Hi Marilyn, I just got the Bonide Thuricide yesterday, had to order it online, but misted them just before dark last night, so we will see. There isn't really anything hanging over the pond, but there are plants all around it. After thinking on this for a while, I think it's the same worm that started eating my rose bushes a while ago.
My neighbor had gotten some Canna, and they are being eaten by a black fuzzy caterpillar as well. (at my size, they are smooth) Mine are much smaller than hers though, and seem to be mostly in the pond. We've just never, ever had any kind of caterpillar here before, so it's confusing us as to where they are just magically showing up from. But I have seen a couple just laying on the floor of the patio though, mostly dead. They have become pitch black in color too.
I am not sure the Thuricide will work though, if they are not IN the pond, but coming to it....we'll see. Winter is almost upon us here though, so it might not be an issue much longer.