Pectobacterium carotovorum
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Author(s): Paul Bachi, University of Kentucky Research and Education Center
Source: IPM Images
Pectobacterium carotovorum (Jones 1901) Waldee 1945
The bacterium causes important soft rot diseases on many plants (bacterial soft rot) and has a worldwide distribution. Crops affected are, among others, potatoes, carrots, as well as vegetables like onions, Brassica crops or tomatoes. P. carotovorum is the type species of the genus Pectobacterium.
Members of this genus produce pectolytic enzymes which distinguish them from the genus Erwinia. These break down the structural substance pectin in the cell walls, leading to cell death and decay of the tissue. The bacterium is Gram-negative, rod-shaped and motile with a size of 1½-2 x 0.5-0.7 µm. Soft rot diseases develop fast, usually within 2-3 days after inoculation. The symptoms are water-soaked lesions and rapid maceration of the plant tissue. Effective bactericides are currently not available and control through resistant varieties is the common approach.
| Vernacular names | |
|---|---|
| • Deutsch: | Bakteriennaßfäule des Gemüses |
| • English: | bacterial soft rot |
| • Español: | podredumbre blanda bacteriana |
| • Français: | pourriture molle de l'endive pourriture bactérienne des racines de l'artichaut |
The strains classified previously as Erwinia carotovora subsp. atroseptica which cause potato backleg and tuber soft rot have been assigned to the related species Pectobacterium atrosepticum.
Pectobacterium carotovorum subsp. carotovorum and other species of Pectobacterium also infect potato. For example, Pectobacterium brasiliense (previously Pectobacterium carotovorum subsp. brasiliense) causes another important soft rot disease of potato.
Synonyms:
Erwinia carotovora
- Other images of Pectobacterium carotovorum (IPM Images - click to enlarge)
symptoms on onion
symptoms on onion
causing black leg symptoms on tobacco
