Reducing Onion Storage Rots
Onions should be mature and dry when harvested. Onion bulbs need to be carefully handled to minimize bruising and cuts that can allow disease to enter. Onions need a period of curing or drying in order to seal the neck, prevent invasion of diseases and rot and to create a bright, crack-free skin. In temperate regions, curing is usually carried out in storage, but elsewhere, onions are lifted and left to dry in the field.