The problem in AR & MO essentially stems from Monsanto's new version of dicamba that's supposed to reduce a lot of this overspray damage not yet being approved by the EPA, so growers have decided to just spray the old stuff that's known to cause this kind of damage despite being told not to.
“The conflict was no longer farmer versus weed, but also farmer versus farmer. When his neighbors illegally sprayed the pesticide, Wallace reported it. After harvest, Wallace was shot and killed.
On today's show, a murder mystery – about how a weed divided neighbors and led to Mike Wallace's death.”
http://www.npr.org/sections/thesalt/2016/08/01/487809643/cri...