How to Manage Pests

Pests in Gardens and Landscapes

Seasonal development and life cycle—Late blight

Late blight occurs commonly in coastal environments and sporadically elsewhere. The fungus inoculum can originate from seed tubers, cull piles, volunteers, closely related weed hosts such as nightshade, and adjacent plantings of potatoes or tomatoes that are affected. Late blight can develop and spread rapidly if inoculum is present and conditions are conducive. High humidity and average temperatures in the range of 50° to 78° F favor the disease. Air circulation to facilitate the drying of foliage each day is important. Overhead sprinklers can favor late blight.

Lesions may support fungus sporulation
Lesions may support fungus sporulation


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