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Absorption and Translocation of Glyphosate in Aspen (Populus tremuloides Michx.) as Influenced by Droplet Size, Droplet Number, and Herbicide Concentration

Published online by Cambridge University Press:  12 June 2017

Shu Hua Liu ,
Robert A. Campbell ,
John A. Studens  and
Robert G. Wagner
Shu Hua Liu
Affiliation:
Can. For. Serv., Box 490, Sault Ste. Marie, ON, Canada P6A 5M7
Robert A. Campbell
Affiliation:
Can. For. Serv., Box 490, Sault Ste. Marie, ON, Canada P6A 5M7
John A. Studens
Affiliation:
Can. For. Serv., Box 490, Sault Ste. Marie, ON, Canada P6A 5M7
Robert G. Wagner
Affiliation:
Ont. For. Res. Inst., Box 969, Sault Ste. Marie, ON, Canada P6A 5N5
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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.

Keywords

Glyphosate, N-(phosphonomethyl) glycineaspen, Populus tremuloides Michx.♯ POPTMEfficacydroplet generatorforest weeddrop sizespray volume
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 44 , Issue 3 , September 1996 , pp. 482 - 488
Copyright
Copyright © 1996 by the Weed Science Society of America 

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