Threat Abatement Plan for Dieback caused by the root-rot fungus Phytophthora cinnamomi
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The Threat abatement plan for disease in natural ecosystems caused by Phytophthora cinnamomi is licensed by the Commonwealth of Australia for use under a Creative Commons By Attribution 3.0 Australia licence with the exception of the Coat of Arms of the Commonwealth of Australia, the logo of the agency responsible for publishing the report, content supplied by third parties, and any images depicting people. For licence conditions see: http://creativecommons.org/licenses/by/3.0/au/.
This report should be attributed as ‘Threat abatement plan for disease in natural ecosystems caused by Phytophthora cinnamomi, Commonwealth of Australia 2014’.
The views and opinions expressed in this publication are those of the authors and do not necessarily reflect those of the Australian Government or the Minister for the Environment.
The contents of this document have been compiled using a range of source materials and are valid as at August 2013.
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Stirling Ranges wildflowers (Rob Olver), Mondrup Peak (copyright Department of Parks and Wildlife, Western Australia)
This national threat abatement plan (TAP) has been developed to address the key threatening process ‘Dieback caused by the root-rot fungus[1] Phytophthora cinnamomi, which is listed under the Commonwealth Environment Protection and Biodiversity Conservation Act 1999 (the EPBC Act). The TAP establishes a national framework to guide and coordinate Australia’s response to P. cinnamomi. It sets out the actions necessary to abate impacts of the listed key threatening process and was developed to comply with the requirements under the EPBC Act for the development of threat abatement plans. It identifies the research, management and other actions needed in Australia’s response to this pathogen and replaces the threat abatement plan published in 2001 (Environment Australia, 2001).
The plan has been developed with the involvement and cooperation of a broad range of stakeholders, but the making or adoption of this plan does not necessarily indicate the commitment of individual stakeholders to undertaking any specific actions. Proposed actions may be subject to modification over the life of the plan due to developments in understanding of the organism and its impacts.
The Australian Government Department of the Environment (Department of the Environment) is responsible for preparing this TAP. Its development has been informed by:
the current threat abatement plan (published in 2001)
a review and evaluation of the 2001 TAP undertaken by the Australian Government (CPSM, 2006)
information provided by key stakeholders between 2010 and 2013.
This plan should be read in conjunction with the document ‘Background: Threat abatement plan for disease in natural ecosystems caused by Phytophthora cinnamomi’ (the background document) (Department of the Environment, 2014). The background document provides information on the scope of the problem; the characteristics, biology and distribution of the pathogen; impacts on the environment and management practices (as at 2013).
The goal of this TAP is to identify and protect environmental assets (threatened species and ecological communities listed under the EPBC Act and other matters of national environmental significance) from the impacts of P. cinnamomi. It integrates: strategies to prevent P. cinnamomi spreading into areas that are free of disease; strategies to reduce the impacts in infested areas; and recovery actions for the conservation of biodiversity assets currently being impacted.
The Department of the Environment recognises that a number of the state and territory governments that own land impacted by P. cinnamomi have developed management plans and operational guides to abate this threat within their own jurisdictions. This TAP aims to complement state and territory approaches to managing P. cinnamomi.
Although this TAP applies to P. cinnamomi, the Department of the Environment acknowledges that recent diagnostic techniques have allowed other species of Phytophthora to be identified in Australia. Some of these species may be widespread and can lead to disease impacts similar to P. cinnamomi within native ecosystems. For further information on these species, a reference list is provided at Appendix B in the background document (Department of the Environment 2014). The control of pathways for the spread of P. cinnamomi and the development of improved control and remediation tools and techniques will also reduce the potential spread and impacts of other Phytophthora species.
1.1 Threat abatement plans and implementation
The EPBC Act prescribes the process, content and consultation to be followed when making a TAP to address a listed key threatening process. Under section 270(A) of the EPBC Act, the Australian Government:
develops TAPs where the Minister agrees that the making of a TAP is a feasible, efficient and effective way to abate a key threatening process.
Under Section 269 of the EPBC Act, the Australian Government:
implements TAPs to the extent they apply in areas under Australian Government control and responsibility. Australian Government agencies must not take any actions that contravene a TAP
seeks the cooperation of the affected jurisdictions in situations where a TAP applies outside Australian Government areas in states or territories, with a view to jointly implementing the TAP.
The success of this TAP will depend on a high level of cooperation between all key stakeholders, including:
Australian Government departments and agencies
state and territory conservation and natural resource management agencies
local governments
research institutes
industry and entrepreneurs, including the forestry, garden and nursery, mining, and road construction industries
the general community, including non-government environmental organisations and private conservation land management bodies, private landholders, Indigenous communities and natural resource management groups.
It will be important that land managers assess the threats and impacts of P. cinnamomi and allocate adequate resources towards effective on-ground prevention of spread and management of impacts, improving the effectiveness of prevention and management programs, and measuring and assessing outcomes.
In order to successfully implement this TAP, the Department of the Environment will:
coordinate its implementation as it applies to Commonwealth land and act in accordance with the provisions of the TAP, as required under the EPBC Act
seek stronger coordination of national action on P. cinnamomi
draw on expertise from state and territory agencies and non-government organisations
encourage involvement of key stakeholders and experts in P. cinnamomi related research and management.
The Australian Government will monitor the uptake and effectiveness of management actions by all parties as part of a review of the TAP under section 279 of the EPBC Act. Where the Australian Government and state and territory governments have mutual obligations, negotiation of appropriate actions and funding of management actions will be undertaken.
1.2 The pathogen
Phytophthora is a major genus within the diploid, alga-like phylum Oomycota (Cooke et al., 2000). This group is currently referred to as water moulds and, although it was previously referred to as fungi, in taxonomic terms it is more closely related to algae. As P. cinnamomi has the ability to cause plant disease and plant death, this document refers to this species of water mould as a pathogen. At least 32 species of Phytophthora occur in various parts of Australia. Other species of Phytophthora, including P. cryptogea, P. megasperma, P. multivora and P. arenaria are also known to cause significant damage in the wild, particularly in Western Australia. However, much more extensive damage has resulted from the presence of P. cinnamomi.
