Methods for assessing the susceptibility of carrot roots to soft rot caused by Erwinia carotovora
1989
Michalik, B. (Agriculture Univ., Krakow (Poland). Dept. of Horticulture) | Gabelman, W.H. | Simon, P.W.
The susceptibility of different carrot lines and cultivars to soft rot was assessed by comparing 5 methods of inoculation, 4 pathogen concentrations and 4 strains of Erwinia carotovora. There were differences between strains with most severe damage by Erwinia carotovora pv carotovora SR 394 and Erwinia carotovora pv atroseptica SR 159. Between methods, inoculation on root slices with soaked paper disc produced the most consistent response. The severity of disease damage was proportional to bacterial suspension concentration. Postharvest storage of roots in cold room (4 degrees C) for 12 weeks had no effect upon severity of bacterial soft rot. Also only small differences were observed connected with postharvest root cutting. Intact and cut roots had a similar disease response during storage, but the tip portion of the root was slightly more susceptible to soft rot than was the crown portion. The differences between carrot lines and cultivars tested suggested that by using a proposed method for screening, it would be possible to select carrots with reduced susceptibility to soft rot for breeding.
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