I have never had any problem getting rid of them. We cut them down to
the ground and then mowed the area whenever we mowed the lawn and they
never put up a good effort to come back. We now have to be careful not
kill off the remaining berrys that we do have. I do think if you take
roundup and with a paint brush paint the roots that it will kill them.
Make sure though when you paint the roots that they still are above the
soil at least three inches.
Chuckie