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Alternaria dauci

Scientific Name
Alternaria dauci
Scientific Author
(J.G. Kühn) J.W. Groves & Skolko
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 dauci conidia
Source
E. McKenzie Landcare Research
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Diagnostic Images (6)
Diagnostic Notes
Disease

Leaf blight. Irregular, dark brown blotches on leaves and petioles. All above ground parts of the plant may be killed progressively from the outer leaves inwards, with a reduction in root development.

Morphology

Conidiophores arising singly or in small groups, pale to brown, up to 80 µm long, 6–10 µm thick, usually unbranched, with one or more distinct conidial scars. Conidia usually solitary, occasionally in chains of 2, straight or curved, obclavate, rostrate, 100–450 µm long (including rostrum), 16–25 µm wide, pale olivaceous brown to brown with age, smooth, 7–11 transverse septa, 1 to several longitudinal or oblique septa, constricted at septa, basal scar not very obvious; beak is often longer than body of conidium, unbranched or branched once, hyaline or pale coloured, 5–7 µm thick at base, tapering to 1–3 µm near apex.

More Information
Specimen Contact
Eric McKenzie
Author
McKenzie, E.
Created
11/07/2013 08:30 AEST
Last Updated
07/05/2014 03:33 AEST
Citation
McKenzie, E. (2013) Alternaria dauci (Alternaria dauci) Updated on 5/7/2014 3:33:35 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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