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Peronospora farinosa Fr. f. sp. spinaciae Byford
Peronospora spinaciae Laubert


Crops attacked: spinach .

[R]Common Names :

Downy mildew

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


In autumn, pale, round (1 - 2 cm diameter) spots occur on the upper surface of the leaves.
The lower surface is covered by a purplish-white down.
On the older leaves yellow lesions occur.
The infected plants are unmarketable, their taste is altered even when used as canned food.

The fungus survives as oospores in the soil or as mycelium in the seeds. The infected plants produce sporangia on their lower surface which can infect other neighbouring plants.

The disease mainly develops in mild, humid (dew) conditions, in young plants.
Sporulation and germination of sporangia occur between 9 and 12 C. Seedlings are easily infected ; adult plants are susceptible to infection on the growing point if free water is present for at least 6 hours.

Ensure minimum crop rotation every three years.
Drain the soil.
Use resistant cultivars.

[R]Possible misleading

[R] Images

  1. Peronospora spinaciae , Spinach downy mildew (ROUXEL F., INRA)
    Spinach downy mildew Spots of downy mildew on leaves of spinach.
  2. Peronospora spinaciae , Spinach downy mildew (BASF)
    Spinach downy mildew Downy cover of downy mildew on the leaves of spinach.

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

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