02169nas a2200253 4500008004100000022001400041245013800055210006900193260002900262300001400291490000700305520136800312653002201680653001301702653002701715653002101742100001701763700001601780700001201796700001501808700001501823700002201838856005501860 2012 eng d a1365-305900aPotential susceptibility of Australian native plant species to branch dieback and bole canker diseases caused by Phytophthora ramorum0 aPotential susceptibility of Australian native plant species to b bBlackwell Publishing Ltd a234–2460 v613 a

Susceptibility to branch dieback caused by Phytophthora ramorum was tested using a detached branch assay for 66 Australian native plant species sourced from established gardens and arboreta in California. Six of these species were further tested for their susceptibility to bole cankers caused by P. ramorum using a sealed log assay. Isopogon formosus and Eucalyptus denticulata were identified as potentially highly susceptible Australian branch dieback hosts. Thirteen potentially tolerant Australian host species included Banksia attenuata, B. marginata, E. haemastoma, E. regnans, Pittosporum undulatum and Billardiera heterophylla. Eucalyptus regnans was identified as a potentially highly susceptible bole canker host, while E. diversicolor and E. viminalis were considered potentially tolerant species to bole cankers caused by P. ramorum. Phytophthora ramorum was able to infect all 66 species, as confirmed by reisolation. These results extend the known potential host range for P. ramorum, confirm it as a possible threat to Australian plant industries and ecosystems and highlight additional associated hosts that are important in the global horticultural trade, native forests and plantation forestry.

10ainvasive organism10aoomycete10aramorum branch dieback10aSudden oak death1 aIreland, K B1 aHüberli, D1 aDell, B1 aSmith, I W1 aRizzo, D M1 aHardy, St., G E J uhttp://dx.doi.org/10.1111/j.1365-3059.2011.02513.x