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Carrier Volume Affects Herbicide Activity in Simulated Spray Drift Studies

Published online by Cambridge University Press:  20 January 2017

Philip A. Banks  and
Jill Schroeder
Philip A. Banks*
Affiliation:
MARATHON-Agricultural & Environmental Consulting, Inc., 2649 Navajo Road, Las Cruces, NM 88007
Jill Schroeder
Affiliation:
MARATHON-Agricultural & Environmental Consulting, Inc., 2649 Navajo Road, Las Cruces, NM 88007
*
Corresponding author's E-mail: marathonag@zianet.com
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Abstract

Field studies were conducted to determine if varying carrier volume proportionally with herbicide dosage, thus maintaining constant herbicide concentration in the carrier, would change the response of sweet corn to glyphosate and of cotton to 2,4-D when compared with using a constant carrier volume where herbicide concentration would vary and be more dilute. For all the parameters measured, more sweet corn injury occurred if the concentration of glyphosate was constant in all volumes of spray. The glyphosate no-effect level for sweet corn was determined to be 0.046 kg/ha when using the variable carrier volume but was over four times greater (0.185 kg/ha) when applied at the constant carrier volume of 281 L/ha. Cotton response to 2,4-D was similar, with the constant herbicide concentration in the carrier at the lower volumes causing greater injury. The response of seed cotton yield was not different when comparing constant to variable carrier volume. The highly sensitive growth stage of cotton at the time of application (bud formation before blooming) may explain this result. These studies demonstrate the need to use carrier volumes that are proportional to the herbicide dosage, thus maintaining constant herbicide concentration in the carrier, when conducting simulated herbicide drift research. Failure to do so could underestimate the potential for injury.

Keywords

Glyphosate2,4-Dcotton, Gossypium hirsutum L. ‘Acala 1517-95’sweet corn, Zea mays L. ‘Sweetie 82’Crop injurynontarget cropsoff-site movementDAT, days after treatmentOM, organic matterNMSU-PSRC, New Mexico State University Plant Sciences Research Center
Type
Research
Information
Weed Technology , Volume 16 , Issue 4 , December 2002 , pp. 833 - 837
Copyright
Copyright © Weed Science Society of America 

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