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Variability in Susceptibility of Some Banksia Species to Phytophthora cinnamomi and Their Distribution in Australia. J. J. Cho, Associate Plant Pathologist, Department of Plant Pathology, University of Hawaii. Hitahr, Maui Branch, Kula 96790. Plant Dis. 67:869-871. Accepted for publication 21 January 1983. Copyright 1983 American Phytopathological Society. DOI: 10.1094/PD-67-869.

The relative susceptibility of 1-mo-old seedlings of 29 Banksia species to Phytophthora cinnamomi was compared in two greenhouse pot studies. Eight species, B. asplennifolia, B. collina, B. ericifolia, B. integrifolia, B. paludosa, B. robur, B. serrata, and B. serratifolia, were resistant to P. cinnamomi. All eight species are native to the coastal regions of eastern Australia. Nine species, B. ashybi, B. baxterii, B. candolleana, B. hookerana, B. laricina, B. lindeleyana, B. prionotes, B. sceptrum, and B. speciosa, were highly susceptible to the fungus. In a separate experiment, no difference in susceptibility between cuttings and seedlings of the same species was detected.

Keyword(s): Proteaceae, root rot.