Phytophthora ramorum infection of coast live oak leaves in Californian forests and its capacity to sporulate in vitro

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Contents Vol 37(1)

doi:10.1071/AP07085

Phytophthora ramorum infection of coast live oak leaves in Californian forests and its capacity to sporulate in vitro

A. M. Vettraino ^A ^B ^D, D. Hüberli ^A ^C, M. Garbelotto ^A

^A Department of ESPM-ES, 137 Mulford Hall, University of California, Berkeley, CA 94720, USA.
^B Current address: Department of Plant Pathology, University of Tuscia, Viterbo, Italy.
^C Current address: Centre for Phytophthora Science and Management, School of Biological Sciences and Biotechnology, Murdoch University, Murdoch, WA 6150, Australia.
^D Corresponding author: Email: vettrain@unitus.it





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Australasian Plant Pathology 37(1) 72–73 http://dx.doi.org/10.1071/AP07085
Submitted: 27 September 2007 Accepted: 29 October 2007 Published online: 3 January 2008

Abstract

Coast live oak (Quercus agrifolia) is a known host for Phytophthora ramorum, the casual agent of sudden oak death in California, with symptoms expressed as necrotic stem cankers. In the forest, leaves on two saplings in California were found to be infected with P. ramorum and these were associated with infected bay laurel (Umbellularia californica) trees. Coast live oak leaves supported sporulation and produced chlamydospores in vitro. This is the first report to identify foliage of coast live oak as a source of infection of P. ramorum in the forest and its confirmation in in vitro inoculations.