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Colletotrichum acutatum

Scientific Name
Colletotrichum acutatum
Scientific Author
J.H. Simmonds ex J.H. Simmonds
Taxonomy
(Ascomycota: Sordariomycetes: Glomerellaceae)
Pest Status
1 NZ - Non-regulated species
Status
0 NZ - Unknown
Reliability
High
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Diagnostic Images

Fungal Colony
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Caption
Colletotrichum acutatum 10-day old cultures on PDA, top surface
Source
E. McKenzie Landcare Research
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Diagnostic Images (6)
Diagnostic Notes
Disease

Fruit rot. Traditionally, C. acutatum is widely known as a fruit rot pathogen, although it also occurs on flowers and leaves causing blossom blight, leaf spots, etc. On chilli –causing circular or angular, dark, sunken lesions on fruit, with concentric rings of acervuli that are often wet and produce pink to orange conidial masses, lesions may coalesce. The disease may also occur on leaves and stems.

Morphology

Conidiomata acervuli, producing conidia in a slimy orange-pink matrix. Usually does not produce setae. Conidia 8–22.5 × 2.5–5.5 µm, aseptate, smooth-walled, hyaline, straight, cylindrical with one or both ends pointed.

Note

Molecular techniques have enabled C. acutatum to be separated from C. gloeosporioides and to distinguish the species from other closely related species such as C. fioriniae and C. simmondsii.

It is worth noting that in a molecular study, acutatum-like isolates of Colletotrichum from Australian mango proved to belong to three species, C. acutatum, C. fioriniae and C. simmondsii (Shivas & Tan 2009).

In a molecular study, chilli anthracnose in Thailand was found to be caused by three species Colletotrichum acutatum, C. capsici and C. gloeosporioides (Than et al. 2008), and the same three species have been recorded on capsicum in the Pacific.

More Information
Specimen Contact
Eric McKenzie
Author
McKenzie, E.
Created
12/07/2013 10:21 AEST
Last Updated
21/03/2014 01:11 AEST
Citation
McKenzie, E. (2013) Colletotrichum acutatum (Colletotrichum acutatum) Updated on 3/21/2014 1:11:19 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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