EPPO Global Database

EPPO Reporting Service no. 05 - 2003 Num. article: 2003/079

Phytophthora ramorum found on Rhododendron in Washington State (US)

On 2003-06-05, the presence of Phytophthora ramorum (EPPO Alert List) was officially confirmed in Washington State, US. P. ramorum was found in 4 Rhododendron (out of 261 tested) at a nursery in south King’s County, Washington State. This detection was made as a result of tracing studies of plants sent by another nursery in Oregon where the disease had been found. In addition to this nursery, 12 nurseries were also surveyed with negative results. During a US nation-wide survey, more than 1,000 samples had been collected with only one positive find in Oregon. Phytosanitary measures are being taken to continue to delimit the extent of the disease in nurseries and prevent any further spread.


NAPPO Pest Alert – Official notifications.
Sudden Oak Death (SOD), Phytophthora ramorum, first detection in Washington State – 06/12/2003. http://www.pestalert.org