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Influence of Adjuvants on Itchgrass (Rottboellia cochinchinensis) Control in Corn (Zea mays) with Nicosulfuron and Primisulfuron1

Published online by Cambridge University Press:  20 January 2017

Ronald E. Strahan ,
James L. Griffin ,
David L. Jordan  and
Donnie K. Miller
Ronald E. Strahan
Affiliation:
Louisiana Cooperative Extension Service, 252 Knapp Hall, Baton Rouge, LA 70803
James L. Griffin*
Affiliation:
Department of Plant Pathology and Crop Physiology, Louisiana State University Agricultural Center, 302 Life Sciences Building, Baton Rouge, LA 70803
David L. Jordan
Affiliation:
Northeast Research Station, P.O. Box 438, St. Joseph, LA 71366
Donnie K. Miller
Affiliation:
Northeast Research Station, St. Joseph, LA 71366
*
Corresponding author's E-mail: [email protected].
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Abstract

In field experiments, nicosulfuron at 35 g ai/ha controlled itchgrass in corn 28 d after treatment better than primisulfuron at 39 g ai/ha (80 vs. 44%). Control with both herbicides was greater when applied to six-leaf itchgrass than to 10-leaf and with the addition of nonionic surfactant than with an organosilicone surfactant and methylated seed oil blend. Weed control for nicosulfuron plus nonionic surfactant resulted in corn yield approximately 1.5 times that of primisulfuron plus nonionic surfactant and 1.6 times that of nicosulfuron plus an organosilicone surfactant and methylated seed oil blend. When primisulfuron was applied with organosilicone surfactant and methylated seed oil rather than nonionic surfactant, corn yield was reduced by 25%. For nicosulfuron with nonionic surfactant, corn yield averaged approximately twice that of the nontreated check. In other field experiments, itchgrass control 28 d after treatment with nicosulfuron was enhanced with addition of an organosilicone and nonionic surfactant blend or methylated seed oil (83 and 78%, respectively) compared with nonionic surfactant (69%). Nicosulfuron was less effective when applied with crop oil concentrate or organosilicone surfactants compared with nonionic surfactant.

Keywords

Nicosulfuron, 2-[[[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]-N,N-dimethyl-3-pyridinecarboxamideprimisulfuron, 2-[[[[[4,6-bis(difluoromethoxy)-2-pyrimidinyl]amino]carbonyl]amino]sulfonyl]benzoic aciditchgrass, Rottboellia cochinchinensis (Lour.) W. Clayton # ROOEXcorn, Zea mays L. ‘DeKalb 689’Crop oil concentratemethylated seed oilnonionic surfactantorganosilicone surfactantROOEXDAT, days after treatmentPOST, postemergencePRE, preemergence
Type
Research
Information
Weed Technology , Volume 14 , Issue 1 , March 2000 , pp. 66 - 71
Copyright
Copyright © Weed Science Society of America 

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Footnotes

1 Published with approval of the Vice Chancellor and Director of Research, Louisiana Agricultural Experiment Station, as manuscript 99-38-0401. Research was conducted in partial fulfillment of requirements for the M.S. degree in Weed Science at Louisiana State University.
Current address: Crop Science Department, Box 7620, North Carolina State University, Raleigh, NC 27695-7620

References

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