Does anyone know if Biobarrier (or anything similar) is sold in Australia?

I have a problem with tree roots pushing against an asbestos fence causing it
to lean over. Given the size of the roots and the vigorous growth of the
tree, trimming the roots may only be a short term solution.

Biobarrier is a fabric that you bury in the ground and slowly releases
trifluralin which is some kind of herbicide/root inhibitor. The sales blurb
at www.biobarrier.com says that it works for up to 15 years.

Mike