The blog on inconsistent dicamba performance on Palmer amaranth has caused some follow up questions.
Is there any difference between Engenia, Xtendimax and Clarity for actual Palmer amaranth control? NO. I know from repeated research with all three that they all perform fairly well on a 1 to 4” Palmer amaranth. They all often need follow up applications on Palmer that is larger than 4”.
Are PRE applied herbicides needed in Xtend soybeans? YES. The folks to date who have had issues with dicamba performance were not using any PRE applied herbicides. It is hard to get good coverage in those thick mats of pigweeds where PREs have not been used.