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Spray carrier pH effect on absorption and translocation of trifloxysulfuron in Palmer amaranth (Amaranthus palmeri) and Texasweed (Caperonia palustris)

Published online by Cambridge University Press:  20 January 2017

M. A. Matocha ,
L. J. Krutz ,
S. A. Senseman ,
C. H. Koger ,
K. N. Reddy  and
E. W. Palmer
L. J. Krutz
Affiliation:
Southern Weed Science Research Unit, Agricultural Research Service, U.S. Department of Agriculture, P.O. Box 350, Stoneville, MS 38776
S. A. Senseman
Affiliation:
Department of Soil and Crop Sciences, Texas Agricultural Experiment Station, Texas A&M University, College Station, TX 77843
C. H. Koger
Affiliation:
Crop Genetics and Production Research Unit, Agricultural Research Service, U.S. Department of Agriculture, P.O. Box 345, Stoneville, MS 38776
K. N. Reddy
Affiliation:
Southern Weed Science Research Unit, Agricultural Research Service, U.S. Department of Agriculture, P.O. Box 350, Stoneville, MS 38776
E. W. Palmer
Affiliation:
Syngenta Crop Protection, 118 Kennedy Flat Road, Leland, MS 38756
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Abstract

Spray carrier pH affects the solubility of sulfonylurea herbicides and, therefore, could affect absorption and subsequent translocation of these compounds in weeds. Trifloxysulfuron is a sulfonylurea herbicide developed for POST weed control in cotton, sugarcane, and turfgrass with a pKa of 4.81. The objective of this study was to evaluate the absorption and translocation of foliar-applied 14C-trifloxysulfuron in Palmer amaranth and Texasweed at pH 5, 7, and 9 over a period of 4 to 72 h after treatment (HAT). For absorption, effects of time, species, and pH were significant. Absorption averaged over species and pH increased logarithmically from 4 to 72 HAT. Absorption was greater for Palmer amaranth (88%) than for Texasweed (29%) when averaged over time and pH. Absorption averaged over species and time increased in the order of pH 5 (52%) < pH 9 (60%) = pH 7 (61%). Consequently, this translated into greater translocation of 14C-trifloxysulfuron in Texasweed when sprayed with the higher pH spray solutions. These data indicate that absorption and translocation of trifloxysulfuron in some weed species may be enhanced by increasing the pH of the spray solution by 2 pH units above the pKa.

Keywords

TrifloxysulfuronPalmer amaranth, Amaranthus palmeri S. Wats. AMAPATexasweed, Caperonia palustris (L.) St. Hil. CNPPASulfonylureapHpKaspray carrier
Type
Research Article
Information
Weed Science , Volume 54 , Issue 6 , December 2006 , pp. 969 - 973
Copyright
Copyright © Weed Science Society of America 

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