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Athelia rolfsii (Curzi) Tu et Kimbrough
Corticium rolfsii Curzi

Mycologia, BASIDIOMYCOTINA, APHYLLOPHORALES, CORTICIACEAE .

Crops attacked: artichoke .

[R]Common Names :

Collar rot

This disease is found in all artichoke producing countries.

Identification, Description, Biology, Epidemiology, Treatement, Possible misleading, Images

[R]Identification
The sclerotia and mycelium are visible to the naked eye.
The fungus can be isolated and grown on culture media.

[R]Description
The symptoms are the same as those caused by Sclerotinia sclerotiorum .
A white mycelium with concentric growth appears on the diseased parts of the plant.
Numerous dark, globular (2-3mm in diameter) sclerotia form in these regions, often in groups.

[R]Biology
The fungus can remain viable in the soil as mycelium, living as saprophytes on diverse organic material, or as sclerotia which may remain viable for many years.
Under favourable conditions, the sclerotia regain their activity forming mycelium which penetrate directly into the tender non-woody tissues.

[R]Epidemiology
Elevated temperatures (25 to 30oC) and high relative humidity (80%) favour outbreaks of this disease. They most commonly occur in regions with light soils.

[R]Treatement
See the information concerning "collar rot" caused by Sclerotinia sclerotiorum .

[R]Possible misleading
Possible confusion with collar rot due to Sclerotinia sclerotiorum and Rhizoctonia solani , which often coexist.

[R] Images

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HYP3 on line : Species (scientific name), Diseases (common names), Glossary, Crops.

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