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Effects of Postemergence Herbicides on Centipedegrass Seed Production

Published online by Cambridge University Press:  20 January 2017

Jason A. Ferrell ,
Timothy R. Murphy ,
William K. Vencill  and
Wayne R. Guerke
Jason A. Ferrell
Affiliation:
Department of Crop and Soil Sciences, University of Georgia, Athens, GA 30602
Timothy R. Murphy*
Affiliation:
Department of Crop and Soil Sciences, University of Georgia, Griffin, GA 30223
William K. Vencill
Affiliation:
Department of Crop and Soil Sciences, University of Georgia, Athens, GA 30602
Wayne R. Guerke
Affiliation:
Georgia Seed Test Laboratory, Tifton, GA 31793
*
Corresponding author's E-mail: tmurphy@uga.edu
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Abstract

Field studies were conducted in 2001 and 2002 to determine the effect of clethodim, sethoxydim, and halosulfuron on centipedegrass seedhead suppression, seed yield, and seed germination. Clethodim (0.28 kg/ha), sethoxydim (0.31 kg/ha), and halosulfuron (0.06 kg/ha) applications were made at −2, 0, 2, 4, and 6 wk after mowing stopped (WAMS) in each year. Seedhead suppression varied in severity between 2001 and 2002, with increased suppression in 2001. Clethodim reduced seedhead emergence 50 and 33% when applied at 2 and 4 WAMS, respectively, in 2001. Sethoxydim reduced seedhead emergence by 21 and 18% when applied at 2 and 4 WAMS, respectively, in 2001. Halosulfuron had no effect on seedhead emergence in either year and did not reduce seed yield at any application timing. Clethodim reduced seed yield between 22 and 44% at all application timings. The pattern of yield reduction from sethoxydim was similar to that caused by clethodim; however, yield reduction with sethoxydim ranged between 7 and 48% for all application timings. The greatest reduction in seed yield occurred when clethodim and sethoxydim were applied 4 WAMS. Seed germination was not affected by halosulfuron or sethoxydim at any application timing. Clethodim, when applied at 4 and 6 WAMS, decreased seed germination by 17 and 20%, respectively.

Keywords

Clethodimhalosulfuronsethoxydimcentipedegrass, Eremochloa ophiuroides (Munro) Hack. ‘Tifblair’ #3 ERLOPSeed germinationWAMS, weeks after mowing stoppedWAT, weeks after treatment
Type
Research
Information
Weed Technology , Volume 17 , Issue 4 , December 2003 , pp. 871 - 875
Copyright
Copyright © Weed Science Society of America 

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