What's the black-ish powder on my onions?

Question

I've noticed over the last few years that when I buy a sack of onions, some of them have spots of what almost looks like a moldy powder. Could this actually be mold on the onions? I haven't gotten sick and of course I do remove the onion skins. Just wondering if this is anything to be concerned about or if it's normal?

Answer 1

Black mold of onion is caused by the fungus Aspergillus niger. This disease can occur in the field or during storage. As the common name suggests, the primary symptom is a black discoloration of tissue. Infected bulbs may show blackening at the neck, streaks or spots of black on or beneath the outer scales, and black discoloration in bruised areas. In advanced stages, the entire bulb appears black and shriveled.
The fungus Aspergillus niger is common in the soil and on dead plant material. Infection of bulbs usually occurs through wounds (especially through the neck as onions mature and tops break over or are cut). The fungus may also enter through wounds on the roots or bruised outer scale tissue. Control of any foliar diseases will help reduce black mold during storage. It is also important to avoid wounding when bulbs are harvested, transported, or stored. Finally, proper drying and storage will help prevent the occurrence of black mold. Warmth and moisture favor disease development. For successful storage of onions, thorough ventilation, a low temperature , dry atmosphere, and protection against freezing are essential.

Answer 2

Onion Black Mold

Answer 3

The black powder is black mold spores. It should be okay to wash and peel the onions. It seems to happen often.

Answer 4

Its mold!!! the onion on the inside should be fine. just peel of a few layers!!!