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Cercospora apii

Scientific Name
Cercospora apii
Scientific Author
Fresen.
Taxonomy
(Ascomycota: Dothideomycetes: Capnodiales: Mycosphaerellaceae)
Pest Status
1 NZ - Non-regulated species
Status
NZ - Exotic
Reliability
High
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Diagnostic Images

In Life
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Caption
Cercospora apii leaf spot on celery (Apium graveolens)
Source
E. McKenzie Landcare Research
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Diagnostic Images (6)
Diagnostic Notes
Disease

Leaf spot. On celery leaf spots round to irregular, sometimes limited by veins, pale to dark brown, often with darker margin, sometimes coalescing to form large blotches.

Morphology

Conidiophores usually arising from brown stromata on lower surface of leaf, in groups of up to 30, olivaceous-brown, usually 20–350 µm long but sometimes much longer especially if plant material has been kept in high humidity, 3–6 µm thick. As conidiophores continue to elongate they produce successive conidia, and hence two or more widely spaced scars. Conidia 30–200 µm long but sometimes longer especially if plant material has been kept in high humidity, 2–5 µm wide, hyaline, 3–25-septate, smooth, acicular, straight or curved, tip rounded, basal cell truncate with a distinct dark scar. On young lesions or under dry conditions the conidia may be smaller and obclavate in shape; the first cell may also taper towards a somewhat rounded base (with dark scar).

More Information
Specimen Contact
Eric McKenzie
Author
McKenzie, E.
Created
11/07/2013 01:00 AEST
Last Updated
20/03/2014 19:34 AEST
Citation
McKenzie, E. (2013) Cercospora apii (Cercospora apii) Updated on 3/20/2014 7:34:22 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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