How to Manage Pests

Pests in Gardens and Landscapes

Pseudonectria canker—Pseudonectria rousseliana (conidial state Volutella buxi)

Pseudonectria canker causes branches to die back and leaves to become tan in color. Leaves turn upward. Small fungus fruiting bodies may appear on the lower surface of affected leaves and branches.


Provide plants with proper cultural care to keep them vigorous and to limit these diseases. Prune out dead leaves and dead and dying branches when they are first observed. Spraying in the spring with fungicides such as Bordeaux and fixed copper may help control the spread of the disease.

Tan leaves and twigs
Tan leaves and twigs; leaves turn upward along stem

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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