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Coniothyrium stem canker of Eucalyptus

Scientific Name
Coniothyrium zuluense
Scientific Author
M.J. Wingf., Crous & T.A. Cout.
Taxonomy
Anamorphic fungi

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Diagnostic Images (4)
Diagnostic Notes
Symptoms:

The pathogen causes small, necrotic spots on the young green stems of Eucalyptus, which later coalesce and form large cankers that eventually girdle susceptible trees and kill its top (Wingfield et al. 1997). Abundant kino exudation and formation of kino pockets in the xylem are caused by the disese (Gezahgne et al. 2003). The lesions restrict bark peeling prior to pulping (Roux et al. 2002).

The fungus:

Pycnidia single or aggregated, 2—15 µm in diameter, globose or depressed, 60—120 µm wide, exuding spores in dark brown masses; Conidiogenous cells annellidic, pale brown, smooth, doliiform to reinform, 4-8 x 2.5—3.5 µm. Conidia medium brown, thick-walled, smooth to verruculose, broadly ellipsoid, apex obtuse, base subtruncate to bluntly rounded, mostly 4.5—5 x 2—2.5 µm. Spermatia hyaline, rod-shaped, 3—4 x 1.5—2 µm (Wingfield et al. 1997).

Note: Additional information is given by Wingfield et al. (1997) and Van Zyl et al. (2002ab).
More Information
Specimen Contact
Dr Jose R. Liberato
Author
Liberato JR & Pegg GS
Created
24/07/2006 03:34 AEST
Last Updated
26/07/2016 10:54 AEST
Citation
Liberato JR & Pegg GS (2006) Coniothyrium stem canker of Eucalyptus (Coniothyrium zuluense ) Updated on 7/26/2016 10:54:43 AM Available online: PaDIL - http://www.padil.gov.au.
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Free for use under the Creative Commons Attribution 3.0 Australia License

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