Editing Roundup (herbicide) (section)

==Composition==
Glyphosate-based formulations may contain a number of [[Agricultural spray adjuvant|adjuvants]], the identities of which may be proprietary.<ref name="www2.epa.gov">{{cite web |url=http://www2.epa.gov/pesticide-registration/pesticide-registration-manual |title=Pesticide Registration Manual &#124; Pesticide Registration &#124; US EPA |date=March 4, 2013 |access-date=August 19, 2022 |archive-date=April 14, 2016 |archive-url=https://web.archive.org/web/20160414065403/https://www.epa.gov/pesticide-registration/pesticide-registration-manual |url-status=dead }}</ref> Surfactants are used in herbicide formulations as [[wetting]] agents, to maximize coverage and aid penetration of the herbicide(s) through plant leaves. As agricultural spray adjuvants, surfactants may be pre-mixed into commercial formulations or they may be purchased separately and mixed on-site.<ref>{{cite web |title=Adjuvants for Enhancing Herbicide Performance |url=https://extension.psu.edu/adjuvants-for-enhancing-herbicide-performance |website=extension.psu.edu |publisher=Penn State Extension |access-date=15 August 2018 |language=en}}</ref>

[[Polyethoxylated tallow amine]] (POEA) is a surfactant used in the original Roundup formulation and was commonly used in 2015.<ref name=usgs.glyphosate.poea>{{cite web|title=Measuring POEA, a Surfactant Mixture in Herbicide Formulations|url=http://toxics.usgs.gov/highlights/glyphosate_poea.html|publisher=U.S. Geological Survey|access-date=August 19, 2022|archive-date=October 7, 2015|archive-url=https://web.archive.org/web/20151007051906/http://toxics.usgs.gov/highlights/glyphosate_poea.html|url-status=dead}}</ref> Different versions of Roundup have included different percentages of POEA. A 1997 US government report said that Roundup is 15% POEA while Roundup Pro is 14.5%.<ref name="fs.fed.us"/> Since POEA is more toxic to fish and amphibians than glyphosate alone, POEA is not allowed in aquatic formulations.<ref name="Langeland"/><ref name="fs.fed.us">Gary L. Diamond and Patrick R. Durkin February 6, 1997, under contract from the United States Department of Agriculture. [http://www.fs.fed.us/foresthealth/pesticide/pdfs/Surfactants.pdf Effects of Surfactants on the Toxicity of Glyphosate, with Specific Reference to RODEO]</ref><ref name=Mann/>

Non-glyphosate formulations of Roundup are typically used for lawns that glyphosate would otherwise kill. Both type of products being sold under the Roundup brand name can be a source of confusion for consumers.<ref name="MSUExt"/> Active ingredients for non-glyphosate formulations of Roundup can include [[MCPA]], [[quinclorac]], [[dicamba]], and [[sulfentrazone]], [[penoxsulam]], and [[2,4-D]]<ref name="UNLExt"/><ref name="MSUExt"/>