This project continues small plot research on herbicide-resistant weeds, including Palmer amaranth, horseweed (marestail), and the emerging problems of herbicide-resistant grassy weeds, including goosegrass, ryegrass, johnsongrass and barnyardgrass. The research assesses the best programs to control these troublesome weeds, using combinations of tillage, cover crops and herbicides with multiple modes of action. It also investigates the interaction of different traits and herbicides. At the same time, the project examines weed control failures on arms and elucidates if due to true herbicide resistance or some other factor. Efforts also consider if herbicide tolerance is developing to glufosinate, dicamba or 2,4-D.
Key Benefactors:
farmers, agronomists, extension agents