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Black Scab of Jojoba (Simmondsia chinensis) in Australia Caused by a Putative New Pathotype of Elsinoë australis

May 2012 , Volume 96 , Number  5
Pages  629 - 634

G. J. Ash and B. Stodart, E. H. Graham Centre for Agricultural Innovation (Department of Primary Industry and Charles Sturt University), School of Agricultural and Wine Sciences, P.O. Box 588 Wagga Wagga, NSW 2678, Australia; and J.-W. Hyun, Citrus Experiment Station, National Institute of Horticultural & Herbal Science, R.D.A. Jeju, 697-943, Korea

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Accepted for publication 9 November 2011.

A new disease of jojoba in Australia is described. We have demonstrated that this disease is caused by Elsinoë australis, a pathogen which is normally associated with citrus. This pathogen has not been found previously in Australia on citrus or any other crop. The fungus causes a scab on leaves and stems of jojoba and is widely distributed in eastern Australia. Although molecular analysis of the pathogen indicates that it is closely related to the natsudaidai and the sweet orange pathotypes of E. australis, glasshouse and laboratory experiments demonstrate that it is not pathogenic to a range of citrus cultivars grown in Australia. The data indicate that the isolates from jojoba represent a new pathotype of E. australis.

© 2012 The American Phytopathological Society