Bacterial blight of carrot
Carrot Bacterial streak Xanthomonas campestris pv. carotae
Scientific Classification
Kingdom: Bacteria
Phylum: Proteobacteria
Class: Gamma Proteobacteria
Order: Xanthomonadales
Family: Xanthomonadaceae
Genus: Xanthomonas
Species: Xanthomonas hortorum pv. carotae
Bacterial blight of carrot

Bacterial leaf blight of carrot
Carrot leaf blight (bacterial)
Maladie bactérienne de la carotte (French)
Quemadura bacteriana de la zanahoria (Spanish)
Root scab of carrot
Bacterium carotae (Kendrick) Burgwitz
Phytomonas carotae Kendrick
Pseudomonas carotae Kendrick
Xanthomonas campestris pv. carotae (Kendrick) Dye

Xanthomonas carotae (Kendrick) Dowson


Initially appear as small yellow angular spots that expand to irregular dark brown water-soaked lesions on leaves, stems and petioles, blight of partial or entire umbels, often surrounded by a yellow halo. Lesions are common at the "V" shaped junction of the leaflet lobes. On flower stalks a gummy bacterial exudate may develop.[1][2]


Appropriate action by growers should be ploughing in of infected foliage debris after harvest and to use a suitable 2-3 year rotation.[3]


Since the bacterium is a common contaminant of carrot seed, the use of pathogen-free seed or hot water-treated seed is necessary. Copper-based bactericides can slow development of leaf blight in the field.[2]



  1. Ming Wu, B.; Simmons, R.; Johnson, K.B. and Du Toit, L.J. Evaluation of systemic acquired resistance for suppression of Xanthomonas hortorum pv. carotaein carrot seed crops. Central Oregon Agricultural Research Center.
  2. a b Du Toit, L. and Inglis, D. (2002). WSU Vegetable Pathology Team Newsletter. Pacific Northwest Vegetable Extension Group. Retrieved: 2010-10-21.
  3. (2006). Bacterial blight of carrot (Xanthomonas hortorum pv. carotae). The Food and Environment Research Agency. Retrieved: 2010-10-21.

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