Australasian Plant Pathology (2010) 39, 477-491

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Alexander J. Rea, Thomas Jung, Treena I. Burgess, Michael J.C. Stukely and Giles E. St J. Hardy (2010)
Phytophthora elongata sp. nov., a novel pathogen from the Eucalyptus marginata forest of Western Australia
Australasian Plant Pathology 39 (6), 477-491
Abstract: A novel homothallic species of Phytophthora producing semipapillate sporangia on sympodially branching sporangiophores, thick-walled oospores in smooth-walled oogonia, and paragynous antheridia is described here as Phytophthora elongata sp. nov. DNA sequencing of the internal transcribed spacer (ITS) DNA and coxI gene confirm P. elongata as a distinct species within ITS clade 2. It has been isolated in the northern jarrah forest of Western Australia (WA) from the roots and collars of dead and dying Eucalyptus marginata and occasionally Corymbia calophylla in rehabilitated bauxite mine pits. It has also been associated with dead and dying plants of several mid- and understorey species in the northern and southern jarrah forest - Banksia grandis, Leucopogon propinquus, Dryandra squarrosa and an Andersonia sp., as well as the monocotyledonous Xanthorrhoea preissii, X. gracilis and Patersonia xanthina. P. elongata has also been isolated from sandy soils and loams in Victoria in eastern Australia. The pathogenicity of P. elongata to E. marginata and Banksia spp. has been shown in this and earlier studies. Due to the uniformity of the ITS DNA and cox1 sequence data in WA, P. elongata may be the result of a recent clonal introduction. More pathogenicity tests on a wider range of native plant species are needed to assess the host range of P. elongata and its invasive potential in WA.
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Link to article at publishers website
Database assignments for author(s): Treena Burgess, Thomas Jung

Research topic(s) for pests/diseases/weeds:
identification/taxonomy


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Phytophthora elongata Australia (South+SE)
Phytophthora elongata Eucalypt (Eucalyptus) Australia (Western)
Phytophthora elongata Xanthorrhoea (genus) Australia (Western)
Phytophthora elongata Banksia (crop) Australia (Western)