Pink root of onion

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Pink root of onion
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An onion bulb showing typical symptoms of P. terrestris
Scientific Classification
Kingdom: Fungi
Phylum: Ascomycota
Class: Dothideomycetes
Subclass: Pleosporomycetidae
Order: Pleosporales
Family: Incertae sedis
Genus: Phoma
Species: Phoma terrestris
Phoma terrestris H.N. Hansen, (1929)

Pink root of onion (Phoma terrestris) s a disease of onions that can cause symptoms very similar to nutrient deficiencies or stress associated with extremely dry conditions.[1]

Symptoms[edit | edit source]

Severely infected plants appear to have a nutrient deficiency or water stress. Roots will range in color from light to deep pink. Can cause roots to become desiccated and shrivel up. Bulbs will be stunted.[2]

Prevention[edit | edit source]

Good management practices that reduce plant stress will also reduce the impact of pink rot on yields. Growers should consider an integrated approach for managing this disease in future onion crops and infested fields. Studies have shown that a three to five year crop rotation with a non-host crop can significantly reduce the soil borne pathogen population levels of P. terrestris but will not eliminate it from soil. Resistant cultivars have been developed and should be planted in fields that have high soil population levels of the pathogen. Many of the early Japanese varieties appear to be very susceptible to this disease and should be avoided in heavily infested fields. Soil fumigation can also be used to reduce soil population levels.[1]

Gallery[edit | edit source]

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Error creating thumbnail: Unable to save thumbnail to destination

See Also[edit | edit source]

References[edit | edit source]


  1. a b Celetti, M. (2005). Pink Root of Onions. Ontario Ministry of Agriculture, Food and Rural Affairs. Retrieved: 2010-08-03.
  2. Langston, D.B. (2006). Pink root of onion. Forestry images. Image Number: 5077074. Retrieved: 2010-08-04.