P. cinnamomi was probably introduced to Australia with European settlement and since the mid-1960s, has been recognised as a serious threat to many native plants and ecosystems, important crops and horticultural plants.
P. cinnamomi is known to occur in all Australian states and territories; with the exception of the Northern Territory, where it is generally accepted that the environmental conditions are not conducive to the pathogen’s establishment and persistence in susceptible native plant communities. The area of Australian native vegetation affected by Phytophthora species exceeds a million hectares, and continues to increase. It has been reported that over 1 million hectares are affected in Western Australia alone. Recorded isolations, records of impact and a broad climatic envelope of Phytophthora species susceptibility in Australia are depicted in a map in the background document (Department of the Environment, 2014).
The pathogen is now well established in many of the country's higher rainfall areas (areas with a mean annual rainfall greater than 600 millimetres). Although higher rainfall areas are more favourable, the distribution of P. cinnamomi has been reported in areas with average yearly rainfall as low as 400mm (Brasier and Scott, 1994). The most favourable conditions for spore production are free water and warm temperatures. Soils that are neutral pH to acidic are most favourable for the sporulation and survival of P. cinnamomi (Zentmyer, 1980).
The development of the disease, Phytophthora dieback, requires a number of factors that must operate in concert. These are: the presence of the pathogen; the presence of susceptible host plant species; and environmental conditions that favour infection and subsequent reproduction and spread of the disease (Garkaklis et al., 2004).
Plants become visibly diseased when infection results in the impairment of the plant’s physiological and biochemical functions. Roots are a primary site of infection and therefore uptake of water is one of the first functions affected. This is why symptoms of P. cinnamomi infection have similarities, at least initially, with those of water-stress. For susceptible species, apparently healthy plants (in groups or individually) can suddenly die. Less susceptible species can show crown decline symptoms, including leaf yellowing and death of primary leaf-bearing branches. Epicormic branches with smaller leaves can develop, and over time epicormic branches will decline, with an overall thinning of the crown. Trees with such symptoms can take a number of years to decline and die. The removal of bark at the base of trees just above or below the soil line can reveal areas of necrosis. These necrotic areas effectively girdle the trees and cause death.
P. cinnamomi can be spread in water, soil or plant material that contains the pathogen and dispersal is favoured by moist or wet conditions. It can be carried in both overland and subsurface water flow and by water moving infested soil or organic material. Native and feral animals have been implicated in spreading P. cinnamomi, particularly where there are digging behaviours. Humans, however, have the capacity to disturb and transport more soil than any other vector. Most of the large centres of infestation that exist today in southern temperate Australia occurred as a result of human activity, often as a direct result of the introduction of infested soil or road-building materials to vulnerable un-infested areas (O’Gara et al., 2005b). A list of human assisted spread mechanisms is in section 1.4 of this TAP.
Zoospores from the pathogen can swim short distances in free water. P. cinnamomi grows through roots and can spread to the roots of adjacent plants where root-to-root contact occurs. Root-to-root movement of the pathogen is thought to be one of the major ways in which the pathogen moves upslope (O’Gara et al., 2005b). Under less favourable conditions, P. cinnamomi produces asexual reproductive structures known as chlamydospores, which can survive for several years until conditions improve. Recently, in Western Australia, P. cinnamomi has been shown to survive asymptomatically in a range of native annual and herbaceous perennial species (Crone et al., 2012; Crone et al., 2013a) and in some species to survive as a biotroph. In addition it can, in some hosts, produce numerous selfed oospores which would allow it to survive adverse conditions when necessary (Crone et al., 2013b). These research findings may have important implications for the future management of P. cinnamomi.
It is important to note the intractable nature of disease caused by P. cinnamomi, but also that actions which ameliorate its effects—particularly on endangered species and communities—are vital to the conservation of Australia’s biodiversity.
1.3 Impacts of P. cinnamomi
1.3.1 Ecological impacts on plants
Healthy natural environments provide a range of direct and indirect benefits, which are threatened by disease caused by P. cinnamomi. This disease is often difficult to detect and its impact may be significant before it is detected.
The consequences of infection of susceptible ecological communities include:
a dramatic modification of the structure and composition of the native plant communities
a significant reduction in primary productivity and functionality
habitat loss and degradation for dependent flora and fauna.
Hardham (2005) suggests that P. cinnamomi is likely to infect over 2500 Australian native species. In the South-West Botanical Province Shearer et al. (2004) have shown that approximately 41% of 5710 vascular plant species are susceptible to the pathogen. The pathogen is a threat, or possible threat to 144 native plant species listed as threatened under the EPBC Act (see the list at Appendix A). It may threaten several of these plant species with extinction.
Susceptibility of plant species to disease caused by P. cinnamomi is complex, with considerable variation occurring within plant taxonomic units, making occurrence within a plant family or genus a poor predictor of species susceptibility (Shearer, 2004).
The Centre of Phytophthora Science and Management (CPSM) at Murdoch University has compiled lists of Western Australian native plant species that are resistant to disease caused by P. cinnamomi (Groves et al., 2009a, 2009b). This information is available on the Dieback Working Group website (http://www.dwg.org.au/). Lists of field-resistant upland tropical rainforest species from Queensland are presented in Worboys and Gadek (2004). The lists have been compiled from field observations of resistance and the results of controlled experiments. However, the classification of a plant as resistant to P. cinnamomi often depends on other environmental factors (including climate) which can influence susceptibility to the pathogen. A species’ resistance can also vary depending on the pathogen’s genotype (Howard, 2008). A plant species’ susceptibility occurs on a continuum between resistant and susceptible with genetic components within species, between species and within genera displaying variable susceptibility. As a result, a species should be considered as susceptible when greater than 50 per cent of the genetic population of the plant is killed when confronted by the pathogen.
Investigations over several years have discovered the mechanisms by which a limited number of plants are able to survive infection, including the activation of defence-related genes and signalling pathways, the reinforcement of cell walls and accumulation of toxic metabolites (Professor David Cahill, pers. comm., 2011). Genetically-based, intra-specific variation in resistance has been demonstrated in the Western Australia native hardwood, Eucalyptus marginata (jarrah) (Stukely and Crane, 1994), and in the exotic plantation species Pinus radiata (Butcher et al., 1984).
