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Containment and eradication of Phytophthora cinnamomi in native vegetation in South-Western Australia and Tasmania

Dunstan, W.A., Rudman, T., Shearer, B.L., Moore, N.A., Dell, B., Crane, C., Barrett, S. and Hardy, G.E.St.J. (2009) Containment and eradication of Phytophthora cinnamomi in native vegetation in South-Western Australia and Tasmania. In: Phytophthoras in Forests and Natural Ecosystems Fourth Meeting of the International Union of Forest Research Organizations (IUFRO) Working Party S07.02.09, August 26–31, 2007, Monterey, California pp. 218-226.

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The aim of our experiments was to develop protocols that can be used to contain and eradicate spot infestations of P. cinnamomi that, if untreated, are likely to threaten extensive areas of native vegetation or areas of high conservation value. Treatment regimes were guided by two assumptions: 1) within the selected sites, transmission of the pathogen is by root-to-root contact, and 2) the pathogen is a weakly competitive saprotroph. In Western Australia (WA), treatment and control plots were set-up along an active disease front within scrub-heath vegetation dominated by Banksia spp. Treatments, applied sequentially and in combination, included: 1) destruction of the largest plants within disease free vegetation forward of the disease front; 2) destruction of all plants to create a ‘dead zone’; 3) installation of physical root barriers and subsurface irrigation for the application of fungicide/s; 4) surface applications of fungicides selective against oomycetes (triadiazole and metalaxyl-M), and 5) surface injection and deep (± 1 m) treatments with Metham-sodium. In a separate experiment in Tasmania (TAS), combined treatments including vegetation removal, Ridomil and Metham-sodium and root barriers, or Ridomil and root barriers alone, were applied to experimental plots within active disease centres in Eucalyptus-Banksia woodland.

In the WA experiment, P. cinnamomi was not recovered (by soil baiting) from plots after treatment with Ridomil and metham-sodium. In the TAS experiment, similar results were achieved with combined treatments (vegetation removal + Ridomil + metham sodium) but in plots treated with Ridomil alone, recoveries of P. cinnamomi increased after initially showing a significant reduction in recoveries.

Item Type: Conference Paper
Murdoch Affiliation(s): Centre for Phytophthora Science and Management
Publisher: U.S. Department of Agriculture, Forest Service
Notes: Proceedings of the Fourth Meeting International IUFRO Working Party S07.02.09: Phytophthoras in Forests and Natural Ecosystems, 26-21 August 2007, Monterey, California, U.S. Tech. coords. E.M. Goheen & S.J. Frankel. Gen. Tech. Rep. PSW-GTR-221. US Department of Agriculture, Forest Service Southwest Research Station, Albany, California.
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