First Report of Phytophthora ramorum on Rhododendron sp. in Spain

Plant Disease
E Moralejo, Sabine Werres

Abstract

Phytophthora ramorum has been recently described (4) from isolates collected since approximately 1993, from Rhododendron and Viburnum in the Netherlands and Germany. Since 2001 and 2002, respectively, there have been unconfirmed reports from Poland and Great Britain (1). There are growing concerns about this oomycete since it has been recognized as the causal agent of sudden oak death in California, where thousands of oaks and tanoaks (Quercus agrifolia, Q. kelloggii, Q. parvula var. shrevei, and Lithocarpus densiflorus) have died. Since the first outbreak in Marin County, California in 1995, (3) the epidemic has remained concentrated mainly along the Pacific Coast near San Francisco but has been reported in Oregon (2). There have been no reports of oaks or other trees affected in Europe. During February 2002, E. Moralejo surveyed several nurseries in Mallorca, (Balearic Islands, Spain) to verify the presence of P. ramorum on rhododendron. Two shipments of rhododendrons, from the towns of Palma and Santa Maria del Camí, showed twig blight and necrotic spots at leaf tips and margins. Less than 0.5% of the aerial parts of the potted plants of both sets were affected. Isolations from symptomatic tissue consistently yielded culture...Continue Reading

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