What eats onion sets?
Last autumn I planted about 150 red and white onions that I'd started off in modules indoors at my allotment. After a few weeks I realised the birds were amusing themselves by pulling them up, so we fleeced them for winter. When we took the fleece off there were only about 10 onions left, looking decidedly munched rather than nibbled, am I right in concluding that they've probably been had by rodents? I don't think it's anything slimier because of the time of year. Shallots and garlic planted in the same bed are doing perfectly fine.