Where weedkiller won’t work: Farmers’ wide use of Roundup, also known as glyphosate, a popular herbicide, has led to the spread of Roundup-resistant weeds across the country. At least 10 species of Roundup-resistant weeds have infested millions of acres in 22 states since 2000. Source: International Survey of Herbicide Resistant Weeds. The New York Times

By WILLIAM NEUMAN and ANDREW POLLACK
Published: May 3, 2010 DYERSBURG, Tenn. — For 15 years, Eddie Anderson, a farmer, has been a strict adherent of no-till agriculture, an environmentally friendly technique that all but eliminates plowing to curb erosion and the harmful runoff of fertilizers and pesticides. But not this year. On a recent afternoon here, Mr. Anderson watched as tractors crisscrossed a rolling field — plowing and mixing herbicides into the soil to kill weeds where soybeans will soon be planted. Just as the heavy use of antibiotics contributed to the rise of drug-resistant supergerms, American farmers’ near-ubiquitous use of the weedkiller Roundup has led to the rapid growth of tenacious new superweeds. To fight them, Mr. Anderson and farmers throughout the East, Midwest and South are being forced to spray fields with more toxic herbicides, pull weeds by hand and return to more labor-intensive methods like regular plowing. “We’re back to where we were 20 years ago,” said Mr. Anderson, who will plow about one-third of his 3,000 acres of soybean fields this spring, more than he has in years. “We’re trying to find out what works.” Farm experts say that such efforts could lead to higher food prices, lower crop yields, rising farm costs and more pollution of land and water. “It is the single largest threat to production agriculture that we have ever seen,” said Andrew Wargo III, the president of the Arkansas Association of Conservation Districts. The first resistant species to pose a serious threat to agriculture was spotted in a Delaware soybean field in 2000. Since then, the problem has spread, with 10 resistant species in at least 22 states infesting millions of acres, predominantly soybeans, cotton and corn. …

Farmers Cope With Roundup-Resistant Weeds