Root and aerial infections of Chamaecyparis lawsoniana by Phytophthora lateralis: a new threat for European countries |
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| Authors: | C Robin D Piou N Feau G Douzon N Schenck E M Hansen |
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| Institution: | 1. UMR 1202 BIOGECO, INRA 69 Route d’Arcachon, 33612 Cestas Cedex, France;2. E‐mail: robin@pierroton.inra.fr (for correspondence);3. Ministère de l’Agriculture, de l’Alimentation et de la Pêche, DGAL‐ SDQPV, Département de la Santé des Forêts, Paris Cedex, France;4. DRAAF Centre, SRAL, P?le interrégional de la Santé des Forêts, 93 rue de Curembourg, Aubrais Cedex, France;5. Laboratoire National de la Protection des Végétaux, Station de mycologie, IFR 110, Domaine de Pixérécourt, Malzéville, France;6. Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR, USA |
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| Abstract: | Phytophthora lateralis has been isolated from root and collar lesions in Port‐Orford Cedar (POC) trees (Chamaecyparis lawsoniana) in north‐western France (Brittany). These trees, planted in hedgerows, displayed symptoms similar to the typical symptoms of POC root disease. Until now, the disease has been found outside of the nurseries only in western North America. Aerial symptoms, not associated with root or collar infections, were also observed, and P. lateralis was isolated from branch lesions. Similar symptoms were previously observed only in one POC root disease site, located in the Pacific coast of Oregon where climatic conditions are similar to those occurring in Brittany. The reported aetiology as well as the morphological characteristics (deciduous sporangia) of P. lateralis suggests that this species could be air‐dispersed, as described for P. ramorum, a closely related species. This outbreak of P. lateralis in Brittany in farming landscapes associated with the aerial spread of this pathogen represents a new threat for European countries. |
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