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Mycologia, ASCOMYCOTINA, HELOTIALES, SCLEROTINIACEAE .

Crops attacked: strawberry .

Grey mould

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

[R]Description
The disease affects the fruits : they rotten, turn yellow or brown depending on their stage of development, then are covered by grey downy soft rot.

[R]Biology
The conidia of this fungus are spread all over in nature and infect plants at blossom : the stamens or whatever parts of the withered contaminated corollas are left contaminate the budding fruit through direct contact.

[R]Epidemiology
Conidial germination is possible even without free water if the RH is over 90%. High humidity favours the spread of the epidemics while temperature is relatively unimportant.

[R]Treatement
Apply a locally reccommended fungicide during the advised stage.
Use protective plastic sheets to isolate the fruits from the wet soil.
In the glasshouse, ventilate and don't use water spraying.

[R]Possible misleading
.

[R] Images

1. Botrytis cinerea , Grey mould (GRISP-INRA)
   Grey mould on strawberry Leaving petal on a strawberry calyx infecting the berry with grey mould.
   
2. Botrytis cinerea , Grey mould (GRISP-INRA)
   Grey mould on strawberry Epidemic of grey mould on strawberry (infection by contact).
   

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