Charleen you be REALLY careful with those, 3 can kill a horse. my neighbor says one can, but the extension service says 3. anyway, be sure any hay, alfalfa, or the like cannot contain these evil things.
I don't want anything to happen to your mules.
Sevin seems to work, I just have so damn many hostas it is hard to be sure you have covered them all. the ground is black with dead blister bugs. yes siree...