While P. cinnamomi directly threatens a range of individual plant species, it also threatens ecological communities and landscapes. Large areas of Western Australia, for example, where the pathogen is likely to have been present for over one hundred years, represent post dieback plant assemblages (Dr Joanna Young pers. comm., March 2012).
Indirect impacts on flora have also been demonstrated, for example, in South Australia, EPBC Act listed orchid species (for example Caladenia argocalla, C. behrii, C. rigida) are afforded some measure of protection from herbivores where they are found growing in close proximity to the fronds of Xanthorrhoea semiplana (grass trees). When grass trees become infected with P. cinnamomi and die, the orchids become exposed and are vulnerable to herbivory (Petit and Dickson, 2005).
Multiple processes may interact with P. cinnamomi to increase extinction risk (Barrett et al., 2008). For example, P. cinnamomi activity might be greater in some circumstances following a fire because there are fewer plants to use the available water and sites are more prone to water logging (Cahill et al., 2008).
1.3.2 Ecological impacts on wildlife
Although there has been a substantial amount of research on the effects of P. cinnamomi on vegetation in some states, there has been comparatively little work that has investigated the indirect effects of the disease on faunal populations and communities where food sources or habitat is threatened by the disease (Cahill et al., 2008).
Garkaklis et al. (2004) reviewed the literature on the responses of forest animal communities to the presence of P. cinnamomi. This review indicated that, for a range of forest fauna, serious impacts were either occurring or were plausible but not yet demonstrated. Many of these impacts will arise because of changes in species richness and composition, and alterations to the structural composition of habitats. Species likely to be affected include some listed as endangered under the EPBC Act.
An example recently demonstrated by Dundas et al. (2013), is Tarsipes rostratus (honey possum), that visits many taxa that are susceptible to Phytophthora dieback. The inevitable spread of Phytophthora and its associated changes to vegetation composition is postulated to result in the localised loss of resources for honey possums and is a concern for ongoing conservation management.
1.3.3 Impacts on matters of national environmental significance
EPBC Act listed threatened species or listed threatened ecological communities are matters of national environmental significance protected under the Act. Appendices A and B of this TAP provide details of listed threatened species and ecological communities that are being impacted or that have the potential to be impacted by P. cinnamomi.
Under the EPBC Act, P. cinnamomi is treated as a key threatening process as a result of these impacts or potential impacts, including the potential for the pathogen to cause native species or ecological communities not yet listed to become eligible for listing.
Other matters of national environmental significance impacted, or potentially impacted by the presence of P. cinnamomi (through destruction of vegetation and subsequent damage to an area’s significance) are:
world heritage areas
national heritage places
Commonwealth heritage on Commonwealth lands
Ramsar wetlands (i.e. wetlands listed under the Convention on Wetlands of International Importance).
P. cinnamomi is known to have impacted on the following world heritage areas:
Wet Tropics World Heritage Area of North Queensland. Over 200 patches infected with P. cinnamomi have been found, mostly in wet notophyll vine forests above 700 metres on acid volcanic soils. These forests comprise 14 per cent of the World Heritage Area.
Gondwana Rainforests of Australia World Heritage Area of northern New South Wales and southern Queensland.
Greater Blue Mountains World Heritage Area. Detected in various sites including the Wollemi Pine (listed as endangered) site.
Tasmanian Wilderness World Heritage Area. P. cinnamomi is widespread across Tasmania and also occurs within the World Heritage Area.
Lord Howe Island World Heritage Area. P. cinnamomi has been recorded from one lease in the southern part of the island’s settlement area and could potentially spread to the Lord Howe Island Permanent Park Preserve on footwear or vehicles (DECCW, 2010).
National heritage places for which P. cinnamomi is a threat include:
The Stirling Range National Park and Porongurup National Park in south-west Western Australia. P. cinnamomi is a significant threat to plant communities of outstanding richness and endemicity.
The Grampians National Park (Gariwerd) in Victoria, where P. cinnamomi has been recorded at many sites and longer term studies have shown wide-scale changes in their floristic composition.
Western Tasmania Aboriginal Cultural Landscape.
Ramsar listed sites known to be affected by P. cinnamomi include Lavinia Wetland on the north-east coast of King Island, Tasmania (Parks and Wildlife Service, 2000); the Lake Warden System at Esperance, on the south coast of Western Australia (DEC, 2009); and Forrestdale Lake in Perth, Western Australia (Conservation Commission of Western Australia, 2005).
Although not listed as a matter of national environmental significance under the EPBC Act, an area being significantly impacted by Phytophthora dieback that is of national importance is the Fitzroy River National Park in Western Australia. This area is a reserve site recognised under UNESCO’s[2] Man and the Biosphere Program. The EPBC Act includes provisions for cooperative arrangements between the Commonwealth, states and territories in the development of biosphere reserves.
1.4 Managing the threat
Although P. cinnamomi can be eradicated from small sites and containment methods are available to prevent the spread of the pathogen (Dunstan et al., 2011) further work is required to:
minimise the spread of P. cinnamomi to uninfested sites
mitigate the impact of P. cinnamomi at infested sites.
In order to address the key threatening process listing for P. cinnamomi under section 183 of the EPBC Act, priority must be given to mitigating the impact and minimising the spread of P. cinnamomi in areas containing biodiversity assets of high conservation value. These include areas that:
contain threatened species or ecological communities susceptible to P. cinnamomi
contain habitat susceptible to P. cinnamomi and critical to the survival of threatened fauna.
P. cinnamomi may cause native species or ecological communities not yet listed under the EPBC Act to become eligible for listing (in any category, other than conservation dependent). This means that it is also important to address the impacts and spread of P. cinnamomi in areas that, for example:
support high plant species endemicity
support high species diversity for a type of vegetation
support significant remnant vegetation as per state or territory criteria
are large, ecologically intact and mostly undisturbed
support susceptible species listed as threatened at the state or territory level, but not under the EPBC Act.
