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Surfactant Structure and Concentration Strongly Affect Rimsulfuron Activity

Published online by Cambridge University Press:  12 June 2017

Jerry M. Green  and
John H. Green
Jerry M. Green
Affiliation:
Agric. Prod., Stine-Haskell Res. Cent., DuPont Co., Newark, DE 19714
John H. Green
Affiliation:
Agric. Prod., Stine-Haskell Res. Cent., DuPont Co., Newark, DE 19714
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Abstract

A nonionic surfactant with the appropriate structure and concentration increased rimsulfuron activity 10-fold. Surfactants sharply increased rimsulfuron activity as concentration increased up to 0.05% (w/w) with slightly more enhancement up to 0.1% (w/w). Surfactants with a wide range of 14 chemical, physical, and surface properties were evaluated on giant foxtail, velvetleaf, and corn. Two properties, HLB (hydrophilic-lipophilic balance) and the physical form of the spray deposit, explained the biological variation. The most active surfactants had an HLB from 12 to 17 and formed a moist gel spray deposit on the leaf on all three species. A separate study with 13 chemically pure linear alcohol ethoxylates supported these conclusions and additionally showed that increasing molecular size increases activity. Because crop injury correlates with weed control, the best surfactant strategy is to maximize weed control at the lowest rimsulfuron rate.

Keywords

Rimsulfuron, N-[[(4,6-dimethoxy-2-[pyrimidinyl)amino]carbonyl]-3-(ethylsulfonyl)-2-pyridinesulfonamidecorn, Zea mays L.giant foxtail Setaria faberi Herrm. # SETFAvelvetleaf, Abutilon theophrasti Medik. # ABUTHMaizeDPX-E9636HLBethylene oxidespray depositmolecular weightsulfonylurea
Type
Research
Information
Weed Technology , Volume 7 , Issue 3 , September 1993 , pp. 633 - 640
Copyright
Copyright © 1993 by the Weed Science Society of America 

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