Absorption and translocation of glyphosate in aspen (Populus tremuloides Michx.) as influenced by droplet size, droplet number, and herbicide concentration

Authors

Shu Hua Liu
Robert A. Campbell
John A. Studens
Robert G. Wagner

Document Type

Article

Journal/Book Title/Conference

Weed Science

Volume

44

Issue

3

First Page

482

Last Page

488

Publication Date

1996

Abstract

When herbicide concentration was constant, absorption of ¹⁴C-glyphosate increased with increasing droplet size (326 to 977 μm). Amount of ¹⁴C-glyphosate translocated away from the treated area, expressed as percent of absorbed, increased as droplet size decreased. Herbicide concentration of the droplet was more important than droplet number or droplet size in determining glyphosate absorption and translocation. Absorption and translocation increased with increasing herbicide concentration regardless of whether droplet size or number was altered in conjunction with herbicide concentration. This relationship explained why low spray volume (increased herbicide concentration) increased herbicide efficacy. The concentration gradient between droplet and leaf, rather than droplet coverage, was the primary mechanism responsible for the observed effect. Large droplets caused localized tissue injury, which may have caused decreased translocation.

Recommended Citation

Liu, Shu Hua; Campbell, Robert A.; Studens, John A.; Wagner, Robert G. 1996. Absorption and Translocation of Glyphosate in Aspen (Populus tremuloides Michx.) as Influenced by Droplet Size, Droplet Number, and Herbicide Concentration. Weed Science. 44(3):482-488