1.4.1 Minimising the spread
Humans can spread P. cinnamomi further and faster than any other infestation vector. High risk activities for spread include:
a) Emergency and land management activities
Fire management, including:
– emergency firebreak construction
– fire fighting using P. cinnamomi contaminated water and/or equipment
– movement of contaminated equipment into uncontaminated areas due to non-compliance with, or careless implementation of, hygiene procedures.
Flood mitigation works, involving:
– movement of contaminated gravel, sand, soil etc.
– movement of contaminated equipment
Use of contaminated nursery material and soil disturbance associated with revegetation and restoration activities
Weed and feral animal control activities
b) Recreational activities
Camping
Bushwalking, geocaching, rogaining, orienteering
Fishing and marroning/yabbying
Mountain bike riding
Horse riding
Recreational vehicles (for example motor bikes, quad bikes, four wheel drives).
Trail biking
Hunting
c) Commercial and other activities
Environmental/ecological surveys or research activities (for example flora, fauna, vegetation mapping, geological surveying)
Tourism, particularly ecotourism
Timber and wild flora harvesting
Defence Force training
Mining exploration and mining
Seed collecting
Soil and gravel extraction
Firewood cutting
Apiculture (beekeeping)
Road construction (widening, realignment, maintenance)
Maintenance of recreational tracks and walking trails
Construction of straight line infrastructure (for example powerlines and telecommunication structures)
Propagation and distribution of infected plants, soil and mulch for commercial purposes (for example nursery and gardening industries)
The limited management options available focus on modifying human activities by education, restricting access to certain sites, and, when access is necessary, deploying and enforcing hygiene procedures to minimise the spread of P. cinnamomi in the landscape.
State government agencies have developed documents detailing hygiene methodologies for work and recreation in and around P. cinnamomi management areas. In addition, the Dieback Working Group (Western Australia) has produced Managing Phytophthora dieback in bushland—a guide for landholders and community conservation groups (2008) and NRM South (Tasmania) has published Keeping it Clean (Allan and Gartenstein, 2010). These methodologies are applicable nationally.
Leave No Trace Australia (www.LNT.org.au) is a national and international minimal impact education program for the recreation, tourism, outdoor education, and land and sea management sectors that focuses on biosecurity as one of its strategic awareness outcomes, including Phytophthora dieback awareness. Working with partners at a state, national, and international level across government, non-government and industry sectors, the Leave No Trace program is delivered as a community and formal education program that seeks to raise awareness of natural and cultural heritage values and the appropriate practices to mitigate the threats to those values.
States have prepared useful approaches for training and awareness-raising directed at reducing the spread of the pathogen. For example:
The Western Australian Department of Parks and Wildlife (WA DPAW) is introducing a ‘green card’ program and an environmental code of conduct for contractors. Contractors working on-site are given one half day training on environmental threats, including P. cinnamomi and appropriate responses to these threats. This training could be redeveloped for national use to train staff and contractors working in high priority conservation areas, including land management agency staff.
The Victorian Department of Environment and Primary Industries has a one day workshop, the WeedStop Vehicle Hygiene Program, that can be customised to deal with P. cinnamomi from which participants qualify with a Certificate of Attainment in the nationally accredited unit.
Regional-scale hygiene methodologies have been developed for the Wet Tropics of North Queensland, where dieback management procedures apply to operational works within the World Heritage Area (Worboys and Gadek, 2004).
The use of the biodegradable, systemic fungicide phosphite to assist existing management strategies has been recommended for protection of susceptible vegetation communities (Aberton et al., 1999; Aberton, 2003). The strategic application of phosphite has been shown to reduce the rate of autonomous spread of the pathogen. Phosphite is examined in more detail below.
Major containment and eradication projects for P. cinnamomi have been undertaken by WA DPAW in both the Fitzgerald River and Cape Arid National Parks in Western Australia.
1.4.2 Mitigating the impact
The tools available for mitigating the impact of P. cinnamomi are limited. The strategic use of phosphonic acids (for example phosphite) and selected fumigants has management potential for impact reduction, containment and eradication of the pathogen. An integrated approach with use of these chemicals, strict access and hygiene controls can successfully mitigate the impact and minimise the spread of the pathogen.
a) Phosphite
The term ‘phosphite' refers to salts of phosphonic acid (H3PO3). Phosphite treatment induces a strong and rapid defence response in the treated plant. These defence responses stop pathogen spread in a large number of hosts. Phosphite needs to enter a plant's water transport system in order to be effective. This is achieved by stem injection of phosphite into trees, or spraying phosphite onto the leaves of accessible plants. Injection provides the trees with protection for up to 10 years, while spraying the leaves provides protection for up to one to two years. Efficacy may vary between and within species being treated.
Phosphite has been used to mitigate the impacts of P. cinnamomi on some vulnerable species at infested sites in Western Australia and Victoria. However, phosphite has been found to act as a fertiliser in some circumstances and requires further testing on a greater range of vulnerable species, particularly in other states and territories. Long term phosphite use may have a fertiliser effect in native plant communities occurring on soils with low phosphorous levels resulting in deleterious changes to the plant community (Lambers et al., 2013). The possible deleterious effects of treatment should be included in all monitoring where phosphite is being applied within native plant communities. Further research is required into alternatives to phosphite use.
The Dieback Working Group has produced instruction leaflets on spraying and stem injection of phosphite. These are available on the Dieback Working Group website (http://www.dwg.org.au/).
b) Other impact mitigation methods
A method for eradicating small infestations of P. cinnamomi has been developed and could be applied strategically in suitable areas where priority biodiversity assets occur. The process involves a sequence of treatments: vegetation (host) destruction, fungicide and fumigant treatments, and containment barriers to protect threatened vegetation (Dunstan et. al., 2010). This method greatly increases the potential for eradicating P. cinnamomi in ecosystems with sandy soils, dominated by root-to-root transmission (refer to the case study in the background document for more detail). Eradication efforts in clay or rocky soils dominated by water associated spread have proven more problematic.
