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Influence of Fenoxaprop and Ethofumesate Treatments on Suppression of Common Bermudagrass (Cynodon dactylon) in Tall Fescue (Festuca arundinacea) Turf

Published online by Cambridge University Press:  12 June 2017

B. Jack Johnson  and
Robert N. Carrow
B. Jack Johnson
Affiliation:
Crop and Soil Science, Univ. Georgia, Georgia Stn., Griffin, GA 30223-1797
Robert N. Carrow
Affiliation:
Crop and Soil Science, Univ. Georgia, Georgia Stn., Griffin, GA 30223-1797
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Abstract

Experiments were conducted over a 3-yr period to determine the rate and frequency of herbicide application needed to control common bermudagrass growing in a tall fescue turf. In Experiment I, fenoxaprop plus ethofumesate applied at 0.2 + 1.7 kg/ha in late April and repeated at the same rate at 3- to 4-wk intervals for a total of five applications resulted in excellent (≥ 97%) common bermudagrass suppression. The suppression was higher from combination of fenoxaprop and ethofumesate than when fenoxaprop was applied at 0.2 kg/ha in five applications (≤ 67%). In Experiment II, fenoxaprop plus ethofumesate applied at 0.2 +1.7 kg/ha required four applications per year to effectively suppress common bermudagrass (95%) in 1993, but five applications were needed to obtain similar suppression (96%) in 1994. Tifway bermudagrass was not suppressed during 1994 when fenoxaprop plus ethofumesate were applied at 0.2 +1.7 kg/ha in each of five applications (30%). In most instances, fenoxaprop plus ethofumesate applied at 0.2 +1.7 kg/ha caused only slight to moderate (< 30%) injury to tall fescue for 1 to 2 wk after treatment. When injury occurred, it was temporary as the turf fully recovered within 2 to 3 wk after treatment. An exception occurred in early July 1992 when fenoxaprop plus ethofumesate caused 44% injury to tall fescue after the four applications.

Keywords

Ethofumesate, (±)-2-ethoxy-2,3-dihydro-3,3-dimethyl-5-benzofuranyl methanesulfonatefenoxaprop, (±)-2-[4-[(6-chloro-2-benzoxazoly)oxylphenoxy]propanoic acid‘common’ bermudagrass, Cynodon dactylon (L.) Pers. # CYNDA‘Tifway’ bermudagrass, Cynodon transvaalensis Buntt-Davy × Cynodon dactylon (L.) Pers. #CYNTR‘K-31’ tall fescue, Festuca arundinacea Schreb. #FESARCommon bermudagrass controltall fescue injuryrenovationCYNDAFESAR
Type
Research
Information
Weed Technology , Volume 9 , Issue 4 , December 1995 , pp. 789 - 793
Copyright
Copyright © 1995 by the Weed Science Society of America 

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References

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