There have been too many reports of Palmer amaranth escaping multiple applications of dicamba, Liberty and/or dicamba tankmixed with Liberty. Of course, we all have known for sometime that we have an ever-spreading biotype of dicamba-resistant Palmer amaranth in West Tennessee. Liberty on the other hand has been much more consistent controlling pigweed. Until it wasn’t. Continue reading
Reports of Palmer amaranth escaping dicamba and/or glufosinate have been common the last couple of days. Based on our recent research this is not a surprise as we have field and greenhouse studies showing that some Tennessee populations cannot be controlled with either herbicide (Figure 1).
Continue reading
Palmer amaranth remains one of the most difficult weeds to manage, and when pigweed escapes preemergence control, postemergence decisions can quickly turn into a kitchen sink approach where multiple products are added to the tank. Because postemergence options depend on the crop system and trait technology, we evaluated a wide range of postemergence programs in 2025 to better understand overall control trends. Continue reading
Pigweed problems are nothing new for growers across the region. With Palmer amaranth having confirmed resistance to five herbicide modes of action in Tennessee, control options continue to be limited. Historically, bleacher (Group 27 HPPD inhibitors) applications have provided sufficient control, especially in corn. In recent years, there has been growing concern for the level of control observed when using these products. Continue reading