01972nas a2200157 4500008004100000245014000041210006900181300001200250490001400262520134300276100001601619700001501635700001401650700001401664856013601678 2011 eng d00aPhytophthora leaf blight - a new disease of California wax-myrtle (Morella californica) in Oregon, USA caused by a Phytophthora species0 aPhytophthora leaf blight a new disease of California waxmyrtle M aS57-S630 v41 Suppl.3 a

In spring, 2009, the Oregon State University Plant Clinic received reports of severe defoliation of California wax-myrtle plants (Morella californica (Cham. & Schlecht.) Wilbur) on the north-central coast of Oregon, in western North America. Isolations from necrotic leaf tissue yielded an organism which, from morphological characteristics and a genus-specific enzyme-linked immunosorbent assay, was identified as a species of the genus Phytophthora. Total DNA was extracted from hyphal tip-derived cultures from leaf or twig tissue and subjected to a polymerase chain reaction process aimed at species identification. Sequencing techniques revealed a 99.7% match with P. syringae although our isolates differed from published descriptions of this species in some respects. Inoculation of healthy plants with cultured mycelium resulted in symptoms similar to those originally observed in the field, and reisolations produced colonies of the same organism. This is the first report of a species of Phytophthora causing disease in M. californica. Leaf blight of California wax-myrtle is now widespread on the north-central coast of Oregon. This disease is serious and is adversely affecting the health of this native understory species which is frequently used for amenity plantings.

1 aPutnam, M L1 aSerdani, M1 aCurtis, M1 aAngima, S uhttps://forestphytophthora.org/references/phytophthora-leaf-blight-new-disease-california-wax-myrtle-morella-californica-oregon-usa