The Washington State Department of Agriculture (WSDA) has surveyed 30 host and non-host nurseries to date this year for P. ramorum, all of which have been negative for the pathogen. Some shippers in the state have greatly reduced the amount of high-risk genera (Camellia, Rhododendron, Pieris, Viburnum, and Kalmia) inventory for sale in an effort to reduce the risk of a P. ramorum find. However, two nurseries continue to yield positive water samples - one in Pierce County and one in King County. These sites continue to be monitored as no infected plants have been found in association with the positive water and the inoculum source is unknown. February and April surveys of plants downstream from the Pierce County positive nursery perimeter salal find in 2009 found no positive plants, and the Rosedale Stream has been continuously baited since January 2010, with no positive water finds. WSDA also followed up on trace-forward investigations from a Pennsylvania positive nursery, of which all 160 Laurus nobilis imported plants were free of P. ramorum.
From the May COMTF newsletter
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