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Mycologia, DEUTEROMYCOTINA, HYPHOMYCETALES, DEMATIACEAE .

Crops attacked: Cucurbits .

Scab

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

[R]Description
Downy sunken spots with an olivaceous center on the stems and the fruits. Pale spots turning greyish on the leaves.
On melon : the spots are circled by lignified cells.
On marrow pupkin : a gummy exudate is released by the fruit lesions.

[R]Biology
The pathogen survives on crop debris and is dispersed by the wind.
The fungus penetrates the cuticle directly and grows intercellularly through the epidermal and palisade cell layers.
The mycelium grows and colonizes the whole host tissue.

[R]Epidemiology
The optimum temperature is 18 °C. with cold nights accelerating the symptoms.

[R]Treatement
Use fungicide sprays.
Use resistant cultivars.

[R]Possible misleading
.

[R] Images

1. Cladosporium cucumerinum , Scab (BOUHOT D., INRA)
   Cucurbit scab Cladosporium down on cucurbitaceae leaves.
   
2. Cladosporium cucumerinum , Scab (BOUHOT D., INRA)
   Cucurbit scab Spots of cladosporium disease on a melon leaf.
   
3. Cladosporium cucumerinum , Scab (BOUHOT D., INRA)
   Cucurbit scab Protuberant spots of cladosporium disease on melon.
   
4. Cladosporium cucumerinum , Scab (VEGH I., INRA)
   Cucurbit scab Hollow and irregular spots of cladosporium disease on marrow pumpkin.
   

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

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