How to Manage Pests

Pests in Gardens and Landscapes

Ash dieback—Botryosphaeria stevensii or Diplodia mutila

Ash dieback is a fungal disease primarily affecting Raywood ash. Leaves fade, turning yellow or brown, eventually wilting. Symptoms are often scattered throughout the canopy. Branches die. The entire plant may die.


There is no known specific remedy for controlling ash dieback. Provide a good growing environment and appropriate cultural care.

Ash leaves dying from Ash dieback
Raywood ash leaves dying from ash dieback

Limb cankers on Raywood ash
Limb cankers on Raywood ash

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