Thanks everyone, I think we have gladiator termites.
As we have tried the washing powder mix and it didn't work. But maybe I should try the cheapest washing powder possible. But anyway thanks for clearing up the tobacco dust thing. I knew I have read something in the past on this subject and I remembered that there was some bad connectation but I couldn't remembered the detail so when this lady told me about this I was sceptical and you just confirmed it.
I am in the process of "adding" another inhabitant to the Vermeulen Zoo I guess we can still accomodate 2 pekin chickens. I know they will eat all the buggers that surface but I will try the washing powder mix again. It brakes my heart as I have collected my ferns with great difficulty and what do they eat the ones that are the most difficult to find. I can not plant any ferns in the ground and I hate the look of them in pots but that's all I can do. And to make matters wors I have to put them on bricks so that the termites can't build nests under the pots.