How to Manage Pests

Pests in Gardens and Landscapes

Avocado root rot—Phytophthora cinnamomi

Avocado root rot causes leaves to be smaller than normal. They are usually pale or yellow green. New growth is absent or stunted. Feeder roots are blackened and dead.

Solutions

Avocado root rot is associated with excess soil moisture due to overirrigation or poor drainage. Good water management is essential to reduce the threat of rot. It prolongs the life of diseased trees and can prevent spread to other trees. Avoid prolonged saturation of the soil. Plant on mounds and provide good soil drainage. Some rootstocks may provide resistance.

Avocado tree dying from P. cinnamomi
Avocado tree dying from P. cinnamomi


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

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