I battled it for years until I found this cure.

when the shoots come in the spring, let them get 8-12" high.
Then get a long metal drill. Break off the shoot and then drill down
the center unti you hit some resistance. Then drill about 1/2"
further. Now pour a teaspoon of Roundup in there - Wham!!!
That will kill the shoot and the root underneath. This works!!!
Joe