GM-resistant corn rootworm: getting the facts straight

guest blog

by Robert Wager

The segment GM-Resistant Rootworms and the Future of Farming was aired on May 29th on CBC’s The Current. The program reviewed a particular type of genetically modified crop – Bt corn – and how it has performed over time. The program had several guest speakers with differing points of view.  It was an interesting program overall, but there were a few keys facts missing:

  1. GM-resistant corn rootworms have been found in less than 1% of US corn fields so the context/scale of the problem was not made clear on the program (for more on this see the Biopesticides and Pollution Prevention Division (BPPD) IRM team’s review of Monsanto’s Cry3Bb1 resistance monitoring data (EPA-HQ-OPP-2011-0922-0037) (2010), Table 2).
  2. Integrated pest management (IPM) can include organic production methods if they are deemed best for a given farming situation. The suggestion that IPM is separate from organic farming is simply not true.
  3. The suggestion that only organic farming practices enhance soil ecology is blatantly false.  The National Academy of Science 2010 report, Impact of GE crops on farm Sustainability in the US stated farmers who have adopted GE crop technology have seen “substantial economic and environmental benefits.”  The organic farmer spokesperson on the program ignores this fact.  A good example is the well documented soil enhancements that are made possible with reduced/no tillage farming that Roundup Ready crops permit.  Tilling for weeds (the organic option) is quite destructive to soil structure.
  4. Organic agriculture is not chemical free. They use a different set of chemicals (coppers, sulfates). The environmental impact quotient (EIQ) for some of the organic alternatives is far higher (more negative impact on the environment) than conventional or biotechnology counterparts.
  5. The significant yield drag for organic agriculture is not mentioned by the organic production advocate.  On average decades of research show a 15-30% yield reduction for organic crop production (see Alex Avery’s book The Truth About Organic Foods (2006)).  This would have a very significant impact on food prices and farmer incomes.
  6. There was no mention that organic agriculture use the same Bt that was the main topic of the show. Organic crop advocates often vilify Bt in GM crops and then use the very same Bt in their own agricultural practices.  Where was that fact in the discussion?
rootworm damage NDSU

Source: North Dakota State U http://www.ag.ndsu.edu/

Having outlined a few shortcomings of the show’s content, I would like to congratulate the panel on the The Current’s program for shedding light on the need for better IPM practices in farming.  No one system of agriculture will solve all of the problems inherent in food production.  The world will need to double food production by 2050 and for that we require many systems of agricultural production in order to address the challenge.

Robert Wager
Vancouver Island University
Nanaimo BC
robert.wager@viu.ca

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rob wager 1

Robert Wager has been a faculty member of the Biology Dept at Vancouver Island University for the past 18 years.  He has a BSc. in Microbiology and a Masters in Biochemistry and Molecular Biology.  Rob has been interested in Genetically Modified (GM) crops and food with emphasis on public education and public policy.  He has written dozens of mainstream articles for the general public that help explain different aspects of the technology.  You can follow Rob on Twitter @RobetWager1 or review his work at: http://web.viu.ca/wager

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