These are small at first but later cover the entire scale. The fungus moves into bulbs which are be blackened on the surface and shrunken and hard on the inside. Destroy diseased bulbs. No chemical control is listed. Use benomyl to control this disease.
Blue mold is a storage disease controlled with benomyl.
Mosaic causes the bud sheath to be marked by bluish bulbs. No chemical control is listed. This information is for educational purposes only. References to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. This information becomes public property upon publication and may be printed verbatim with credit to MSU Extension.