Pat Westhoff, the director of the Food and Agricultural Policy Research Institute (FAPRI) at the University of Missouri says programs like this have become a big chunk of a farmer’s net farm income.

As the application window is closing, what's left to be sprayed in your area?

“Petitioners’ motion to ‘Enforce this Court’s Vacatur and to Hold EPA in Contempt,’ is a thinly-veiled attempt to revive arguments the court already rejected or declined to reach. It should be denied,” EPA said in court documents.

"They are driven right now primarily by a fear; fear of shortages," says Arlan Suderman of INTL FCStone.

Ten additional herbicides, four additional insecticides and one additional fungicide from FMC have been approved by the EPA as tank-mix partners for Enlist Duo herbicide.