How to Manage Pests

Pests in Gardens and Landscapes

Botrytis leafspot (leaf blight)—Botrytis cinerea or other spp.

Botrytis leafspot, also called leaf blight, occurs on onions. White sunken spots on leaves are usually signs of infection; spots are small and tend to be oval. They sometimes have a light green halo and may appear water soaked. The epidermis around the spots may be silvery. When numerous spots are present, leaf tips die back and whole leaves may be killed.

Life cycle

Solutions

To reduce the level of disease inoculum in the soil, use a 3-year rotation scheme away from onions, garlic, and related crops and destroy volunteer onions during this period.

White sunken spots on leaves
White sunken spots on leaves

Silvery lesions
Silvery lesions


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