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Development of disease caused by Phytophthora cinnamomi in mature Xanthorrhoea australis

Aberton, M.J., Wilson, B.A., Hill, J. and Cahill, D.M. (2003) Development of disease caused by Phytophthora cinnamomi in mature Xanthorrhoea australis. In: Phytophthora in Forests and Natural Ecosystems: 2nd International IUFRO Working Party 7.02.09 Meeting, 30 September - 5 October, 2001, Albany, Western Australia.

Abstract

Xanthorrhoea australis (Austral Grass-tree) is a species identified to be a good indicator of disease caused by Phytophthora cinnamomi in native forests and heathlands within Victoria. The plant is under serious threat from P. cinnamomi invasion and shows rapid death upon first infection from the disease. This research shows that the proportion of disease within the plant is relative to the disease symptoms or decline stage (DS) shown by the plant in the form of chlorosis to leaves. Plants showing severe disease symptoms had 67% and 86% of roots infected, while those with less severe disease symptoms had 40% of roots infected. One dead plant and all healthy plants had no infected roots. Isolation of the pathogen from roots showed a large variation in distribution of the pathogen within the roots of each plant. Microscopy showed that the pathogen is situated through xylem and metaxylem within the roots. Massive lesions were located in plants with severe disease symptoms but isolation from these lesions proved difficult.

Publication Type: Conference Item
Murdoch Affiliation: Centre for Phytophthora Science and Management
Notes: Conference abstract - appears in 'Phytophthora in Forests and Natural Ecosystems'. 2nd International IUFRO Working Party 7.02.09 Meeting, Albany, W. Australia 30th Sept.- 5th Oct 2001 Eds. JA McComb, GE StJ Hardy and IC Tommerup (Murdoch University Print) pp 244
URI: http://researchrepository.murdoch.edu.au/id/eprint/4362
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