Thanks Rick. I'm still mulling over what to do; I realise I'm not going to be able to keep viruses out entirely, so I'm inclined towards focussing on the plants that tolerant (asymptomatic) or resistant. There are a couple of Asiatic hybrids that were in close proximity to 'Pink Giant' and yet look clean and are doing their usual thing.
At the moment I'm planning to make a bunch of crosses between these seedlings just in case I have to ditch them all.
