Here’s the cure: http://www.eweedcontrol.com/images/BIG-Weed-Dragon-Back-Pack.jpg
I’ve got one of these badboys and they do the job. The main trick in most noxious weed control is to get the whole plant. Failing that, trash the sucker when it is getting ready to flower (consuming all the plant’s energy reserves). Most of the time, it’ll give up the ghost if you get it at that point in its life cycle.
Can it be modified for mob crowd control?