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| Web URL(s): | http://onlinelibrary.wiley.com/doi/10.1002/ps.2780380213/pdf
Last checked: 01/31/2014
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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| Publication Type:
| Refereed |
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| Author(s): | Gaskin, Robyn E.;
Stevens, Peter J. G. |
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| Author Affiliation: | New Zealand Forest Research Institute, Rotorua, New Zealand |
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| Title: | Antagonism of the foliar uptake of glyphosate into grasses by organosilicone surfactants: Part 1: Effects of plant species, formulation, concentrations and timing of application |
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| Source: | Pesticide Science. Vol. 38, No. 2/3, 1993, p. 185-192. |
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| Publishing Information: | Barking, Essex: Elsevier Science Publishers LTD |
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| # of Pages: | 8 |
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| Related Web URL: | http://onlinelibrary.wiley.com/doi/10.1002/ps.2780380213/abstract
Last checked: 01/31/2014
Notes: Abstract only |
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| Keywords: | TIC Keywords: Antagonism; Foliar feeding; Glyphosate; Nutrient uptake; Organosilicone; Product evaluation; Surfactants
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| Trade Names: | Silwet L-77 |
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| Abstract/Contents: | "Radiolabelled glyphosate was used to investigate the antagonistic effects of an organosilicone surfactant,Ā® 'Silwet' L-77ā¢, on the foliar uptake of the formulated herbicide into four grass species, over a 24-h time-course. While the effect of L-77 addition was generally to increase the initial rate of uptake of glyphosate, thereafter the rate was slowed or even halted, such that an overall decrease in uptake was evident as early as 4 h after application in one of the species tested. Further extensive studies on wheat investigated L-77 effects on uptake of the herbicide as both the pure mono-isopropylammonium salt, and as the formulated product containing a tallow amine polyethoxylate surfactant. The addition of L-77 initially increased, but after 1 h reduced the rate of glyphosate uptake, regardless of formulation. There was no evidence that antagonism resulted from any surfactant interaction between the organosilicone adjuvant and the tallow amine co-formulant. Antagonism was directly related to the concentration of L-77, and inversely related to that of the formulated herbicide and of its tallow amine co-formulant. Applied prior to glyphosate application, L-77 reduced the amount of herbicide in the foliage, and failed to increase substantially the initial rate of uptake. When applied after the a.i., instant enhancement of glyphosate uptake took place with some stomatal infiltration observed, but thereafter no significant cuticular penetration occurred. The mechanisms by which L-77 could interfere with the cuticular penetration of glyphosate are discussed in light of these results." |
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| Language: | English |
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| References: | 26 |
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| See Also: | See also: "Antagonism of the foliar uptake of glyphosate into grasses by organosilicone surfactants: Part 2: Effects of surfactant structure and glycerol addition." Pesticide Science, 38(2-3) 1993, p. 193-200 R=157020 R=157020 |
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| Note: | Figures
Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Gaskin, R. E., and P. J. G Stevens. 1993. Antagonism of the foliar uptake of glyphosate into grasses by organosilicone surfactants: Part 1: Effects of plant species, formulation, concentrations and timing of application. Pest Manage. Sci. 38(2/3):p. 185-192. |
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| Web URL(s):
http://onlinelibrary.wiley.com/doi/10.1002/ps.2780380213/pdf
Last checked: 01/31/2014
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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MSU catalog number: b2219665 |
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