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Mycologia, ASCOMYCOTINA, ERYSIPHALES, ERYSIPHACEAE .

Crops attacked: beet .

Powdery mildew

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

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

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