One of the best options has been to tank-mix herbicides with different mechanisms of action (MOAs) to control susceptible and resistant populations of weeds. Tan mixes can allow for control of multiple weed types, such as grasses, sedges, broad-leaved weeds, etc., depending on the chemicals chosen. Using multiple MOAs in an application reduces the frequency of resistance, as compared to rotating herbicide MOAs seasonally. Weeds with multiple MOA resistance do exist, so the mixes sprayed need to include herbicides with multiple and different MOAs that are effective on any herbicide-resistant weeds present.
|Stanley Culpepper conducting an herbicide application in a trial to determine the levels of herbicide resistance in Palmer amaranth. Image by Joseph LaForest, University of Georgia, Bugwood.org|