Bacterial blight of carrot
| Xanthomonas | |
|---|---|
| Bacterial blight of carrot | |
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| Scientific Classification | |
| Kingdom: | Bacteria |
| Phylum: | Proteobacteria |
| Class: | Gamma Proteobacteria |
| Order: | Xanthomonadales |
| Family: | Xanthomonadaceae |
| Genus: | Xanthomonas |
| Species: | Xanthomonas hortorum pv. carotae |
| Synonyms | |
| Bacterial blight of carrot Bacterial leaf blight of carrot |
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Symptoms[edit | edit source]
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]
Treatment[edit | edit source]
Appropriate action by growers should be ploughing in of infected foliage debris after harvest and to use a suitable 2-3 year rotation.[3]
Prevention[edit | edit source]
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]
Examples[edit | edit source]
References[edit | edit source]
- ↑ 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.
- ↑ a b Du Toit, L. and Inglis, D. (2002). WSU Vegetable Pathology Team Newsletter. Pacific Northwest Vegetable Extension Group. Retrieved: 2010-10-21.
- ↑ (2006). Bacterial blight of carrot (Xanthomonas hortorum pv. carotae). The Food and Environment Research Agency. Retrieved: 2010-10-21.
