Daver
PMA Member
To be clear, when I think of "sucker" I think of the type of new growth on above ground limbs that one would find after pruning say an apple tree. What I have seen with locusts that are simply sawn down is that there will LOTS of new shoots coming out of the ground adjacent to the sawn tree. These are new shoots coming up out of the ground from the "orphaned" root system of the "not dead yet" tree.they will sucker all over the place
When you cut a locust that you do not want...you want to kill it dead, like with Tordon on the stump dead. Or you will get zillions of "volunteer" new shoots. Now then, I have also really restricted where and how I use Tordon, because that stuff is serious about killing the root system of the applied tree, INCLUDING any below ground, intermingled roots of adjacent species that you want to preserve.
So use Tordon very judiciously...but I think you are going to need "something" there on that stump to kill it.