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How to Manage Pests

Pests in Gardens and Landscapes

Seasonal development and life cycle—Walnut blight

The bacteria that causes walnut blight survives on and in dormant buds and catkins and also in twig lesions. Rain or prolonged sprinkling is important for spreading bacteria and aiding infection. Early leafing varieties are most severely affected, and the disease tends to be more severe in Northern California.

Walnut blight lesion on shoot
Walnut blight lesion on shoot

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