With waterhemp, Palmer amaranth and other yield-robbing thugs lurking in fields across Iowa, a new generation of crop protection products promises to help growers win the war on tough weeds.

You’ve probably heard about next-level weed control in soybeans, now that two dicamba products are labeled, including Engenia herbicide from BASF and XtendiMax from Monsanto. Another new option is Enlist Duo herbicide, which combines a new 2,4-D...