I got my TPS on the mail, thanks Bill! So I decided that the who knows how many bags I planted with supermarket potatoes have to go. Got most of them out of the greenhouse because the spider mites are ravaging them so I figured its better that they melt in the rain. At least the rain will wash the mites for sure, its been raining like crazy. There is a lot of good manured soil in those bags that I dont want to throw away so I will harvest all the potatoes, keep seeds if I get any, replant the bags with sweet potato and then discard the soil. Afterwards its only TPS.
If you have mites, grow your TPS seedlings in pots as long as possible - eight weeks should get them to 6-8 inches tall. The bigger they are, they less vulnerable they will be to the mites. Small seedlings are often overwhelmed by mites.