Plant Pathology (2013) 62, 578-586

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G. Sharabani, S. Manulis-Sasson, M. Borenstein, R. Shulhani, M. Lofthouse, L. Chalupowicz and D. Shtienberg (2013)
The significance of guttation in the secondary spread of Clavibacter michiganensis subsp. michiganensis in tomato greenhouses
Plant Pathology 62 (3), 578-586
Abstract: Bacterial canker, caused by Clavibacter michiganensis subsp. michiganensis (Cmm), can spread in commercial tomato greenhouses causing epidemics. Results of greenhouse experiments with Cmm-contaminated tools demonstrated disease spread for only a limited distance (<4 plants) from infected plants. However, touching symptomless infected plants bearing guttation droplets prior to touching nearby plants spread the pathogen over longer distances within rows (>22 plants). The pathogen was exuded in large numbers in the guttation fluid of infected plants; its presence in the guttation fluid was not influenced by the inoculation procedures, leaf age or the volume of the guttation droplets. Population size of Cmm and the incidence of leaflets with epiphytic bacteria were significantly higher in plants placed in a guttation-induction chamber than in those kept in a growth chamber with high humidity, suggesting exudation through guttation contributed to the formation of epiphytic populations on leaflets. This new knowledge may provide a simple and environmentally friendly means for decreasing the spread of the disease by avoiding contact with plants during periods when they bear guttation droplets.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): D. Shtienberg, Shulamit Manulis-Sasson

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology
transmission/dispersal of plant diseases

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Clavibacter michiganensis Tomato (Solanum lycopersicum)