How to Manage Pests

Pests in Gardens and Landscapes

Seasonal development and life cycle—Pink root

Pink root is primarily a problem on onion; garlic is also infected by the fungus but is not affected at an economically important level. The fungus is a common soil inhabitant that penetrates roots directly; wounds are not necessary for infection, but weak plants are more susceptible. The pathogen can persist in soil indefinitely; the longer plants are grown in the garden, the more destructive the disease becomes. The fungus can be spread in water or on dirty equipment. Optimum temperatures for disease development are 75° to 85° F.

Discoloration of onion roots
Discoloration of onion roots


Statewide IPM Program, Agriculture and Natural Resources, University of California
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