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I agree with sqeezyjohn the only think I have heard that works is when you harvest a crop remove all the leaves and dig them into where you are going to plant your onions the following year. This is why some growers grow their onions in the same bed every year. Apparently this practice eventually kills of the white rot spores because they do not get a chance to rest or something like that.I have not tried it but a lad on our plot swears by it. Might be worth a try.....Best of luck!
I wonder if that's the same kind of approach that putting your chimney soot on an onion bed comes from - not only is soot packed with all kinds of nutrients and minerals, but the creosote content which is present in soot presumably has some anti-microbial and anti-fungal action.I'm normally a committed no-digger - it's worked wonders on some of my plants ... but I am coming to the conclusion after 8 years or so that onions suffer from a lot more ailments in a no-dig regime and that a proper old fashioned digging over will probably help an onion crop.
Onion rot has become endemic on our site over the last few years which makes growing onions a bit of a challenge.Does anyone know varieties of onions (available as sets) that are more resistant to it than others?