[Rotorvator]

hi I have seen the coments on the latest email letter and We use Tescos own and have a good crop every year we always find seed potatoes do not grow well here at all

[New shoot]

If it is working for you then that is good, but as John says in his article…

https://www.allotment-garden.org/vegetable/potatoes/can-you-chit-supermarket-potatoes/

…it is usually OK, but you do have to be aware that they are not subject to the same standards as seed potatoes as regards potato diseases.  The trouble is that if you import one of those diseases into your soil via a supermarket potato, the consequences can last for years and affect any future crops you plant.  It is a fairly low risk of that happening, but it is a risk.

[Yorkie]

If growing on a communal allotment site, the risk is also to all of your neighbours and not just to your crops.

I'd never take the risk. It's impossible to tell a virus-ridden and virus-free spud apart until the damage has been done.

[snowdrops]

For the actual cost of seed potatoes & how many I buy I stick to certified disease free seed potatoes, I don’t want to risk contamination of my soil or my plot neighbours as Yorkie says. Really annoys me when I see potato crops ravaged by blight on the allotments & just left & left to spread it around further.