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'Superweeds' linked to rising herbicide use in GM crops, study finds

Date:
October 2, 2012
Source:
Washington State University
Summary:
The use of herbicides in the production of three genetically modified herbicide-tolerant crops -- cotton, soybeans and corn -- has actually increased, according to a new study. This counterintuitive finding is based on an exhaustive analysis of publicly available data.

Charles Benbrook has found that the use of herbicides in the production of three genetically modified herbicide-tolerant crops - cotton, soybeans and corn - has actually increased.
Credit: Image courtesy of Washington State University

A study published this week by Washington State University research professor Charles Benbrook finds that the use of herbicides in the production of three genetically modified herbicide-tolerant crops -- cotton, soybeans and corn -- has actually increased.

This counterintuitive finding is based on an exhaustive analysis of publicly available data from the U.S. Department of Agriculture's National Agriculture Statistics Service. Benbrook's analysis is the first peer-reviewed, published estimate of the impacts of genetically engineered (GE) herbicide-resistant (HT) crops on pesticide use.

In the study, which appeared in the open-access, peer-reviewed journal Environmental Sciences Europe, Benbrook writes that the emergence and spread of glyphosate-resistant weeds is strongly correlated with the upward trajectory in herbicide use. Marketed as Roundup and other trade names, glyphosate is a broad-spectrum systemic herbicide used to kill weeds. Approximately 95 percent of soybean and cotton acres, and more than 85 percent of corn, are planted to varieties genetically modified to be herbicide resistant.

"Resistant weeds have become a major problem for many farmers reliant on GE crops, and they are now driving up the volume of herbicide needed each year by about 25 percent," Benbrook said.

The annual increase in the herbicides required to deal with tougher-to-control weeds on cropland planted to GE cultivars has grown from 1.5 million pounds in 1999 to about 90 million pounds in 2011.

Herbicide-tolerant crops worked extremely well in the first few years of use, Benbrook's analysis shows, but over-reliance may have led to shifts in weed communities and the spread of resistant weeds that force farmers to increase herbicide application rates (especially glyphosate), spray more often and add new herbicides that work through an alternate mode of action into their spray programs.


Story Source:

The above story is based on materials provided by Washington State University. The original article was written by Brian Clark. Note: Materials may be edited for content and length.


Journal Reference:

  1. Charles M Benbrook. Impacts of genetically engineered crops on pesticide use in the U.S. -- the first sixteen years. Environmental Sciences Europe, 2012, 24:24 DOI: 10.1186/2190-4715-24-24

Cite This Page:

Washington State University. "'Superweeds' linked to rising herbicide use in GM crops, study finds." ScienceDaily. ScienceDaily, 2 October 2012. <www.sciencedaily.com/releases/2012/10/121002092839.htm>.
Washington State University. (2012, October 2). 'Superweeds' linked to rising herbicide use in GM crops, study finds. ScienceDaily. Retrieved April 18, 2014 from www.sciencedaily.com/releases/2012/10/121002092839.htm
Washington State University. "'Superweeds' linked to rising herbicide use in GM crops, study finds." ScienceDaily. www.sciencedaily.com/releases/2012/10/121002092839.htm (accessed April 18, 2014).

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