Stem rot
Tomato stem rot didymella
A tomato stem showing stem rot
Scientific Classification
Kingdom: Fungi
Phylum: Ascomycota
Class: Dothideomycetes
Subclass: Pleosporomycetidae
Order: Pleosporales
Family: Incertae sedis
Genus: Didymella
Species: Didymella lyperscopi
Didymella stem rot

Ascochyta lycopersici Brunaud, (1887)
Diplodina lycopersici Hollós, (1907)
Phoma lycopersici (Plowr.) Jacz., (1898)

Sphaeronaema lycopersici Plowr.,(1881)

Stem rot is a disease caused by Didymella lyperscopi, a fungal plant pathogen which attacks mature tomato 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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