Herbicide rotation ineffective against resistance in waterhemp

(University of Illinois College of Agricultural, Consumer and Environmental Sciences) Farmers have been battling herbicide-resistant weeds for generations. A common practice for most of that time has been to rotate between different herbicides every season. But despite farmers' best efforts, herbicide resistance has grown through the years, with some weed populations showing resistance to not one but four or five different herbicides. A new study from the University of Illinois explains why herb...