A more recent study by Crone et al. (2012) has shown that, from a management perspective, the above technique may not be successful if annual and herbaceous perennial plant species are allowed to remain. These plants, even without symptoms, may act as hosts of P. cinnamomi. Careful consideration must therefore be made as to the circumstances under which host destruction methods are appropriate.
WA DPAW has developed an assessment of site variables that influence whether eradication or containment of P. cinnamomi is likely (see Appendix E in the background document (Department of the Environment, 2014)).
Ex situ conservation of germplasm in seed banks is a well-established technique used to conserve wild plant genetic diversity and may support the management and conservation of plant species and communities. Guidelines have been prepared for plant germplasm conservation in Australia (ANPC, 2009). By contributing to a project to collect and preserve viable seeds in conservation seed banks in Australia (ASBP, 2013), the Department of the Environment has assisted to build a comprehensive and genetically diverse ex situ collection of native plant taxa that are listed as threatened under the EPBC Act that are at risk from P. cinnamomi.
In situ conservation, or translocation, can also be employed. This is the deliberate transfer of plants or regenerative plant material from one place to another for the purpose of enhancing genetic diversity and habitat for conservation. Guidelines for the translocation of threatened plants in Australia (Vallee et al., 2004) take into account the benefits, risks, planning and implementation associated with the strategy.
Breeding for resistance is another potential impact mitigation method. There is considerable variation in resistance within a species or between species within the same genus or subgenus. Enhancing the process of natural selection for resistance may be a longer term management option for many taxa. Future research may also allow for the transfer of resistance genes into those taxa that at present appear to have no resistance. An improved understanding of the genetic basis of resistance and the genetic diversity of P. cinnamomi will be essential for this work. Initially, the availability of samples of P. cinnamomi cultures, isolated and collected from a wide range of natural ecosystems, would facilitate any research.
More information on the use of phosphite, containment activities and other management measures undertaken in Australia can be found in the background document (Department of the Environment, 2014).
1.5 Climate change
It is difficult to predict how changing climate parameters will impact Phytophthora dieback, but it is likely that the distribution and severity of P. cinnamomi infestations will be significantly altered because of climate change. With predicted average temperature increases of between 1°C and 5°C in Australia by the year 2070 (CSIRO and Bureau of Meteorology 2007-2012), it is probable that Phytophthora dieback will extend into areas (for example, arid and higher altitude regions) that were previously unsuitable for the establishment of the pathogen. In contrast, some areas predicted to have reductions in rainfall could become less conducive to pathogen activity or establishment. The effect of vegetation change on soil temperatures is harder to predict than air temperature changes. This may be a major determinant of the changed distribution of P. cinnamomi in some situations. Recent modelling (CPSM, 2013) will be useful to managers and policy makers involved in ensuring the spread and impact of P. cinnamomi is contained in the future. For a more detailed discussion of the potential interactions between P. cinnamomi and climate change, please refer to the background document (Department of the Environment, 2014).
2. Objectives and Actions
The goal of this TAP is to minimise the impacts of P. cinnamomi on matters of national environmental significance (NES) under the EPBC Act and priority biodiversity assets (that will include matters of NES) identified by the actions of this TAP. To achieve this goal, the TAP has three objectives.
1. Identify and prioritise for protection:
biodiversity assets
areas where there is potential for P. cinnamomi to cause native species or ecological communities not yet listed to become eligible for listing under the EPBC Act (in any category, other than conservation dependent).
2. Reduce the spread of P. cinnamomi to, and reduce its impacts on:
identified priority biodiversity assets
areas where there is potential for P. cinnamomi to cause native species or ecological communities not yet listed to become eligible for listing under the EPBC Act (in any category, other than conservation dependent).
3. Communicate information about P. cinnamomi, its impacts on biodiversity and actions under this TAP.
Each objective is accompanied by a set of actions which, when implemented, will help achieve the goal of the TAP. Performance indicators have been established for each action. The priorities stated for actions are relative over the life of the TAP. Timeframes listed for the actions are:
short term, 1–3 years
medium term, 3–5 years
long term, more than 5 years
ongoing.
Research actions have been identified that will the support the TAP to achieve its goal. These are listed at the end of this section.
Objective 1: Identify and prioritise for protection biodiversity assets that are, or may be, impacted by P. cinnamomi
There is a need to determine the risks P. cinnamomi poses to biodiversity assets across Australia and develop a list of national priority biodiversity assets for protection. Attention is drawn to the discussion in the background document on state-based approaches to the assessment of risks from P. cinnamomi.
Appendix A shows EPBC Act listed plant species which may be at risk from P. cinnamomi. Appendix B shows EPBC Act listed threatened ecological communities that may be at risk from P. cinnamomi. Although understanding of plant species’ susceptibility and impacts on dependent wildlife is still developing, these lists provide a starting point for prioritisation.
Threatened species and communities are also listed under state and territory legislation. Australian Government and state/territory lists do not necessarily align, creating the potential for inconsistency in priorities.
Risk assessment methodologies should be the basis for governments in setting management priorities and allocating resources. The risk assessment process extends beyond those susceptible plant species and ecological communities that are currently listed as threatened under the EPBC Act. It also covers those that are at risk of becoming listed due to factors such as proximity to infested areas, and extends to habitat dependent wildlife and plant species that may be impacted by Phytophthora dieback.
Action
Responsible party
Priority
Timeframe
Performance indicators
Action 1.1Identify species and communities at risk from P. cinnamomi through assessing state/territory and Commonwealth lists of threatened species.
Australian Government
High priority
Short term
Assessment of threatened species and communities that may be impacted completed and the Threatened Species Scientific Committee advised with 12 months of the making of this TAP.Gaps and synergies identified to inform management.
Action 1.2Identify impacts and prioritise flora, fauna and communities at risk to inform P. cinnamomi management.
Australian Government and state and territory governments
High priority
Medium term
Flora and fauna species at risk are identified and prioritised.Ecological communities at risk are identified and prioritised.The threat of Phytophthora dieback is evaluated in Commonwealth recovery plans.
Action 1.3Identify risk areas spatially to generate lists of biodiversity assets at risk from Phytophthora dieback—develop or utilise existing prioritisation frameworks.
