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Australian Journal of Botany Australian Journal of Botany Society
Southern hemisphere botanical ecosystems
RESEARCH ARTICLE

Time since fire and average fire interval are the best predictors of Phytophthora cinnamomi activity in heathlands of south-western Australia

Nicole Moore A B , Sarah Barrett A , Kay Howard B , Michael D. Craig B C D , Barbara Bowen B , Bryan Shearer A B and Giles Hardy B
+ Author Affiliations
- Author Affiliations

A Department of Parks and Wildlife Albany District, 120 Albany Highway, Albany, WA 6330, Australia.

B Centre for Phytophthora Science and Management, School of Veterinary and Life Sciences, Murdoch University, Murdoch, WA 6150, Australia.

C School of Plant Biology, University of Western Australia, Crawley, WA 6009, Australia.

D Corresponding author. Email: m.craig@murdoch.edu.au

Australian Journal of Botany 62(7) 587-593 https://doi.org/10.1071/BT14188
Submitted: 11 August 2014  Accepted: 21 November 2014   Published: 19 February 2015

Abstract

Fires are features of ecological communities in much of Australia; however, very little is still known about the potential impact of fire on plant diseases in the natural environment. Phytophthora cinnamomi is an introduced soil-borne plant pathogen with a wide host range, affecting a large proportion of native plant species in Australia and other regions of the world, but its interaction with fire is poorly understood. An investigation of the effects of fire on P. cinnamomi activity was undertaken in the Stirling Range National Park of south-western Australia, where fire is used as a management tool to reduce the negative impact of wildfires and more than 60% of the park is infested with, and 48% of woody plant species are known to be susceptible to, P. cinnamomi. At eight sites confirmed to be infested with P. cinnamomi, the proportion of dead and dying susceptible species was used as a proxy for P. cinnamomi activity. Subset modelling was used to determine the interactive effects of latest fire interval, average fire interval, soil water-holding capacity and pH on P. cinnamomi activity. It was found that the latest and average fire interval were the variables that best explained the variation in the percentage of dead and dying susceptible species among sites, indicating that fire in P. cinnamomi-infested communities has the potential to increase both the severity and extent of disease in native plant communities.

Additional keywords: Phytophthora dieback, Stirling Range National Park, susceptible.


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