Dogwood

Disease

Anthracnose

Armillaria root rot

Collar rot

Leaf scorch and leaf roll

Insect

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Caption: Dogwood Phytophthora collar rot

Photo by: R.S. Byther

Dogwood : Collar rot

(revision date: 4/28/2014)

Use Integrated Pest Management (IPM) for successful plant problem management.

Biology

Collar rot is caused by a soilborne fungus which usually infects the plant through wounds on the trunk. It can also infect roots. A canker develops on the trunk near the soil surface or on the roots just below ground. This later becomes sunken and the bark falls off. The tree dies if the trunk is girdled. The first symptom of infection is general poor health, followed by death of twigs and branches. The same fungus causes root or collar rots in several different plant species.

Management Options

Non-Chemical Management

Prevent wounds on the tree trunk where the fungus can enter.
Remove and destroy infected trees, including large roots.
Do not replant in infected soils.

Select non-chemical management options as your first choice!

Chemical Management

IMPORTANT: Visit Home and Garden Fact Sheets for more information on using pesticides

None recommended

Images

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Caption: Dogwood Phytophthora collar rot Photo by: R.S. Byther

WSU Extension

Hortsense