The problem for corn farmers is that «superweeds» have been developing resistance to America’s best-selling herbicide Roundup, which is being sprayed on millions of acres in the Midwest and elsewhere.
Dow Agrosciences has developed a strain of corn that it says will solve the problem. The new genetically modified variety can tolerate 2,4-D, which will kill off the Roundup-resistant weeds, but leave the corn standing. Farmers who opt into this system will be required to double-dose their fields with a deadly cocktail of Roundup plus 2,4-D, both of which are manufactured by Monsanto.
Large-scale industrial farming has grown dependent on ever-increasing applications of agrochemicals. Some have compared this to a drug addict who requires larger and larger fixes to stay high. Herbicide use has increased steadily over time as weeds develop resistance and need to be doused with more and deadlier chemicals to kill them. This, in turn. requires more aggressive genetic engineering of crops that can withstand the escalating chemical assault.
Many agricultural scientists warn that this growing addiction to agrochemicals is unsustainable in the long run. The fertility of the soil decreases as earthworms and vital microorganisms are killed off by pesticides and herbicides. They also pollute the groundwater and compromise the health of farm animals that are fed with the chemical-infused grain.
These impacts are poised to grow. US Department of Agriculture (USDA) figures reveal that herbicide use rose by 383 million pounds from 1996 to 2008. Significantly, nearly half of this increase (46 percent) took place between 2007 and 2008 as a result of the hawking of new herbicide-resistant crops like the new corn hybrid developed by Dow.
Until recently, herbicide-resistant crops were popular with farmers who benefited from higher yields and nearly effortless management of weeds. But now that the weed problem is coming back with a vengeance, some are reconsidering the wisdom of this chemical-intensive mode of farming. Dow biotech corn costs nearly three times more than conventional seed. And the projected doubling of pesticide use in the years ahead will be expensive, as well as destructive to farmland and ecosystems.
There are viable alternatives to chemical-intensive farming, time-tested methods like crop rotation, use of cover crops, and other practices which allow farmers to compete naturally with weeds. The time has come for farmers to revive the knowledge of their ancestors in this regard.