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Glyphosate Efficacy on Velvetleaf Varies with Application Time of Day

Published online by Cambridge University Press:  20 January 2017

Aaron L. Waltz ,
Alex R. Martin ,
Fred W. Roeth  and
John L. Lindquist
Aaron L. Waltz*
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska–Lincoln, 279 Plant Science, Lincoln, NE 68583-0915
Alex R. Martin
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska–Lincoln, 279 Plant Science, Lincoln, NE 68583-0915
Fred W. Roeth
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska–Lincoln, 279 Plant Science, Lincoln, NE 68583-0915
John L. Lindquist
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska–Lincoln, 279 Plant Science, Lincoln, NE 68583-0915
*
Corresponding author's E-mail: awaltz1@bigred.unl.edu
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Abstract

Field and growth chamber experiments determined the efficacy of temporal glyphosate applications on velvetleaf. Glyphosate was applied postemergence to velvetleaf periodically before and during light and after dark. In 1999, glyphosate at 840 g ae/ha applied before sunrise and after midday provided 54 and 100% velvetleaf control, respectively. In 2000, glyphosate at 840 g/ha applied before sunrise, midday, and after sunset provided 69, 100, and 37% velvetleaf control, respectively. In the growth chamber, glyphosate at 840 g/ha applied before or after light reduced velvetleaf biomass 15 to 20% or 32 to 47%, respectively, and reduced velvetleaf height 24% or 45 to 54%, respectively. Velvetleaf control was consistently greater with glyphosate applications during light compared with dark, regardless of constant air temperature and relative humidity (growth chamber), dew absence or presence (field and growth chamber), or leaf blade orientation (growth chamber) with natural light–dark movements or a fixed horizontal position.

Keywords

Glyphosatevelvetleaf, Abutilon theophrasti Medic. #3 ABUTHApplication timingdifferential responseDAT, days after treatmentPOST, postemergencePPFD, photosynthetic photon flux densityRH, relative humidity.
Type
Research
Information
Weed Technology , Volume 18 , Issue 4 , December 2004 , pp. 931 - 939
Copyright
Copyright © Weed Science Society of America 

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