Australian Government and state and territory governments
High priority
Medium term
Risk areas identified spatially within three years of the making of this TAP through preparation of:maps of potential national distribution of pathogenmaps of priority biodiversity assets.
Action 1.4Identify priority biodiversity assets and areas for protection at a local scale—develop or utilise existing prioritisation frameworks.
State, territory and local governments
High priority
Medium term
Revise and produce local scale maps of priority biodiversity assets and protection areas.
Action 1.5Improve and maintain current monitoring programs.
Australian Government and state and territory governments
Very high priority
Medium term
New infestations in areas of priority biodiversity assets and protection areas are detected and monitored annually.
Objective 2: Protect priority biodiversity assets through reducing the spread and mitigating the impacts of P. cinnamomi.
To direct the limited resources available for implementing threat abatement activities to the greatest benefit, this TAP directs action to safeguard priority biodiversity assets from the spread of P. cinnamomi both to them and within them. It also directs action to mitigate the impacts of P. cinnamomi on priority biodiversity assets.
Action
Responsible party
Priority
Timeframe
Performance indicators
Action 2.1Assess the appropriateness of registration of phosphite for management of P. cinnamomi in natural ecosystem contexts.If appropriate and feasible, initiate registration by the Australian Pesticides and Veterinary Management Authority.
State and territory governments
High priority
Short term
Phosphite is assessed for its appropriateness to be registered as a control method for Phytophthora dieback in natural systems.Required research is identified and conducted for registration (if appropriate).Process for registration of phosphite for national use in natural ecosystem contexts has commenced (if appropriate).
Action 2.2Implement control actions to protect priority biodiversity assets (as identified under Objective 1) from the impacts of P. cinnamomi.
Australian Government and state, territory and local governments
High priority
Ongoing
Quarantine and hygiene measures for priority biodiversity assets are implemented during the life of this TAP.Where suitable eradication, containment or control methods are applicable, these are implemented throughout the life of this TAP (e.g. eradicate small infestations to protect high value healthy catchments).Ex situ conservation of species at risk is undertaken at appropriate facilities that manage the risk of P. cinnamomi introduction.
Action 2.3Develop and implement practices to minimise the inadvertent spread of P. cinnamomi to priority biodiversity assets.
Australian Government, state, territory and local governments and relevant industries conducting high-risk activities (e.g. forestry, garden/nursery, road construction, recreation, mining and tourism)
High priority
Short term and ongoing
Risk reduction plans (prevention, impact reduction, containment, stakeholder engagement, communication materials including signage, monitoring) for priority protection areas and biodiversity assets are prepared.Implement a voluntary certification scheme Australia-wide for high risk materials such as nursery materials, soils, quarry products and road and track building material.Pathogen-tested raw materials, compliant with a best practice certification scheme, are used in high-risk infestation pathways such as soil and nursery materials.
Action 2.4Integrate management of P. cinnamomi with other natural resource management systems.
Australian Government and state and territory governments
Medium priority
Medium term
State and territory governments have adopted integrated hygiene procedures for works in native vegetation to manage pests, weeds and disease risks.P. cinnamomi management is integrated with other compatible land management programs such as revegetation, fire, weed and pest management and road maintenance programs.
Action 2.5Prepare guidelines to minimise risks from P. cinnamomi arising from Australian Government environment funding programs.
Australian Government
High Priority
Medium term
Guidelines to minimise risks from P. cinnamomi arising from Australian Government environment funding programs are developed and communicated within 12 months of making this TAP.
Objective 3: Communication and training
Many people are unaware of the significance of P. cinnamomi and the ways it can be spread. Ongoing delivery of awareness and capacity building programs in natural resource management at national, state and regional level can make a significant contribution to national implementation of the TAP.
In order to inform and empower stakeholders, particularly land managers and land users, to take actions that collectively minimise the spread and reduce the impacts of P. cinnamomi it is necessary to effectively communicate:
the approach adopted in this TAP
the scale of the threat to biodiversity posed by P. cinnamomi
the priority biodiversity assets that need protection
information for land managers, recreational users, ecotourism operators and other stakeholders on the tools and practices that will minimise the inadvertent spread of P. cinnamomi
the necessity for land managers in conservation, forestry, horticulture, agriculture, and water resources to be trained to an appropriate level in the science and management of P. cinnamomi
the need for integration of P. cinnamomi management, education and training with other natural resource management activities.
A number of networks of conservation groups and researchers with an interest in P. cinnamomi already exist. Networks such as the Dieback Working Group, Project Dieback in Western Australia, Leave No Trace Australia and the Australian Network for Plant Conservation can assist in communicating developments in the management of P. cinnamomi, host susceptibility and other issues. The appointment of a Dieback Coordinator to relevant local government areas may also assist in providing guidance and coordination for dieback matters at the local and regional scale.
Action
Responsible party
Priority
Timeframe
Performance indicators
Action 3.1Determine stakeholders, key messages and the most efficient means of communicating with stakeholders on issues relating to P. cinnamomi impacts on priority biodiversity assets.
Australian Government and state and territory governments
High priority
Medium term and ongoing
Effective communication actions are progressed during the life of the TAP.Research and other findings are assessed, documented and communicated to stakeholders.
Action 3.2Build awareness and develop and provide training for industry, land and tourism managers, peak organisations (recreation and outdoor education) and recreation clubs and societies.
Australian Government, state and territory governments and industry
Medium priority
Short term and ongoing
Training material on the methodologies involved in detection, diagnosis and management of P. cinnamomi are developed or updated, as required and made available. This material is then integrated into training associated with land planning and management, and biodiversity conservation.Industry-specific codes of practice for the management of P. cinnamomi are readily available and implemented by the proponents of activities in high-risk areas and high-value sites, including: supply of nursery materials; transporting of soil; quarrying; road and track building; land restoration; natural area recreation such as bushwalking, motorised recreation, fishing, hunting and mountain-biking; agriculture and horticulture; and the disposal of P. cinnamomi infested material.
Action 3.3Ensure that guidelines, including codes of practice and standard operating procedures, for managing P. cinnamomi are available to key stakeholders and are implemented, reviewed and updated.
