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Alternaria brassicicola

Scientific Name
Alternaria brassicicola
Scientific Author
(Schwein.) Wiltshire
Taxonomy
(Ascomycota: Dothideomycetes: Pleosporales: Pleosporaceae)
Pest Status
1 NZ - Non-regulated species
Status
NZ - Exotic
Reliability
High
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Diagnostic Images

Conidia
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Caption
Alternaria brassicicola conidia
Source
E. McKenzie Landcare Research
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Diagnostic Images (5)
Diagnostic Notes
Disease

Black leaf spot. Circular, zonate spots up to 1cm diam., generally darker than those caused by A. brassicae. May cause damping-off when infected seed is sown.

Morphology

Conidiophores arising singly or in groups of 2-12, pale to mid olivaceous brown, up to 70 µm long, 5-8 µm thick, usually unbranched, with one or more distinct conidial scars. Conidia in branched chains of up to 20, straight, cylindrical, tapering slightly towards the apex, or obclavate, 18-130 µm long, 8-20 µm wide, pale to dark olivaceous brown, smooth or slightly warted, 1-6 (-11) transverse septa, 0-6 longitudinal or oblique septa (sometimes 2 longitudinal septa in one segment), constricted at septa, basal scar not very obvious; apical cell functions as a secondary conidiophore and usually bears a conidial scar.
More Information
Specimen Contact
Eric McKenzie
Author
McKenzie, E.
Created
05/07/2013 07:15 AEST
Last Updated
18/07/2013 12:02 AEST
Citation
McKenzie, E. (2013) Alternaria brassicicola (Alternaria brassicicola) Updated on 7/18/2013 12:02:57 PM Available online: PaDIL - http://www.padil.gov.au.
Image Use
Free for use under the Creative Commons Attribution 3.0 Australia License

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