How to Manage Pests

Pests in Gardens and Landscapes

Oak twig blight—Cryptocline cinerescens and Discula quercina

Oak twig blight affects primarily coast live oak, but also may occur on other oak species. Leaves and twigs from the current season's growth turn white or tan and remain on the tree, often in scattered patches throughout the tree canopy.

Solutions

Provide trees with adequate cultural control, especially appropriate watering. Do not irrigate native oaks during the dry season; irrigate during the winter if needed because rainfall has been below normal. Prune out all infected twigs during dry weather in the summer and fall; make pruning cuts properly in tissue below infected twigs. The disease is most severe when pit scales are present.

Scattered patches of dead leaves
Scattered patches of dead leaves on oak

Tanning of leaves on branch
Tanning of leaves on branch


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