Posted: 24/06/2015 at 16:08
Yes I read that the fungus or whatever it is can lie in the soil for 20 years or more and as soon as onions are planted chemicals are released into the soil and the fungus comes to life, the fungus can be transported from one place to another on tools, boots or even in water to infect another place. Apparently it doesn't do well in places where onions can be grown in dry constant temperatures above 20c so that rules out the UK. Of course the conditions which I grew my overwintering onions in didn't help the soil being on the heavy side so I guess the onion rot was bound to strike. I have grown some leeks to be transplanted into the allotment when space becomes available so I will still give them a go but from now on I think that I will be giving anything from the allium family a miss.