Second Science Symposium
January 18 - 21, 2005

Infectivity and Survival of P. ramorum in Recirculation Water of Nurseries

Katrin Kaminski, Stefan Wagner, Sabine Werres, Federal Biological Research Centre for Agriculture and Forestry, Institute for Plant Protection in Horticulture, Messeweg 11/12, D-38104 Braunschweig, Germany; +49(0)2994407;; Heinrich Beltz, Chamber of Agriculture Weser-Ems, Department of Nursery Stock, Hogen Kamp 35, D-26160 Bad Zwischenahn, Germany; Dankwart Seipp, Chamber of Agriculture Weser-Ems, Department of Horticulture, Hogen Kamp 51, D-26160 Bad Zwischenahn, Germany; Thomas Brand, Chamber of Agriculture Weser-Ems, Plant Protection Service, Sedanstraße 4, D-26121 Oldenburg, Germany

In Europe the quarantine pathogen Phytophthora ramorum has been detected mainly on Rhododendron and Viburnum plants. The pathogen has been isolated from plants, soil and water including recirculation water in nurseries. So far little is known on the vitality and aggressiveness of the propagules in the water and whether the pathogen can survive in the recirculation system of nurseries.

A research project founded by the USDA forest service has started to focus on the pathogenicity and the survival of P. ramorum in irrigation water in a recirculation system over a period of two years. In a model system Rhododendron plants were cultivated on separated container stands and contaminated water is used for overhead irrigation. The disease development on the plants is observed regularly. Plants showing symptoms are investigated by direct isolation of P. ramorum and/or by PCR detection. For investigation of the survival of P. ramorum in the recirculation system, the occurrence and vitality of P. ramorum in the water reservoirs are tested with a bait test using Rhododendron leaves. Climate data and chemical data of the water are taken regularly.

The aims of the project and the test facility are described. Investigations are conducted over a period of two years and are still in process. Preliminary results of the first year are presented.


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Coordinated by:
USDA Forest Service Pacific Southwest Research Station
University of California Integrated Hardwood Range Management Program,
Center for Forestry, Division of Agriculture and Natural Resources, and
California Oak Mortality Task Force

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