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Panama disease of banana

Scientific Name
Fusarium oxysporum f.sp. cubense
Scientific Author
(E.F. Sm.) W.C. Snyder & H.N. Hansen
Taxonomy
Anamorphic fungi (Ascomycetes)

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Diagnostic Notes

Symptoms:

 

External symptoms including yellowing or collapse of the older leaves, occur on plants more than 4 months old. Sometimes the base of the pseudostem splits. Reddish to dark brown vascular discoloration occurs in the outer leaf sheaths, pseudostem, rhizome and fruit stalk. However fruits do not show symptoms. Usually all leaves collapse and the plant dies (Stover 1972). Other disorders on banana have similar symptoms to those of Panama disease (Beer et al. 2001, Kangire & Rutherford 2001). Fusarium wilt does not cause wilting and blackening of young suckers nor a dry rot in fruit as can be found in moko disease and blood disease.

 

The fungus:

 

Fusarium oxysporum Schltdl. emend. W.C. Snyder & H.N. Hansen is a common soil inhabitant and produces three types of hyaline asexual spores: a) Macroconidia are usually 3-septate, straight to slightly curved, relatively slender and thin-walled, with a foot-shaped to pointed basal cell and a tapered and curved, sometimes with a slight hook, apical cell. They are produced abundantly on pale orange sporodochia and occasionally from hyphae growing on the agar surface. In some isolates, sporodochia may be sparse or non-existent; b) Microconidia are usually unicellular, oval, elliptical or kidney-shaped, produced in false heads, on short monophialides. They are abundant in the aerial mycelia; c) Chlamydospores are formed abundantly and quickly (2-4 weeks on carnation leaf agar) by most isolates, smooth or rough walled, usually formed singly or in pairs, but also may be found in clusters or in short chains. They may be either terminal or i

More Information
Specimen Contact
Dr Jose R. Liberato
Author
Liberato JR, Gasparotto L, Henderson J, Smith LJ, Daly AM & Shivas R
Created
31/05/2006 02:47 AEST
Last Updated
21/10/2011 09:31 AEST
Citation
Liberato JR, Gasparotto L, Henderson J, Smith LJ, Daly AM & Shivas R (2006) Panama disease of banana (Fusarium oxysporum f.sp. cubense ) Updated on 10/21/2011 9:31:26 AM 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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