Cucumber Cucurbit Scab
A cucumber with gummosis
Scientific Classification
Kingdom: Fungi
Phylum: Ascomycota
Class: Dothideomycetes
Subclass: Dothideomycetidae
Order: Capnodiales
Family: Mycosphaerellaceae
Genus: Cladosporium
Species: Cladosporium cucumerinum
Cladosporium cucumeris A.B. Frank

Cladosporium scabies Cooke
Macrosporium melophthorum (Prill. & Delacr.) Rostr., Gartner-Tidende 24: 189 (1893)

Scolicotrichum melophthorum Prill. & Delacr., Bull. Soc. mycol. Fr. 7(1): 219 (1891)

Gummosis or scab (Cladosporium cucumerinum) is a serious disease of greenhouse cucumbers grown under wet and cool conditions.[1] It can also affect other cucurbits.


Infected fruits develop sunken spots through which oozes an amber-like gum. A dark mould develops on the surface of the gum.[1]


Destroy all diseased fruit. Raise the temperature and reduce humidity.[1]


Maintain a warm, well ventilated environment for growing.[1]



  1. a b c d Hessayon, D.G. (2009). The Vegetable & Herb Expert. Transworld Publishers, London. p. 55. ISBN 9780903505468

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