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  • Janet Carpenter's picture
    Janet Carpenter
    The answer to your question about the impact of GM crops on pesticide use depends on which trait you are talking about. For insect resistant crops, such as corn and cotton, it is widely accepted that insecticide use has decreased as a direct result of the adoption of GM crops. This makes sense because the insect resistance traits control pests that farmers had been using conventional insecticides to control previously. What might be surprising is that insecticide use is reduced for farmers who plant insect resistant GM crops as well as those who don't, because the widespread planting of insect resistant corn and cotton have led to decreased target insect pest populations overall. For herbicide resistant crops, such as soybeans, corn and cotton, the impact has been that farmers substituted glyphosate (primarily) for other herbicides. Because glyphosate has a more benign environmental profile than other commonly used herbicides, the impact on the environment has been favorable. All that said, in recent years, several weed species have developed resistance to glyphosate and many growers have begun to use additional herbicides in their weed control programs. Overall, the mix of herbicides used today is still preferable environmentally to what was being used before herbicide resistant crops were introduced, and what they might be doing today if herbicide resistant crops were never introduced, as growers face weeds with resistance to other commonly used herbicides, a problem which certainly would have become worse without the introduction of herbicide resistant crops. (For more information, see this recent report from USDA: Genetically Engineered Crops in the United States: http://www.ers.usda.gov/publications/err-economic-research-report/err162.aspx#.UxC_mfldUUi.)
  • Community Manager's picture
    Community Manager
    @Truth Please, you might be interested in a few other Q&As on GMO Answers regarding your comment. According to Dr. Bruce Chassy, professor emeritus of food safety and nutritional sciences at the University of Illinois at Urbana-Champaign, “GM crops have been planted on more than 2 billion hectares by more than 17 million farmers over 17 years in about 30 countries with no adverse ecological impacts observed. Fair-to-say, that’s a pretty robust long-term study!” (You can read the full response here: http://gmoanswers.com/ask/are-there-any-long-term-30-years-studies-done-full-spectrum-ecological-impact-transgenic-gmo.) You can also find a list of several, but not all, organizations that support GMOs, including the National Academy of Sciences and World Health Organization here: http://gmopundit.blogspot.com/p/450-published-safety-assessments.html. Consumers have a variety of food choices in the marketplace, and many food producers voluntarily label foods containing non-GM ingredients. According to Greg Conko, senior fellow at the Competitive Enterprise Institute, “Some consumers wish to avoid foods with genetically engineered ingredients, so food producers have increasingly responded to this market demand by labeling food products that do not contain them. There are many thousands of voluntarily labeled, non-GE foods available in grocery stores throughout the country, in stores as varied as Whole Foods Markets and Wal-Mart. From just 2000 to 2009, nearly 7,000 new food and beverage products were introduced in the United States with explicit non-GE labeling. And those numbers continue to grow.” (His full response, which also discusses FDA labeling guidelines, is available here: http://gmoanswers.com/ask/why-it-vast-insurmountable-demand-consumers-have-not-been-simply-given-what-they-ask-gmo.) Please feel free to ask a question at http://www.gmoanswers.com/ask. We welcome your discussion and participation throughout the site!
  • Truth Please's picture
    Truth Please
    First of all, thank you for your response.

    Secondly, if the findings from the study I linked are misleading that certainly is sad, as I never like to see researchers stooping to the level of the industry which they are trying to discredit.

    Your answer also does not make me feel any better about GM crops. You did not address that pesticide use has increased in North American GM crops, which I might add seems quite convenient (conflict of interest?) for a certain company that happens to produce both GM seeds and pesticides. That is quite a business plan. Has the use of pesticides NOT increased in GM crops?

    Furthermore, I am not opposed to researching the potential impact of GM crops in developing countries, but I am of the opinion that everybody has the right to know that what they are consuming has been genetically modified. There is no 'proof' that GMO's will not cause long-term health problems. The ONLY way to know is to wait 10/20/30 years. I'm not willing to take that chance for myself or my family, especially since GMO's are not necessary and can be avoided by buying only organic items. I take exception to those who consider a GM crop to be "Natural". Altering the genetic makeup of anything is NOT natural.

    I would bet my life savings that someone who eats only locally grown/raised organic foods is healthier than someone who eats foods containing GMO's. Even if it is not local, it is still possible to buy only organic foods. It makes me feel much better to support organic farmers too.
  • Joseph Najjar's picture
    Joseph Najjar
    I'm sure the experts will have better information than I found, but looking at the study, I was wondering why he chose the time frames he did. Here is an interesting link I found, shortly after.

    "Heinemann and colleagues have chosen to drawn conclusions of no beneficial yield impact of GM technology in North America by using a comparison period starting in 1986 which is ten years away from the actual start date. In their paper, they give no clear justification for using this start year, and ignore the relevant start point for GM introduction that occurred a decade into their 1986-2011 comparison period.
    On the other hand, if they had used the right comparison time period, they might have picked up this interesting observation noted by Chris Preston"


    You'll need to go to the link to see the figures that pertain to the years that GM crops were actually commercialized. This is just a great example of how data can say whatever you want it to say. Dilute the modern yield gains down with yields before the technology was released??? pretty sneaky.....
  • Community Manager's picture
    Community Manager
    This is a great question and we're going to get to it as soon as we can. Due to the high volume, we're using the "vote" feature to prioritize which questions get addressed first. We encourage you to "vote" for your question. We'll route it to the right person just as soon as we can. For more information about how this conversation is moderated, visit our house rules: http://gmoanswers.com/house-rules.