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Absorption and translocation of glufosinate on four weed species

Published online by Cambridge University Press:  12 June 2017

Gregory J. Steckel ,
Stephen E. Hart  and
Loyd M. Wax
Gregory J. Steckel
Affiliation:
Department of Crop Science, University of Illinois, Urbana, IL 61801
Stephen E. Hart
Affiliation:
Department of Crop Science, University of Illinois, Urbana, IL 61801
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Abstract

Greenhouse and laboratory experiments were conducted to evaluate foliar absorption, translocation, and efficacy of glufosinate on four weed species. The rate of glufosinate required to reduce shoot dry weight by 50% (GR50) varied between weed species. GR50 values for giant foxtail, barnyardgrass, velvetleaf, and common lambsquarters were 69, 186, 199, and 235 g ai ha−1, respectively. Absorption of 14C-glufosinate increased with time and reached a plateau 24 hours after treatment (HAT). Absorption of 14C-glufosinate was 67, 53, 42, and 16% for giant foxtail, barnyardgrass, velvetleaf, and common lambsquarters, respectively. Translocation of absorbed 14C-glufosinate from the treated leaf was greatest for giant foxtail and barnyardgrass (15 and 14% 24 HAT of absorbed 14C-glufosinate, respectively). This compared to 5 and < 1% for translocation of absorbed 14C-glufosinate from the treated leaves of velvetleaf and common lambsquarters. The majority of 14C-glufosinate translocated by giant foxtail and barnyardgrass was found below the treated leaf and in the roots, indicating phloem mobility of the herbicide. Differential absorption and translocation of 14C-glufosinate may be contributing factors to the differential sensitivity observed between weed species.

Keywords

Glufosinate, 2-amino-4-(hydroxymethylphosphinyl) butanoic acidbarnyardgrass, Echinochloa crus-galli (L.) Beauv. ECHCGcommon lambsquarters, Chenopodium album L. CHEALgiant foxtail, Setaria faberi Herrm. SETFAvelvetleaf, Abutilon theophrasti Medikus ABUTHABUTHCHEALECHCGSETFA
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 45 , Issue 3 , June 1997 , pp. 378 - 381
Copyright
Copyright © 1997 by the Weed Science Society of America 

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