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Postemergence Control of Hybrid Bermudagrass (Cynodon transvaalensis Burtt-Davy × Cynodon dactylon)

Published online by Cambridge University Press:  20 January 2017

Jason A. Ferrell ,
Tim R. Murphy  and
David C. Bridges
Jason A. Ferrell*
Affiliation:
Department of Agronomy, University of Florida, Gainesville, FL 32611; Department of Crop and Soil Sciences, University of Georgia, Griffin, GA 30223
Tim R. Murphy
Affiliation:
Department of Agronomy, University of Florida, Gainesville, FL 32611; Department of Crop and Soil Sciences, University of Georgia, Griffin, GA 30223
David C. Bridges
Affiliation:
Department of Agronomy, University of Florida, Gainesville, FL 32611; Department of Crop and Soil Sciences, University of Georgia, Griffin, GA 30223
*
Corresponding author's E-mail: [email protected]
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Abstract

Bermudagrass [Cynodon dactylon (L.) Pers.] control for at least 1 yr is necessary to establish other forage species in pasture and hay field renovations, or to plant pine (Pinus spp.) in infested fields. Potential herbicides for hybrid Bermudagrass control were evaluated using single, repeat, and multiyear applications. Repeat applications were made 30 d after the first application beginning in mid-August each year. Imazapyr applied once at 0.56 or 1.12 kg/ha controlled hybrid Bermudagrass (cv. ‘Tifton 44’) 88 and 97%, respectively, 52 wk after treatment with no difference between rates observed. Additionally, imazapyr applied for two consecutive years controlled hybrid Bermudagrass 100%. Glyphosate isopropylamine salt and glyphosate trimethylsulfonium salt, applied for 1 yr at rates of 4.2 or 1.7 fb (followed by) 1.7 kg ae/ha and 4.8 or 1.9 fb 1.9 kg ae/ha, respectively, provided between 70 and 78% control at 52 wk after the last treatment (WALT). Hybrid Bermudagrass control from either formulation of glyphosate applied for two consecutive years ranged between 79 and 91% at 52 WALT. Relative to a 1-yr application program, either glyphosate formulation applied for two consecutive years did not significantly improve Bermudagrass control at 52 WALT. The addition of fluazifop-P at 0.42 kg ai/ha or clethodim at 0.2 kg ai/ha to glyphosate formulations did not significantly improve hybrid Bermudagrass control relative to glyphosate applied alone. However, a tank-mix of clethodim plus either formulation of glyphosate applied for two consecutive years generally improved hybrid Bermudagrass control relative to applications in only 1 yr.

Keywords

Clethodimfluazifop-Pglyphosateimazapyrsethoxydimhybrid Bermudagrass, Cynodon transvaalensis Burtt-Davy × Cynodon dactylon (L.) Pers. ‘Tifton 44’ # CYNDALong-term weed controlrepeat applicationsCRP, Conservation Reserve Programfb, followed byIPA, isopropylamine salt of glyphosateMAT, months after treatmentTMS, trimethylsulfonium salt of glyphosateWALT, weeks after last treatment
Type
Research Article
Information
Weed Technology , Volume 19 , Issue 3 , September 2005 , pp. 636 - 639
Copyright
Copyright © Weed Science Society of America 

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Footnotes

1 Publication R-10213 Florida Agricultural Experiment Station Journal Series.

References

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