Australian Government and state, territory and local governments
High priority
Ongoing
Up to date guidelines, including codes of practice and standard operating procedures, are available electronically and in hard copy to key stakeholders and reviewed in terms of their effectiveness on an ongoing basis.
Action 3.4Develop or adopt a national system of signage and alerts to guide park visitors and land managers in affected priority areas.
Australian Government and state, territory and local governments
Medium priority
Medium term
A national system of signage and alerts using standardised placement requirements and terminology is available for use in managing P. cinnamomi in priority areas.
Action 3.5Acquire and maintain up to date information on P. cinnamomi and the progress of the TAP.
Australian Government
Medium priority
Ongoing
The Department of the Environment website holds and maintains up to date information reflecting the achievements against TAP actions.The Department of the Environment hosts a forum with key stakeholders to assist in implementation of the plan and to review achievements of the plan.The Department of the Environment reviews research actions, disseminates new information and promotes the uptake of findings.
Research actions
Research will contribute to informing the implementation of the objectives of this plan through improving our understanding of the pathogen and developing control and restoration techniques.
Action
Responsible party
Priority
Timeframe
Performance indicators
Research action 1Encourage new partnerships (e.g. through the Australian Research Council or forestry, mining and nursery industries) to support the funding of research relating to the management of P. cinnamomi (and other Phytophthora species).
Australian Government, state and territory governments, research organisations and industry
High priority
Ongoing
Partnerships are initiated within 12 months of this TAP being made.
Research action 2Increase understanding of factors affecting pathogen distribution and expression (including climate change).
Australian Government, state and territory governments, research organisations and industry
Medium priority
Medium term
Material on factors affecting pathogen distribution and expression is published.Further research is conducted into the mechanisms of spread and survival of P. cinnamomi, assessing its long term direct and indirect impacts in the range of priority ecosystems it affects.
Research action 3Undertake susceptibility/natural resistance screening of priority species.
State and territory governments, research organisations and industry
Medium priority
Medium term
Susceptibility screening of priority species is undertaken at appropriate facilities using plant material from ex situ programs (where available).Infested sites are monitored for resistant individuals or populations to enable the sourcing of material for resistance screening.
Research action 4Develop improved techniques for rapid diagnosis of P. cinnamomi infestation, e.g. building on existing efforts for detection via water sampling, testing large volumes of soil (or quarried material) or remote methods such as use of digital multi-spectral imagery.
State and territory governments, research organisations and industry
Very high priority
Medium term
Rapid diagnosis systems for identifying P. cinnamomi infestations are evaluated for use in natural ecosystems.Cost effective and accurate methods for the rapid diagnosis of P. cinnamomi species are available.
Research action 5Assess current disease management practices and explore scope for improvement.
Australian Government, state and territory governments and research organisations
High priority
Medium term
Methods to eradicate P. cinnamomi from small, infested sites are identified and assessed for their relative efficacy.The efficacy of phosphite in the control of P. cinnamomi across a range of susceptible ecological communities is determined.The effects of phosphite on non-target species are identified.Alternatives to phosphite for controlling P. cinnamomi are identified and their relative efficacy assessed. This may include, but is not limited to: potential biocontrol options and other chemicals to augment/supplement phosphate.The efficacy of hygiene protocols for controlling disease spread are assessed and implementation improved (this could include the efficacy of implementation practices).
Research action 6Undertake further (new) research into efficient and cost effective (nationally applicable) techniques for:eradication methods for soil types other than porous soils (for which a method exists)management of impact through transferring resistant genes into taxa that show little resistance to P. cinnamomi.
Australian Government, state and territory governments and research organisations
High priority
Ongoing
Collaborative applied research projects are undertaken to test and improve eradication and species resistance.
Research action 7Develop methods for restoration of priority sites that are degraded by P. cinnamomi.
Australian Government, state and territory governments and research organisations
Medium priority
Ongoing
Novel restoration and revegetation techniques for priority sites degraded by P. cinnamomi are developed over the life of this TAP, using resistant plant species.Resistant species that may provide structure and food sources for priority species are introduced into impacted priority areas.
Research action 8Establish repositories for collections of P. cinnamomi cultures and nationally available standards for collection and analysis of P. cinnamomi samples, in order to facilitate research on the genetic basis of resistance and genetic diversity of P. cinnamomi.
Australian Government, state and territory governments and research organisations
Medium priority
Medium term
Cultures of P. cinnamomi are able to be tested against samples available through a complete and accessible national repository for cultures of P. cinnamomi isolated from natural ecosystems.National standard methods are used by laboratories for the collection and analysis of soil, plant and water samples for the presence of P. cinnamomi.
3. Duration, Review, Funding and Implementation
3.1 Duration and review of the plan
Section 279 of the EPBC Act provides for the review of this TAP at any time and requires that it be reviewed by the Minister at intervals of no longer than five years. During the life of the TAP, the Minister’s scientific advisory committee (the Threatened Species Scientific Committee), will be provided with updates of actions taken under this TAP to aid them in advising the Minister on the effectiveness of the TAP in abating the key threatening process.
3.2 Funding and implementation
It is important to note that TAPs are not linked directly to any Australian Government funding programs. Each financial year, the Australian Government funds TAP development and implementation as part of a broader budget outcome related to biodiversity conservation (www.environment.gov.au/about/publications/budget/index.html). The Department of the Environment allocates its annual budget to a range of competing biodiversity conservation priorities. The budget provided by The Department of the Environment for the implementation of individual TAPs may vary from year to year as a range of biodiversity conservation priorities are addressed.
The total cost of implementing this TAP cannot be quantified at the time of its writing. Projects that are to be undertaken by the Australian Government will need to be procured in accordance with the Commonwealth Procurement Rules. The cost of individual projects will not be accurately known until a process to test the market (for example to obtain quotes or tenders for those projects) has been undertaken.
The Australian Government recognises that the capacity of each state or territory government to implement this TAP will be dependent on the resources of that state or territory and the methods of implementation they choose to adopt.
