Rapidly spreading palmer amaranth is the headliner among a list of 16 types of weeds that have developed resistance to glyphosate, one of the most widely used herbicides. Says the New York Times, “Glyphosate-resistant palmers first surfaced in 2005, in a field in Macon County, Ga. Nine years later, they are in at least 24 states.” The Times describes how a farmer in northwestern Indiana struggles with the weed, using a variety of chemicals and hand-pulling the weed. Experts say options for farmers overall include adoption of other chemical weedkillers, tillage methods that turn more of the soil as a way to bury palmer seeds, and cover crops to choke out weeds when they germinate.