I had a "Italian Paste" tomato that I bought from a plant shop, and I grew it on in a container. It suddenly wilted and died, fusarium or verticillum wilt or something I suppose. I managed to ripen a couple of fruit (it is late summer here in New Zealand)and thought that I would save the seeds for next season. However I don't want to risk spreading the disease. Is there any way to treat the seed to prevent this?

Thanks

Brien