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Sclerotium cepivorum Berk
Stromatinia cepivorum Berk

Mycologia, FUNGI IMPERFECTI, AGONOMYCETALES .

Crops attacked: shallots, .


[R]Common Names :

White rot

World wide distribution. In certains conditions there can be complete destruction, particularly in cool climate.

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


[R]Identification
Sclerotia and the mycelium are visible with a naked eye.
The fungus can be isolated and cultured on growth medium.

[R]Description
Serious and frequent.
Damping-off.
White cotony mycelium at the base of the bulbs and on the roots ; formation of little black spheric sclerotia in large numbers (0.2 - 0.5 mm diameter).

[R]Biology
The primary sites of infection are due to mycelial hyphae produced by sclerotia under the action of specific agents generated by the roots of the host plants.
Secondary infection from plant to plant may occur such as the intensive infection in onions.
Yellowing and wilting of the older leaves which fall.
The fungus persists during winter burried in the soil as sclerotia.

[R]Epidemiology
Long survival (15 years) of sclerotia in the soil.
Optimum temperature : 10 -20 C.
The growth of this fungus is restricted by higher temperatures.

[R]Treatement
Avoid the too frequent return of crops of the Allium family in the rotation.
Seed control.

[R]Possible misleading
.

[R] Images

  1. Sclerotium cepivorum , White rot (VEGH I., INRA)
    White rot on shallot Bulb of shallot rotten by Sclerotium cepivorum .

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