New data on Phytophthora ramorum
The EPPO Secretariat has extracted the following new data on Phytophthora ramorum (EPPO Alert List).
New findings in nurseries in USA
In California: P. ramorum was confirmed in a nursery (Monrovia nursery) in Los Angeles county, in March 2004. The presence of P. ramorum was unexpected because this nursery is not in the regulated area near any source of known infection, and the area is situated in a dry climate (previous detections of the organism have been confined to areas with a wet environment).
In Florida: Phytophthora ramorum (EPPO Alert List) was found in three nurseries. Plants had been imported from the nursery mentioned above in California.
In Georgia: P. ramorum was detected in five nurseries on Camellia plants which had also been imported from California. All infected plants will be destroyed (NAPPO Pest Alert).
New host plants
In May 2003, P. ramorum was isolated from leaflets of Rosa gymnocarpa, in California, US. Affected leaflets showed cream-to-brown lesions or spots, sometimes delimited by a chlorotic zone. The infected plants were found in a mixed forest where infected trees of Sequoia sempervirens, Umbellularia californica and Lithocarpus densiflorus were also present (Hüberli et al., 2004).
Hüberli, D.; Reuther, K.D.; Smith, A.; Swain, S.; Tse, J.G.; Garbelotto, M. (2004) First report of foliar infection of Rosa gymnocarpa by Phytophthora ramorum.
Plant Disease, 88(4), p 430.
NAPPO Pest Alert.
News Stories: Sudden Oak Death (Phytophthora ramorum) detected in five Georgia Nurseries & Sudden Oak Death (Phytophthora ramorum) discovered in three Florida nurseries (2004-04-14 & 2004-04-05)
Official Pest Reports - Sudden Oak Death Syndrome in California Nurseries (2004-03-17)