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Abstract
The genus
Phytophthora comprises over 70 described species, however many new species have been reported recently as a result of the discovery of previously undetected species or by the hybridization of known species.
Phytophthora ramorum, one of the new
Phytophthora species, is considered a high phytosanitary risk because it is currently responsible for large-scale oak mortality in coastal California forests. In Europe, the disease occurs mainly in nurseries on
Rhododendron,
Viburnum and
Camellia. However, in landscapes, infected trees of
Quercus rubra,
Q falcata,
Q. ilex,
Aesculus hippocastanum and
Fagus sylvatica were reported recently on sites previously identified with infected
Rhododendron plants. In addition, numerous nurseries in the U. S. have recently been diagnosed with infected
Rhododendron and
Camellia spp.
Parent Publication
Citation
Bonants, Peter; Verstappen, Els; De Vries, Ineke; Wiejacha, Katarzyna; Ivors, Kelly. 2006. Molecular identification and detection of
Phytophthora ramorum. In: Frankel, Susan J.; Shea, Patrick J.; and Haverty, Michael I., tech. coords. Proceedings of the sudden oak death second science symposium: the state of our knowledge. Gen. Tech. Rep. PSW-GTR-196. Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture: 135-138
