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Post Harvest Diseases:: Vegetables:: Carrot

Cottony soft rot / white mould: Sclerotinia sclerotiarum
Symptom:
  • Foliage  - water soaked, dark olive-green lesions associated with collapsed tissues 
  • Lesions expand rapidly over the entire leaf, petiole, and rosette with infected tissues
  • Covered by abundant cottony, white mycelium
  • At an advanced stage - affected tissues exhibit a bleached appearance, and occasionally an entire plant may collapse 
  • Large black sclerotia (2 to 20mm) form externally embedded in the mycelium or internally, within the pith of the petiole
infected tissue Cottony white mycelium Severly affected carrots infected carrots
Identification of pathogen:
  • Source of inoculum - soil - sclerotia, mycelium or ascospores of fungus occu
  • Temp - 12.9 to 18.5°C
Management:
  • Storage - Good ventilation
  • Use of clean containers, maintenance of temp near 0°C
Source of Images:
 http://www.gov.mb.ca/agriculture/crops/plant-diseases/print,sclerotinia-carrots.html
http://pnwhandbooks.org/plantdisease/carrot-daucus-carota-cottony-rot
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