you are not cynical? On Mt Majura we have 2 sites where we observe E oblongata; they are behind gardens where the species grows. I'm not sure how it spreads but at least in one case I assume garden waste dumping. I keep a close eye on regrowth and remove whenever I spot some, either by pulling or cut and spray; this treatment is only possible as long as there are small amounts that we don't allow to spread further. An ongoing issue... Waltraud, Friends of Mt Majura