Pacific Northwest 1998 An Online Guide to Plant Disease Control

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OSU Extension Office
 
Viburnum -- Ramorum Leaf Blight and Shoot Dieback
See Also: Tanoak -- Sudden Oak Death ; and Rhododendron -- Ramorum Leaf Blight and Shoot Dieback
 
Symptoms: The disease is characterized by leaf blights and shoot diebacks. Infected leaves may die and fall off, leaving dark leafless stems. In more severe infections, plants can be killed.

Nursery grown Viburnum plicatum tomentosum ‘Mariesii’ plants with necrotic leaf spot.

Dead Viburnum plicatum tomentosum ‘Mariesii’ plant, but also note the necrotic leaf spots on leaf tips in background.

Nursery grown Viburnum plicatum tomentosum 'Summer Snowflake'plant with dark, necrotic shoots and leaf blight.

 
Notes: The following cultivars have resistance to this disease; V. dentatum cvs. Autumn Jazz, Blue Muffin, and Chicago Lustre and V. plicatum cv. Shoshoni.
References:
Grünwald, N. J., Kitner, M., McDonald, V., and Goss, E. M. 2008. Susceptibility in Viburnum to Phytophthora ramorum. Plant Dis. 92:210-214.
Content edited by: Jay W. Pscheidt and Jennifer Parke on January 1, 2009
 
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