Mycologia, ASCOMYCOTINA, ERYSIPHALES, ERYSIPHACEAE .
Identification, Description, Biology, Epidemiology, Treatement, Possible misleading, Images
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.
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.
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.
HYP3 on line : Species (scientific name), Diseases (common names), Glossary, Crops.