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Asperisporium Black Spot of Papaya

Scientific Name
Asperisporium caricae
Scientific Author
(Speg.) Maubl
Taxonomy
(Anamorphic fungi - Ascomycetes)
Status
Exotic Species Occurrence in Australia
Reliability
High
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Diagnostic Notes
The fungus: Sporodochia hypophyllous, dark blackish brown to black. Stroma well-developed, erumpent. Conidiophores closely packed together and covering the surface of the stroma, usually unbranched, hyaline to olivaceous brown, with several prominent conidial scars at the apex, up to 45 x 6–9 µm. Conidia solitary, ellipsoidal, pyriform or clavate, 1-septate, hyaline to mid pale brown, verrucose, 14–26 x 7–10 µm (Maublanc 1913, Ellis 1970, Ellis & Holliday 1972).

Symptoms: Black pustules on the abaxial surface of the leaf are characteristic of this disease. The first symptoms are scattered small spots, visible on both leaf surfaces. On the upper surface, the lesions are rounded or somewhat angular, 1-4 mm in diameter, pale yellow, with dark margins. Later the lesions become necrotic and whitish. On the lower surface, the lesions are covered with masses of fungal spores which appear as dark dots. The pustules can cover the whole lesion (Maublanc, 1913).

The disease is more intense on the lower leaves. Sometimes the leaf lesions can cover an extensive area, causing yellowish and premature drop. The pustules also occur on fruit. The lesions are superficial and do not enter the flesh of the fruit. The damage to fruit is entirely cosmetic.

The black lesions can appear white if hyperparasitized by fungi such as Cephalosporium, Rhinotrichum gossypinum and Verticillium.
More Information
Specimen Contact
Dr Jose Liberato
Author
Liberato JR, McTaggart AR & Shivas RG
Created
30/01/2006 01:11 AEST
Last Updated
09/10/2012 13:38 AEST
Citation
Liberato JR, McTaggart AR & Shivas RG (2006) Asperisporium Black Spot of Papaya (Asperisporium caricae) Updated on 10/9/2012 1:38:34 PM Available online: PaDIL - http://www.padil.gov.au.
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Free for use under the Creative Commons Attribution 3.0 Australia License

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