How to Manage Pests

Pests in Gardens and Landscapes

Seasonal development and life cycle—Verticillium wilt

The fungus that causes Verticillium forms resistant structures that can survive for years in the soil in the absence of a living host. In the presence of a host plant, the resistant structures germinate and penetrate the plant's roots either directly or through wounds. Once inside the root, the fungus grows until it reaches the water-conducting cells, inside which it spreads upward through the plant, restricting water flow. Infection is favored by cool weather, but injury is most severe during periods of hot weather when plants are stressed for water.

Discoloration of vascular tissue
Discoloration of vascular tissue

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