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Most lily bulbs are sold in spring, although some, such as Lilium candidum, are sold in the autumn. This is a time when mould can thrive, so check them carefully when you buy to make sure there are no signs of it - an infected bulb can easily spread the fungus. Lily bulbs don't have a natural protective layer and are bruised easily, which can lead to rot.
Solution
Organic
In general, the bigger and plumper the bulb, the better. It needs to be firm and undamaged. If there's brown rot at the base of the bulb, don't buy it.
Chemical
Blue mould may appear on tissue that has been slightly damaged, but you can cut it away with a clean, sharp knife and dust the wound with fungicide.
