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'''Glyphosate Resistant Weeds''' are weeds that have the evolved the ability to withstand [[glyphosate]], the active ingredient in [[Monsanto]]'s herbicide [[Roundup]]. The evolution of Roundup-resistance in weeds is often linked to the use of [[genetically engineered]] [[Roundup Ready Crops]]. For example, between 1996 and 2006, the amount of glyphosate applied per planted acre of soybeans in the U.S. increased from less than 0.2 to about 1.2 pounds, a six-fold increase.
[http://oversight.house.gov/wp-content/uploads/2012/01/20100728Owen.pdf Testimony of Michael Owen], "Are ‘Superweeds’ an Outgrowth of USDA Biotech Policy? (Part I)," Hearing, Committee on Oversight and Government Reform, U.S. House of Representatives, July 28, 2010.
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'''Glyphosate Resistant Weeds''' are weeds that have the evolved the ability to withstand [[glyphosate]], the active ingredient in [[Monsanto]]'s herbicide [[Roundup]].
The [[Weed Science Society of America]] (WSSA) defines weed resistance as "the inherited ability of a plant to survive and reproduce following exposure to a dose of herbicide normally lethal to the wild type."
Charles Benbrook, "[http://www.organic-center.org/reportfiles/13Years20091126_FullReport.pdf Impacts of Genetically Engineered Crops on Pesticide Use: The First Thirteen Years]" and [http://www.organic-center.org/reportfiles/SupplementalTablesv2.pdf Supplemental Tables], The Organic Center, 2009.
The evolution of Roundup-resistance in weeds is often linked to the use of [[genetically engineered]] [[Roundup Ready Crops]]. For example, between 1996 and 2006, the amount of glyphosate applied per planted acre of soybeans in the U.S. increased from less than 0.2 to about 1.2 pounds, a six-fold increase.
[http://oversight.house.gov/wp-content/uploads/2012/01/20100728Owen.pdf Testimony of Michael Owen], "Are ‘Superweeds’ an Outgrowth of USDA Biotech Policy? (Part I)," Hearing, Committee on Oversight and Government Reform, U.S. House of Representatives, July 28, 2010.
:"The first GR weed in row crops identified in the US was horseweed [Conyza canadensis (L.) Cronq.], and its appearance was possibly correlated with the cultivation of GR soybeans. Recently other GR weed populations have been reported... All these weeds are major economic problems in agronomic crops in the corn, cotton and soybean growing regions of the US and the distribution of glyphosate resistance in these weeds is increasing. GR horseweed is now wide-spread throughout much the US cropland."
[http://oversight.house.gov/wp-content/uploads/2012/01/20100728Weller.pdf Testimony of Stephen Weller], Professor of Horticulture, Purdue University, "[http://oversight.house.gov/hearing/are-superweeds-an-outgrowth-of-usda-biotech-policy-part-i/ Are ‘Superweeds’ an Outgrowth of USDA Biotech Policy? (Part I)]," Hearing, Committee on Oversight and Government Reform, [[U.S. House of Representatives]], July 28, 2010.
:"The first GR weed in row crops identified in the US was horseweed [Conyza canadensis (L.) Cronq.], and its appearance was possibly correlated with the cultivation of GR soybeans. Recently other GR weed populations have been reported... All these weeds are major economic problems in agronomic crops in the corn, cotton and soybean growing regions of the US and the distribution of glyphosate resistance in these weeds is increasing. GR horseweed is now wide-spread throughout much the US cropland."
[http://oversight.house.gov/wp-content/uploads/2012/01/20100728Weller.pdf Testimony of Stephen Weller], Professor of Horticulture, Purdue University, "[http://oversight.house.gov/hearing/are-superweeds-an-outgrowth-of-usda-biotech-policy-part-i/ Are ‘Superweeds’ an Outgrowth of USDA Biotech Policy? (Part I)]," Hearing, Committee on Oversight and Government Reform, [[U.S. House of Representatives]], July 28, 2010.