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White mould of bean

Scientific Name
Sclerotinia sclerotiorum
Scientific Author
(Lib.) de Bary
Taxonomy
Ascomycetes, Helotiales
Status
Exotic Species Occurrence in Australia
Reliability
High
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Diagnostic Images

Pathogen
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Caption
Sclerotia of Sclerotinia sclerotiorum (copyright, for use contact [email protected]).
Source
Dr T.J. Paula Jr Epamig
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Diagnostic Images (19)
Diagnostic Notes

Symptoms:

 

The fungus infects stem, pods and leaves, causing a watery rot and covering the infected tissue with a dense white mycelium, where are produced sclerotia. The attack results in death of some branches or of the entire plant (Chambers & Hardie 1960).

 

The pathogen:

 

Kohn (1979) has detailed described this fungus. A brief summary of his description is given here: S. sclerotiorum produces sclerotia variable in shape, on dense, white mycelium, measuring 2—30 x 2—15 mm, with black outer rind and white inner context. The sclerotia give rise to several apothecia with receptacle 2—10 mm broad and stipe 3—30 mm long, 1—2 mm wide. Ectal excipulum 35—140 µm wide. Asci arising from croziers, 8–spored, cylindrical, 110—160 x 6—10 µm, with a thickened apex. Ascospores hyaline, ellipsoid, biguttulate, 9—14 x 4—6 µm, length/width ratio usually greater than 2.0. Paraphyses hyaline, filiform, 2 µm wide, septate, simple or sparsely branched. The fungus produces globose, hyaline microconidia (Myrioconium), 2—4 µm in diameter, on phialides.

 

Note: The synonyms of S. sclerotiorum given here are according to Kohn (1979).

 

More Information
Specimen Contact
Dr Jose R. Liberato
Author
Liberato JR, Paula Júnior TJ, Lobo Junior M & Sartorato A
Created
13/07/2006 04:33 AEST
Last Updated
21/02/2007 11:17 AEST
Citation
Liberato JR, Paula Júnior TJ, Lobo Junior M & Sartorato A (2006) White mould of bean (Sclerotinia sclerotiorum) Updated on 2/21/2007 11:17:36 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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