Brent Henderson harvests soybeans on his farm near Weona, Ark., in 2017. That crop showed symptoms of dicamba exposure. Henderson switched to Xtend soybeans the following year, he says, as “insurance” against future damage.

Brent Henderson harvests soybeans on his farm near Weona, Ark., in 2017. That crop showed symptoms of dicamba exposure. Henderson switched to Xtend soybeans the following year, he says, as “insurance” against future damage.