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Thanatephorus cucumeris (A.B. Frank) Donk x artichoke
Corticium solani (Prill. et Delacr.) Bourdot et Galzin,

Mycologia, BASIDIOMYCOTINA, TULASNELLALES, TULASNELLACEAE .

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
Mycelium and pseudo-sclerotia are visible with the naked eye.
The fungus may be isolated and grown on culture media.

[R]Description
The symptoms are the same as those caused by Sclerotinia sclerotiorum . A clear mould, like a fine spider's web, appears on infected areas. It is initially grayish-white, and later reddish-brown and spotted with globular pseudo-sclerotia, 0.5mm in diameter.

[R]Biology
The fungus may remain viable in the soil either as mycelium living as saprophytes on diverse organic material or as pseudo-sclerotia, which may remain viable for 6 to 7 years.
The sexual form rarely appears.

[R]Epidemiology
The disease is favoured by elevated temperatures (optimal between 25 and 30 °C.) and a somewhat elevated soil humidity.
This fungus prefers compact and argillaceous soil.

[R]Treatement
See the information for "collar rot" due to Sclerotinia sclerotiorum .

[R]Possible misleading
May be confused with collar rot due to Sclerotinia sclerotiorum and Sclerotium rolfsii , which often coexist.

[R] Images

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