01974nas a2200181 4500008004100000245013500041210006900176260001600245300001400261490000700275520133800282100001301620700001601633700001701649700002101666700001401687856009101701 2014 eng d00aHost removal as a potential control method for Phytophthora cinnamomi on severely impacted black gravel sites in the jarrah forest0 aHost removal as a potential control method for Phytophthora cinn cJan-04-2014 a154 - 1590 v443 a

Removal of living plants from an area of Eucalyptus marginata (jarrah) forest on black gravel sites infested with Phytophthora cinnamomi significantly reduced subsequent pathogen recovery. Vegetation, including trees and annual and herbaceous perennial plants, was killed on the sites by herbicide application. To determine whether this treatment efficiently eliminated P. cinnamomi, soil samples were seasonally collected and baited to test for the presence of the pathogen. There were no recoveries on treated sites in autumn, 28 months after removal of all vegetation by herbicide application. To test whether this was the result of the complete elimination of the pathogen or whether inoculum remained, regrowth on sites was not controlled after this period leading to the re-establishment of annual and herbaceous perennial species, some of which are hosts of P. cinnamomi. Recovery of P. cinnamomi after plant regrowth on the formerly treated sites indicated that for complete pathogen removal, sites need to remain free of vegetation for longer than 28 months. Overall, however, this study confirms that the pathogen is a weak saprophyte, and withdrawal of host material for a period of time may make eventual rehabilitation of these sites possible.

1 aCrone, M1 aMcComb, J A1 aO'Brien, P A1 aHardy, St, G E J1 aAndrea, V uhttp://doi.wiley.com/10.1111/efp.2014.44.issue-2http://doi.wiley.com/10.1111/efp.1208001756nas a2200181 4500008004100000245016900041210006900210260001200279300001400291490000700305520111500312100001301427700001601440700001701456700002101473700001401494856006601508 2013 eng d00aAssessment of Australian native annual/herbaceous perennial plant species as asymptomatic or symptomatic hosts of Phytophthora cinnamomi under controlled conditions0 aAssessment of Australian native annualherbaceous perennial plant c06/2013 a245–2510 v433 a

Phytophthora cinnamomi is a necrotrophic pathogen of woody perennials and devastates many biomes worldwide. A controlled perlite–hydroponic system with no other hyphae-producing organisms as contaminants present allowed rapid assessment of ten annual and herbaceous perennial plant species most of which have a wide distribution within the jarrah (Eucalyptus marginata) forest in Western Australia where this pathogen has been introduced. As some annuals and herbaceous perennials have recently been reported as symptomatic and asymptomatic hosts, laboratory screening of some of the field-tested annuals and herbaceous perennials and additional species was used to further evaluate their role in the pathogen's disease cycle. Nine of the species challenged with the pathogen were asymptomatic, with none developing root lesions; however, Trachymene pilosa died. The pathogen produced thick-walled chlamydospores and stromata in the asymptomatic roots. Furthermore, haustoria were observed in the roots, indicating that the pathogen was growing as a biotroph in these hosts.

1 aCrone, M1 aMcComb, J A1 aO'Brien, P A1 aHardy, St, G E J1 aAndrea, V uhttp://onlinelibrary.wiley.com/doi/10.1111/efp.12027/abstract02199nas a2200253 4500008004100000022001400041245018100055210006900236260001200305300001400317490000700331520137600338653001201714653001701726653001801743653002201761653002701783653002601810100001301836700001601849700001901865700002101884856004001905 2012 eng d a1365-305900aAnnual and herbaceous perennial native Australian plant species are symptomless hosts of Phytophthora cinnamomi in the Eucalyptus marginata (jarrah) forest of Western Australia0 aAnnual and herbaceous perennial native Australian plant species  c11/2012 a245–2510 v433 a

Resistant annual and herbaceous perennial plant species were identified as key hosts which allow Phytophthora cinnamomi to persist on severely impacted black gravel sites within the Eucalyptus marginata (jarrah) forest of southwest Western Australia. Of the annual and herbaceous perennial plant species present on black gravel sites, 15 out of 19 species were found to be hosts of P. cinnamomi, and 10 of these were symptomless hosts. In particular, the native annual Trachymene pilosa and the two native herbaceous perennials Stylidium diuroides and Chamaescilla corymbosa were commonly found to be hosts of the pathogen. Species from 12 new genera including three from new families (Crassulaceae, Droseraceae and Primulaceae) are reported for the first time to be hosts of P. cinnamomi. The species from which P. cinnamomi was recovered were the native species: Chamaescilla corymbosa, Crassula closiana, Drosera erythrorhiza, Hydrocotyle callicarpa, Levenhookia pusilla, Paracaleana nigrita, Podotheca angustifolia, Pterochaeta paniculata, Rytidosperma caespitosum, Siloxerus multiflorus, Stylidium diuroides and Trachymene pilosa, and the introduced annual weeds Hypochaeris glabra, Lysimachia arvensis and Pentameris airoides.

10adieback10ahost species10ajarrah forest10apathogen survival10aPhytophthora cinnamomi10asusceptibility rating1 aCrone, M1 aMcComb, J A1 aO’Brien, P A1 aHardy, St, G E J uhttp://dx.doi.org/10.1111/ppa.12016