Iowa State University

Weed Killer Dicamba Eyed In Oak Tree Damage Across Iowa, Illinois And Tennessee

Oct 11, 2017
Lou Nelms, a retired biologist, stands next to an oak tree in Atlanta, Illinois, that may have been damaged by herbicide drift.
Darrell Hoemann / The Midwest Center for Investigative Reporting

As soybean and cotton farmers across the Midwest and South continue to see their crops ravaged from the weed killer dicamba, new complaints have pointed to the herbicide as a factor in widespread damage to oak trees.

Monsanto and BASF, two of agriculture’s largest seed and pesticide providers, released versions of the dicamba this growing season. The new versions came several months after Monsanto released its latest cotton and soybean seeds genetically engineered to resist dicamba in 2016. Since then, farmers across the Midwest and South have blamed drift from dicamba for ruining millions of acres of soybeans and cotton produced by older versions of seeds.

Now, complaints have emerged that the misuse of dicamba may be responsible for damage to oak trees in Iowa, Illinois and Tennessee.

Emerging prairie strips on Iowa farms.
Christopher Gannon / Courtesy Iowa State University

A new study says small patches of native prairie plants provide a range of conservation benefits to Iowa’s landscape and could reduce water pollution from farm fields.

A study that received funding from the Leopold Center demonstrated that including small grains, such as the oats pictured here in 2016, in field rotations can reduce the need for chemical inputs.
Amy Mayer / Harvest Public Media

A leading research center focused on local farmers and environmental conservation is hanging on by a thread, even as the movement to diversify agriculture, which it helped launch, continues to thrive.

Iowa State University students Liz Hada, left, and Melissa Garcia Rodriguez say they have experienced racial tension in some of their classes.
Amy Mayer / Harvest Public Media

Farmers in the U.S. like to point out that their products feed people all over the world. And while this is a diverse country, the people working on farms and elsewhere in agriculture often don’t reflect the nation’s demographics. Changing that is becoming a priority, in hopes new people will bring fresh ideas to meet some of our food system’s greatest challenges.