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Erysiphe betae (Vanha) Weltzien

Mycologia, ASCOMYCOTINA, ERYSIPHALES, ERYSIPHACEAE .

Crops attacked: beet .


[R]Common Names :

Powdery mildew

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


[R]Identification
Strict obligate parasite.

[R]Description
White thin powdery mycelial lesions appear on the leaves in summer.
Yield loss caused by the reduction of chlorophil assimilation.
Drop of yield and quality of the seed crops.

[R]Biology
Conidia form on external mycelium (powdery mildew aspect) and spread the parasite.
Perithecia (granulations) occur at an advanced stage of the disease and preserve the fungus through unfavourable conditions.

[R]Epidemiology
The disease occurs in some isolated hosts, then extends to the totality of the field.
An optimum temperature of 20 C. is necessary for mycelial development.
For conidial formation alternate humid and dry conditions are required.
Conidia are wind-borne.

[R]Treatement
.

[R]Possible misleading
.

[R] Images

  1. Erysiphe betae , Beet powdery mildew (INRA)
    Beet powdery mildew White down on the upper face of a beet leaf.
  2. Erysiphe betae , Beet powdery mildew (INRA)
    Beet powdery mildew Abondant powdery cover on a seed-carrier of beet.
  3. Erysiphe betae , Beet powdery mildew (BASF)
    Beet powdery mildew Downiness due to Erysiphe betae on the upper surface of a beet leaf.

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