How to Manage Pests

Pests in Gardens and Landscapes

Clubroot—Plasmodiophora brassicae

Clubroot is a problem on plants such as cabbage, broccoli, alyssum, and nasturtium. During initial stages of clubroot, aboveground symptoms may be absent. Foliar symptoms include stunting, yellowing, and wilting. Extensive galling, swelling, and distortion of the roots and hypocotyl are the main symptoms of the disease. Clubroot is common in soils where Brassica spp. plants have previously grown.

ldentification | Life cycle


Clubroot is most common in acid soils. Add lime annually to affected soils below pH 7.2. Provide good drainage.  Minimize the spread of the pathogen by using pathogen-free transplants. Avoid planting plants where other infested plants in the mustard family have grown, such as broccoli and cabbage. Solarization will also give control.

Undeveloped root system and clubbing Undeveloped root system and clubbing

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