Technique for Rapid Assessment of Tolerance ofBanksiaspp. to Root Rot Caused byPhytophthora cinnamomi

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Abstract
The technique of stem wound inoculation is described that provides a rapid, reliable method of assessing and calibrating tolerance of Banksia spp. to root rots caused by P. cinnamomi. Inoculated intact stems and excised stem-cuttings developed characteristic lesion lengths. Similar results for the relative susceptibility of a species were obtained using wound-inoculating and zoospore root-drenching procedures. Both techniques showed B. ashbyi, B. verticillata, B. victoriae and B. prionotes susceptible and B. baueri tolerant to P. cinnamomi. Root lesions were difficult to measure because of secondary infection and irregularities in root morphology. Using intact, field-grown plants, stem lesion length was useful for assessing interspecific and intraspecific tolerance of Banksia spp.

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