How to Manage Pests

Pests in Gardens and Landscapes

Phytophthora root rot—Phytophthora spp.

Aboveground symptoms of Phytophthora root rot are typical of plants with a weak root system; infected plants are slow growing and may wilt or die in hot weather. Roots may have water-soaked injured areas that gradually dry and turn chocolate brown as the disease progresses.

Life cycle


Avoid prolonged saturation of the soil or standing water. Provide good soil drainage. Raised beds provide good drainage in gardens.

For more information, see the Phytophthora Root and Crown Rot Pest Note.

Above-ground symptoms
Above-ground symptoms

Browning of inner root tissue
Browning of inner root tissue

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