The Genetically Modified Alfalfa Scare: Don't Panic



The USDA's recent decision to (re)deregulate genetically modified (GM) alfalfa has sent a shock wave of panic through the organic foods industry. Samuel Fromartz explained to Food Channel readers how "the move has been opposed by organic farmers and consumers because of the strong possibility that genetically modified alfalfa will cross-pollinate non-GM alfalfa." In essence, organic growers (who produce between .5 and 1 percent of the nation's alfalfa) could have their product contaminated by gene flow from genetically modified seed and, as a result, have their hard-earned organic designation undermined. Of course, this seems terribly unfair.

I'm not a big supporter of alfalfa production, be it organic or conventional or genetically modified. In an age of declining agricultural resources and rising food prices, the decision to grow a feed crop for animals that convert a relatively small percentage of it into meat strikes me as inherently wasteful. (I make this point knowing that alfalfa is a nitrogen-fixing crop, meaning that it improves soil fertility.) That said, as I encountered one condemnatory article after another regarding Tom Vilsack's choice to deregulate GM alfalfa, I kept wondering what I often wonder when grappling with an agricultural controversy: where's the data? Fromartz (echoing the standard line) refers to the "strong possibility" of contamination.

With a contamination possibility that's less than 1 percent, we are not looking at a scenario in which GM alfalfa is going to overtake its organic counterpart.

Okay. How strong?

Dr. Dan Putnam, a forage expert at UC-Davis, has extensively researched this question. His work reminds those willing to dig deeper than the topical media reports that the matter at hand is far more complicated than it seems. Putnam explores rates of contamination based on alfalfa crop distance, types of pollinators, and adjacent systems of production (i.e., seed-to-seed, hay-to-seed, and hay-to-hay). In a 2008 study evaluating the chances of a Roundup Ready alfalfa seed crop contaminating a non-Roundup Ready hay crop (the seed-to-hay scenario), Putnam found that when the crops are a modest 160 feet apart the rate of successful gene flow from GM seed crop to non-GM hay crop was a mere 0.25 percent. (Hay-to hay, rather than seed-to-hay, is the most common situation—but the chances of contamination in that scenario appear to be even lower.)

Even if one-fourth of 1 percent seems too much, Putnam notes that the figure is an overstatement. In his study he purposefully allowed the non-GM hay crop to go to seed—something that must happen in order for pollinators (bees or leafcutters) to cross-pollinate from the GM seed crop. In the real agricultural world, however, a farmer growing alfalfa hay would almost never allow this to happen, thereby radically reducing the chance of contamination. Writing in The Progressive Farmer, agriculture reporter Chris Clayton (who, I must add, is one of the fairest—if lesser known— agricultural writers around) notes, "Hay is often cut multiple times each year before flowering occurs." So the GM seed pollen, should it wander into a neighboring field, would have nothing to grab onto.

There's more. Let's say that the non-GM hay did flower and produce seeds. Two more unlikely events would also have to happen in order for successful contamination to occur. 1. There would have to be simultaneous flowering between seed crop and hay crop in order for cross pollination between GM and non-GM to happen. And 2: If that rare coincidence took place, the seeds in the hay field contaminated with GM pollen would have to fall and germinate on-site rather than being carried afield by a puff of wind. There is, Putnam recently told a meeting of concerned farmers at the recent World Agriculture Expo, "a pretty low level of risk." (PDF)

Purists will argue that a "low level of risk is not enough." But seeking a zero-tolerance policy when it comes to contamination denies the reality of floral life. Pollen moves. To seek an absolute guarantee against contamination of any crop would be like driving a car while insisting that the manufacturer promise you'll never be harmed. Even so, with a contamination possibility that's less than 1 percent, we are not looking at a scenario in which GM alfalfa is going to overtake its organic counterpart.

A final and often overlooked point to consider is this: Even if the minimal odds were beaten, successful contamination did occur, and a bit of GM alfalfa were fed to a cow producing organic milk, the impact would be, for all intents and purposes, benign. The GM trait—glyphosate resistance—has been around for over a decade, it has been approved for both human and animal consumption, and it presents no pest problems. The organic industry already allows less than 5 percent of its crops to be contaminated with synthetic pesticide drift. So I think it's perfectly reasonable for organic alfalfa farmers to accept the extremely low (not "strong") chance of GM contamination as the cost of doing business in the modern world.

Presented by

James McWilliams is an associate professor of history at Texas State University, San Marcos, and author of Just Food: Where Locavores Get It Wrong and How We Can Truly Eat Responsibly.

Before Tinder, a Tree

Looking for your soulmate? Write a letter to the "Bridegroom's Oak" in Germany.

Join the Discussion

After you comment, click Post. If you’re not already logged in you will be asked to log in or register.

blog comments powered by Disqus


Before Tinder, a Tree

Looking for your soulmate? Write a letter to the "Bridegroom's Oak" in Germany.


The Health Benefits of Going Outside

People spend too much time indoors. One solution: ecotherapy.


Where High Tech Meets the 1950s

Why did Green Bank, West Virginia, ban wireless signals? For science.


Yes, Quidditch Is Real

How J.K. Rowling's magical sport spread from Hogwarts to college campuses


Would You Live in a Treehouse?

A treehouse can be an ideal office space, vacation rental, and way of reconnecting with your youth.

More in Health

From This Author

Just In