Fitopatologia Brasileira (2003) 28, 49-53
Andréia M.R. Oliveira, Valmir Duarte, José R.P. Silveira and Marcelo G. Moraes (2003)
Incidence of pectolytic erwinias associated with blackleg of potato in Rio Grande do Sul
[Incidence of pectolytic erwinias associated with blackleg of potato in Rio Grande do Sul]
Fitopatologia Brasileira 28 (1), 49-53
Abstract: Erwinia carotovora subsp. atroseptica (Eca), E. carotovora subsp. carotovora (Ecc) and E. chrysanthemi (Ech) may cause potato (Solanum tuberosum) blackleg. To determine the occurrence of these pathogens in the conditions found in the State of Rio Grande do Sul (RS), potato plants showing blackleg symptoms were harvested from 22 fields in nine counties in Serra do Nordeste, Planalto, Depressão Central, and Grandes Lagoas, from September to December of 1999 (Spring-Summer season). Green pepper (Capsicum annuum) fruits were used as a host to enrich for pectolytic erwinia from potato stems with blackleg symptoms. Bacteria were subsequently isolated on non-selective medium. Isolates that were Gram-negative, facultatively anaerobic, and pitted crystal-violet-pectate medium were tested for biochemical traits to identify the species and subspecies. Four hundred strains were identified as either Eca, Ecc or Ech. Although the three erwinias were found in RS potato fields, only three strains of Ech were found in one field. Frequencies of Eca and Ecc were 55 and 42%, respectively. Eight strains could not be assigned based on the biochemical characterization.
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(original language: Portuguese)
Full text of article
Research topic(s) for pests/diseases/weeds:
surveys/sampling/distribution
Pest and/or beneficial records:
| Beneficial | Pest/Disease/Weed | Crop/Product | Country | Quarant.
|
|---|---|---|---|---|
| Pectobacterium carotovorum | Potato (Solanum tuberosum) | Brazil (south) | ||
| Pectobacterium atrosepticum | Potato (Solanum tuberosum) | Brazil (south) | ||
| Dickeya (genus) | Potato (Solanum tuberosum) | Brazil (south) |
