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Marri Leaf, shoot and Fruit Blight

Marbus, C., Paap, T., Burgess, T., Dell, B. and Hardy, G.E.S.J. (2010) Marri Leaf, shoot and Fruit Blight. In: Dieback Information Group Conference ('10), 16 July, Perth, Western Australia.

Abstract

Decline of Corymbia calophylla (marri) in the south-west of Western Australia (WA) has been an increasing source of concern in recent years, due to a canker disease caused by Quambalaria coyrecup. More recently Q. pitereka has been implicated in leaf and shoot blight, which has been observed over the last five years to extend to flowering parts at all stages of development. This symptomology is not typical of Quambalaria shoot blight (QSB) in its origin of eastern Australia, and this study is the first investigation of the disease on flowering structures. Marri flowers are invaluable to the W A beekeeping industry and to native fauna, for which reason this study was conducted to ascertain the extent, causes and possible impacts of the disease. Six surveys conducted over a 13 month period determined that QSB was widespread over the C. calophylla distribution range, causing deformities and early termination of flowering structures, and was associated with three different species of Quambalaria. DNA sequen6es of 23 isolates obtained in this study confirmed the presence of Q. cyanescens and Q. pitereka with the latter identified as the primary blight pathogen of both vegetative and reproductive tissues.

Publication Type: Conference Item
Murdoch Affiliation: School of Biological Sciences and Biotechnology
URI: http://researchrepository.murdoch.edu.au/id/eprint/12130
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