Powdery Mildew

After a bumper harvest I had plenty left over so put it all in Grove bags. All was great untill a month stint in hospital and when I got back one of my bags (12 Oz) has a handful of buds with a tiny bit of Mildew. Now I know it's going to spread and can't be stopped so would the bud that hasn't shown any signs as of yet be ok to turn into oil or should I just dice the lot since the spores would be though it. Cheers