How to Manage Pests
UC Pest Management Guidelines
Bacterial soft rots are characterized by softening and water soaking of one or more of the inner fleshy scales of the bulb. Affected tissue is yellow initially, turning brown as the disease progresses lengthwise in the bulb. The neck of infected bulbs may be soft when pressed. These organisms generally appear just before or at the time of harvest or in storage.
Bacterial soft rots are primarily a problem on onions, but not garlic. Free water is essential for entry and spread of the bacteria. Wounds and senescent leaves are the means by which bacteria gain entrance into the bulb. The pathogens are soilborne and may be spread in irrigation water.
UC IPM Pest Management Guidelines: Onion and Garlic