1. Herbicide options for resistant ragweed.
University of Minnesota
Research from the University of Minnesota offers options for resistant giant ragweed when using pre and post herbicides with different sites of action, applied at a timely manner.
In this study, the most durable weed control was the Liberty system that used a preemergence herbicide (effective on giant ragweed) application followed by timely (2 inch weeds) post application(s), since weed species other than giant ragweed also needed to be controlled. In addition to good weed control, it also had among the lowest herbicide injury ratings throughout the season
Read more about the research and get tips for successful weed control.