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Effect of Simulated Rainfall on Tall Fescue (Lolium Arundinaceum) Control with Glyphosate

Published online by Cambridge University Press:  20 January 2017

Travis W. Gannon  and
Fred H. Yelverton
Travis W. Gannon*
Affiliation:
Department of Crop Science, North Carolina State University, Box 7620, Raleigh, NC 27695-7620
Fred H. Yelverton
Affiliation:
Department of Crop Science, North Carolina State University, Box 7620, Raleigh, NC 27695-7620
*
Corresponding author's E-mail: travis_gannon@ncsu.edu
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Abstract

Field experiments were conducted to determine the effect of simulated rainfall after glyphosate application on tall fescue control. Three glyphosate formulations, three simulated rainfall amounts, two application rates, and three rain-free periods were evaluated. Glyphosate formulations evaluated included Roundup Original®, Roundup Pro®, and Roundup ProDry®. Herbicide drying periods, or rain-free intervals, included 15, 30, or 60 min. Simulated rainfall amounts were 0, 0.25, or 0.64 cm. Application rates of glyphosate were 3.4 or 6.7 kg ae/ha. Averaged across glyphosate formulation and simulated rainfall amount, excellent (≥ 90%) tall fescue control was observed when no simulated rainfall occurred within 60 min after application, whereas good (≥ 80%) tall fescue control was observed when 30 rain-free min were provided. Although current glyphosate labels are vague about rainfastness, these data indicate that critical rain-free periods may be as short as 30 min when higher application rates are used.

Keywords

glyphosatetall fescue, Lolium arundinaceum (Schreb.) S.J. Darbyshire FESAR ‘Kentucky 31’, ‘Southern Gold’
Type
Notes
Information
Weed Technology , Volume 22 , Issue 3 , September 2008 , pp. 553 - 557
Copyright
Copyright © Weed Science Society of America 

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