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Alternaria brassicae

Scientific Name
Alternaria brassicae
Scientific Author
(Berk.) Sacc.
Taxonomy
(Ascomycota: Dothideomycetes: Pleosporales: Pleosporaceae)
Pest Status
1 NZ - Non-regulated species
Status
NZ - Exotic
Reliability
High
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Diagnostic Images (5)
Diagnostic Notes
Disease

Grey leaf spot, stalk and fruit spot. Leaf spots begin as small black dots, enlarging as circular to irregular, zonate lesions, up to 1 cm diam., grey or pale brown. Similar spots on fruit (siliqua) and oval spots on stalks. May cause damping-off when infected seed is sown.

Morphology

Conidiophores arising in groups of 2–10, pale greyish olive, up to 170 µm long, 6–11 µm thick, with one or more distinct conidial scars. Conidia single or occasionally in chains of up to 4, straight or slightly curved, obclavate, rostrate, 75–350 µm long (including rostrum), 20–30(–40) µm wide, pale or greyish olive, smooth or inconspicuously warted, (6–)11–15(–19) transverse septa, 0–8 longitudinal or oblique septa (sometimes 2 longitudinal septa in one segment), constricted at septa, basal scar obvious; beak is about ? to ½ length of conidium, unbranched, pale coloured, 5–9 µm thick, cylindrical.

More Information
Specimen Contact
Eric McKenzie
Author
McKenzie, E.
Created
11/07/2013 08:03 AEST
Last Updated
07/05/2014 03:30 AEST
Citation
McKenzie, E. (2013) Alternaria brassicae (Alternaria brassicae) Updated on 5/7/2014 3:30:29 AM 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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