By Dan Nosowitz
Dicamba has been in use as a local pesticide for decades, but it's only recently that Monsanto has taken to using it in big, new ways. The past two years have seen the rollout of dicamba-resistant seed for soybean and cotton, as well as a new way to apply it: broad spraying.
But dicamba, it turns out, has a tendency to vaporize and drift with the wind, and it if lands on a farm that hasn't planted Monsanto's dicamba-resistant seed, the pesticide will stunt and kill crops in a very distinctive way, with a telltale cupping and curling of leaves, as seen above. Drift from dicamba has affected millions of acres of crops, prompting multiple states to issue temporary bans on the pesticide. Farmers have been taking sides, either pro-dicamba or anti, and at least one farmer has been killed in a dispute over its use.