The mining, tourism, horticulture and forestry industries have an interest in protecting biodiversity from the impacts of P. cinnamomi. Joint delivery of projects and/or corporate sponsorship from such groups for research and management should be encouraged.
P. cinnamomi occurs in dynamic and evolving cultural landscapes where customary rights and legal and land management changes acknowledge and enable customary activities to take place. Significant opportunities exist to engage and work with Indigenous organisations and custodians of country to achieve the objectives of this TAP.
4. Glossary and Abbreviations
Biodiversity
Variability among living organisms from all sources (including terrestrial, marine and other ecosystems and ecological complexes of which they are part), which includes diversity within species and between species and diversity of ecosystems (Beeton et al., 2006).
Conservation dependent
A native species is eligible to be included in the conservation dependent category of the Environment Protection and Biodiversity Conservation Act 1999 at a particular time if, at that time the species is the focus of a specific conservation program the cessation of which would result in the species becoming vulnerable, endangered or critically endangered.
EPBC Act
Environment Protection and Biodiversity Conservation Act 1999 (Commonwealth legislation).
Eradication
Application of measures to eliminate an invasive alien species from a defined area.
Key threatening process
As defined in and listed under the EPBC Act a process that threatens or may threaten the survival, abundance or evolutionary development of a native species or ecological community.
Matters of national environmental significance
Under the EPBC Act, actions that have, or are likely to have, a significant impact on a matter of national environmental significance require approval from the Australian Government Minister for the Environment (the minister). The minister will decide whether assessment and approval is required under the EPBC Act.The eight matters of national environmental significance protected under the EPBC Act are:world heritage propertiesnational heritage placeswetlands of international importance (listed under the Ramsar Convention)listed threatened species and ecological communitiesmigratory species protected under international agreementsCommonwealth marine areasthe Great Barrier Reef Marine Parknuclear actions (including uranium mines).
Performance indicator
A criterion or measure that provides information on the extent to which a policy, program or initiative is achieving its outcomes.
Priority biodiversity asset
Includes matters of national environmental significance listed under the EPBC Act and other plants, animals and communities prioritised under Objective 1 of this TAP for protection or remediation.
Threat abatement plan
Under the EPBC Act (sections 268–284), a plan providing for the research, management, and any other actions necessary to reduce the impact of a listed key threatening process on a threatened species or ecological community.
Threatened species
Species under the EPBC Act listed as critically endangered, endangered, vulnerable or conservation dependent.
5. References
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Aberton MJ, Wilson BA, Hill J & Cahill DM 2003, ‘Phosphite controls Phytophthora cinnamomi at Anglesea and Wilson's Promontory National Park, Victoria’, in Phytophthora in Forests and Natural Ecosystems: 2nd International IUFRO Working Party 7.02.09 Meeting, 30 September – 5 October, 2001, Albany, Western Australia.
Allan K & Gartenstein S 2010, Keeping it clean—A Tasmanian field hygiene manual to prevent the spread of freshwater pests and pathogens, NRM South, Hobart, Tasmania.
ANPC—see Australian Network for Plant Conservation.
Australian Network for Plant Conservation (ANPC) 2009, Plant germplasm conservation in Australia: Strategies and guidelines for developing, managing and utilising ex situ collections, Offord CA, Meagher PF (eds), p. 204.
Australian Seed Bank Partnership (ASBP) 2013, Ex situ collections of Australian flora threatened by Phytophthora cinnamomi, Australian Seed Bank Partnership report for the Australian Government Department of Sustainability, Environment, Water, Population and Communities, <www.environment.gov.au/biodiversity/invasive/projects/index.html>.
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Brazier CM & Scott JK 1994, ‘European oak declines and global warming: a theoretical assessment with special reference to the activity of Phytophthora cinnamomi’, EPPO Bulletin, vol. 24, pp. 221–232.
Butcher TB, Stukely MJC & Chester GW 1984, ‘Genetic variation in resistance of Pinus radiata to Phytophthora cinnamomi’, Forest Ecology and Management, vol. 8, pp. 197–220.
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Conservation Commission of Western Australia 2005, Forrestdale Lake Nature Reserve management plan, prepared by the Department of Conservation and Land Management, Western Australia, p. 63.
CPSM—see Centre for Phytophthora Science and Management.
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Crone M, McComb JA, O’Brien PA, & Hardy GEStJ 2013a, ‘Assessment of Australian native annual/herbaceous perennial plant species as asymptomatic or symptomatic hosts of Phytophthora cinnamomi under controlled conditions’, Forest Pathology, vol. 43, pp. 245–251.
Crone M, McComb JA, O’Brien PA & Hardy GEStJ 2013b, ‘Survival of Phytophthora cinnamomi as oospores, stromata and thick walled chlamydospores in roots of symptomatic and asymptomatic annual and herbaceous perennial plant species’, Fungal Biology, vol. 117 (2), pp. 112–123.
CSIRO—see Commonwealth Scientific and Industrial Research Organisation.
DEC—Department of Environment and Conservation (WA).
DECCW—see Department of Environment, Climate Change and Water (NSW).
Department of Environment, Climate Change and Water (NSW) 2010, Lord Howe Island Permanent Park Preserve plan of management.
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DPAW—see Department of Parks and Wildlife (WA); formerly the Department of Environment and Conservation (WA).
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Appendix A
Threatened flora species known to be susceptible to P. cinnamomi
Species shown in Appendix A are listed as threatened under the Commonwealth Environment Protection and Biodiversity Conservation Act 1999 and are known to be susceptible to disease from P. cinnamomi infection.
Susceptibility information is from O’Gara et al. (2005a), which compiles published material, unpublished records and observations of individual researchers on the responses of native plants to P. cinnamomi. For further detail relating to native species not listed under the EPBC Act, please refer to O’Gara et al. 2005a.
Several additional EPBC listed species were confirmed as susceptible by Barrett et al. (2008), Kueh et al. (2012) and Tim Rudman pers. comm. (2012).
This list was compiled on the basis of threatened ecological communities occurring within the climatic zone in which conditions for P. cinnamomi are favourable. The list was refined in consultation with state agencies.
