In the PNW, you can rent goats for blackberry control, along with sections of
portable chainlink fence.
http://www.youtube.com/watch?v=w9jxa7T6WGQ
How about power pruners like:
http://www.blackanddecker.com/outdoor/LP1000.aspx
or the pro versions?
Do you know about Technu IvyBlock and Technu Extreme?
http://www.ivyblock.com/
http://www.teclabsinc.com/store/pois.../tecnu-extreme A friend who is
exquisitely sensitive to poison oak/ivy/sumac swears by it.
Kay