Gummy stem blight
Cucumber Stem Rot Leaf
A cucumber showing the later stages of gummy stem blight caused by the anamorph Phoma cucurbitacearum
Scientific Classification
Kingdom: Fungi
Phylum: Ascomycota
Class: Dothideomycetes
Subclass: Pleosporomycetidae
Order: Pleosporales
Family: Incertae sedis
Genus: Didymella
Species: Didymella bryoniae
Gummy stem blight

Vine decline
Ascochyta citrullina (Chester) C.O. Sm., (1905)
Ascochyta cucumis Fautrey & Roum., (1891)
Ascochyta melonis Potebnia, (1910)
Cercospora citrullina Cooke, (1883)
Cercospora cucurbitae Ellis & Everh., (1888)
Didymella effusa (Niessl) Sacc., (1882)
Didymella melonis Pass., (1891)
Didymosphaeria bryoniae (Auersw.) Niessl, (1875)
Didymosphaeria effusa Niessl
Didymosphaeria melonis Pidopl.
Diplodina citrullina (Chester) Grossenb., (1909)
Mycosphaerella citrullina (C.O. Sm.) Grossenb., (1909)
Mycosphaerella cucumis (Fautrey & Roum.) W.F. Chiu & J.C. Walker, (1949)
Mycosphaerella melonis (Pass.) W.F. Chiu & J.C. Walker, (1949)
Phyllosticta citrullina Chester, (1891)
Sphaerella bryoniae Auersw., 5: 15 (1869)
Sphaerella citrullina (C.O. Sm.) Sacc. & Traverso, (1911)

Sphaeria bryoniae Fuckel, (1870)

Gummy stem blight is a disease of Cucurbits cause by two members of the Pleosporales order; Didymella bryoniae and Phoma cucurbitacearum, fungal plant pathogens, which attack mature plants.[1]


Lower leaves turn yellow and a sunken brown canker appears at the base of the stem. Black dots develop in the cankered area. Disease may spread to other parts of the stem.[1]


Lift and destroy badly affected plants.

If the plant is only partially affected; cut out the diseased area.


Fungicidal sprays are no longer available for treating this disease.


Sterilise greenhouse and equipment between crops.[1]



  1. a b c Hessayon. D.G. (2009). The Vegetable & Herb Expert. Transworld Publishers, London. p 103. ISBN 9780903505468.
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