Weed scientists have long recommended not applying the same herbicides twice in a row.

Research at the University of Tennessee is indicating there’s another good reason to change chemistries even when they’re in dicamba-resistant crops.

The University of Tennessee’s Larry Steckel explained why in a presentation at The Pesticide Stewardship Alliance Conference in Memphis, Tenn., earlier this year.

See: Resistant grasses adding to farmers’ herbicide woes

See: 'We can't discard any tools for pigweed'