If you can, lift the tubers and have a poke about in the 'shells' to see if there are any more grubs lurking. If there is more than half the tuber left and it is firm then they may grow for you. If not then I would buy fresh tubers and start again.

As for watering as soon as you see growth I'd give them the provado drench.

thanks sbg, that has helped my course of action.
ps my fish have had a good feed from scavenging out as many grubs as poss, but can guarantee not to of got them all?
cheers kev

Just make sure that the tubers themselves are clean and replant them in fresh compost. Spread the old compost out on a tray in the garden to let the birds have a go at it, then dump it in the rubbish bin.

Doesn't Provado need a minimum temperature to be effective? Can't remember what it is though. I'd bin them if there aren't too many, just to be on the safe side.

thanks bulba , seems like your confirming the way I was thinking, they will be in quarantine regardless , mmm you may have a point there stera, something at the back of my mind says your right, will have to check that one out, hopefully I can save them, but then again their otherwise reliable showing may already be compromised.
thanks again for info
kev

It is the nematodes which need a minimum temperature, not the chemical drench.

Thanks OB - makes sense.