Hackberry dieback—unexplained disorder
Hackberry dieback occurs on Chinese hackberry (Celtis sinensis) at least around Davis, California.
Identification
Symptoms resemble those of a vascular wilt disease, such as that caused by Verticillium fungus. Foliage turns yellow then brown and is undersized, sparse, or both. Limbs die back. When affected wood is cut, it is found to be darkly stained.
Life cycle
Hackberry dieback is caused by an unexplained disorder. Its biology and life cycle are unknown.
Damage
Foliage becomes brown, yellow, and sparse and is undersized. Limbs may die back. Vascular tissue may be darkly stained. The affected tree may die prematurely.
Solutions
Provide appropriate cultural care and a good growing environment, especially adequate soil drainage. Avoid excess irrigation. Where the problem occurs, potentially minimize this development of this disorder by cleaning and sterilizing tools (e.g., with bleach) after working on each tree, before moving to work on another.
Adapted from Pests of Landscape Trees and Shrubs: An Integrated Pest Management Guide, University of California Statewide Integrated Pest Management Program (UC IPM).
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Foliage yellowing precedes hackberry limb dieback due to an unexplained malady.
Chlorotic, unhealthy hackberry foliage.
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