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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: bmccrty@clemson.edu.
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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

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