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Choanephora cucurbitarum

Scientific Name
Choanephora cucurbitarum
Scientific Author
(Berk. & Ravenel) Thaxt.
Taxonomy
(Zygomycota: Mucoromycotina: Mucorales: Choanephoraceae)
Pest Status
2 NZ - Regulated pest
Status
0 NZ - Unknown
Reliability
High
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Diagnostic Images

Sporangia
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Caption
Choanephora cucurbitarum sporangia
Source
E. McKenzie Landcare Research
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Diagnostic Images (13)
Diagnostic Notes
Disease

Blossom blight and fruit rot. Dense white fungal growth visible on infected flowers and fruits, with dark brown ‘pin-heads’ when the fungus starts to produce spores. Can invade damaged tissues causing water-soaked leaf spots and, on cucurbits, a soft fruit rot. Especially common under wet, warm conditions.

Morphology

Colonies fast growing with abundant mycelium, white, becoming pale yellow. Sporangiophores 1–10 mm tall, 6–12 µm thick, non-septate, unbranched, hyaline, giving rise to up to 12 apical swellings (vesicles) at the top of the sporangiophore. Sporangia arise on short stalks from the apical vesicles at the top of the sporangiophores. The sporangia each contain a single spore but the spores do not readily separate from the sporangium wall and thus remain within the sporangia. In effect, the sporangia appear to be the spores (sporangiospores). The sporangia (‘spores’) are broadly fusiform or ellipsoid, (8–)12–20(–30) µm long, (5–)6–12(–18) µm wide, brown or reddish brown to pale brown, more or less distinctly longitudinally striate, subtended by a short, cylindrical pedicel.

More Information
Specimen Contact
Eric McKenzie
Author
McKenzie, E.
Created
12/07/2013 09:24 AEST
Last Updated
20/03/2014 20:12 AEST
Citation
McKenzie, E. (2013) Choanephora cucurbitarum (Choanephora cucurbitarum) Updated on 3/20/2014 8:12:28 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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