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

  • M. A. Matocha, L. J. Krutz (a1), S. A. Senseman (a2), C. H. Koger (a3), K. N. Reddy (a1) and E. W. Palmer (a4)...

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.

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Corresponding author

Corresponding author. Agricultural and Environmental Safety, Texas Cooperative Extension, 115 Agronomy Field Lab, College Station, TX 77843-2488; ma-matocha@tamu.edu

References

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Keywords

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

  • M. A. Matocha, L. J. Krutz (a1), S. A. Senseman (a2), C. H. Koger (a3), K. N. Reddy (a1) and E. W. Palmer (a4)...

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