Blue Mould on Bulbs

This daffodil bulb is infected with Blue Mould, caused by a penicillin mould (fungus). A dark rot, usually at the base of the bulb (it can also be on the side), causes softening of the tissue.

The mould usually enters the bulb from the soil (often from a wound), but symptoms only develop during storage at too high a temperature in damp conditions. Infected bulbs rot in the soil after planting, and infect the surrounding soil with the disease.

So always plant only firm healthy bulbs and discard any which are suspect. If you damage any bulbs, dust each wound with sulphur powder.