiliation:
Department of Agronomy, University of Florida
Jeffery M. Higgins
Affiliation:
Department of Agronomy, Auburn University, Auburn, AL 36849-5412
Jan S. Weinbrecht
Affiliation:
Department of Environmental Horticulture, University of Florida
Jorge E. Moreno
Affiliation:
Department of Environmental Horticulture, University of Florida
*
Corresponding author's E-mail: [email protected].
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Abstract

Field trials evaluated sequential applications of plant growth retardants (PGRs) to bahiagrass for a 3-yr period at two Florida locations: Newberry (north Florida) and Okeechobee (south Florida). Seven PGRs from various chemical families were used: glyphosate, fluazifop, sethoxydim, maleic hydrazide, trinexapac-ethyl, imazapic, and imazaquin. In 1991 and 1992, PGRs reduced turf color for 2 to 4 wk after treatment (WAT) at the Newberry location but remained above acceptable levels (> 5.0) and recovered by 6 WAT. In 1993, glyphosate, fluazifop, and maleic hydrazide reduced turf color below acceptable levels (< 5.0) 4 WAT, but turf color was acceptable by 6 WAT. Turf color was slightly reduced following single and sequential imazapic applications in Okeechobee; however, turf recovered by 8 WAT. Cumulative seedhead suppression at both locations increased during the 3 yr resulting in at least a 60% reduction in seedhead numbers. Seedhead production each year was 10 to 50% less at 12 WAT in treated plots than in the previous year. Single applications of imazapic and imazapic + imazaquin provided 85 to 100% seedhead suppression for 12 WAT and 100% suppression for up to 16 wk following sequential applications made 8 wk after the initial application (WAI). Single applications of glyphosate, fluazifop, and maleic hydrazide provided ≥ 70% seedhead suppression for 4 to 8 WAT. Sequential applications of fluazifop made 8 WAI provided > 70% control of seedheads through 8 to 16 WAI for 3 yr.

Keywords

Fluazifop, (±)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl]oxy]phenoxy]propanoic acidglyphosate, N-(phosphonomethyl)glycineimazapic, (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-methyl-3-pyridinecarboxylic acidimazaquin, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acidmaleic hydrazide, 1,2-dihydro-3,6-pyridazinedionesethoxydim, 2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-onetrinexapac-ethyl, 4-(cyclopropyl-α-hydroxy-methylene)-3,5-dioxo-cyclo-hexenecarboxylic acid ethyl esterbahiagrass, Paspalum notatum Fluegge #PASNOChemical mowingright-of-waysPGR, plant growth retardantWAI, weeks after initial treatmentWAT, weeks after treatment
Type
Research
Information
Weed Technology , Volume 13 , Issue 2 , June 1999 , pp. 378 - 384
Copyright
Copyright © 1999 by the Weed Science Society of America 

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References

Literature Cited

Flanagan, M. S. and Peacock, C. H. 1986. Effects of Plant Growth Regulators on Bahiagrass. Gainesville, FL: University of Florida, Turfgrass Research in Florida Technical Rep. 220 p.Google Scholar
Goatley, J. M., Maddox, V. L., and Watkins, R. M. 1996. Growth regulation of bahiagrass (Paspalum notatum Fluegge) with imazaquin and AC 263,222. HortScience 31:396–399.CrossRefGoogle Scholar
Johnson, B. J. 1990. Response of bahiagrass (Paspalum notatum) to plant growth regulators. Weed Technol. 4:895–899.CrossRefGoogle Scholar
McCarty, L. B. 1997. Bahiagrass for Florida lawn. In Ruppert, K. C. and Black, R. J., eds. Florida Lawn Handbook. Gainesville, FL: University of Florida. 217 p.Google Scholar
Nelson, L. S., Getsinger, K. D., and Luu, K. T. 1993. Effect of chemical treatments on bahiagrass (Paspalum notatum) suppression. Weed Technol. 7:127–133.CrossRefGoogle Scholar
Yelverton, F. H., McCarty, L. B., and Murphy, T. R. 1997. Effects of imazameth on the growth of Paspalum notatum Fluegge. Int. Turfgrass Soc. Res. J. 8:1085–1094.Google Scholar