Phytoparasitica (2003) 31, 174-187

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H. Shwartz, D. Shtienberg, H. Vintal and G. Kritzman (2003)
The interacting effects of temperature, duration of wetness and inoculum size on the infection of pear blossoms by Erwinia amylovora, the causal agent of fire blight
Phytoparasitica 31 (2), 174-187
Abstract: Pear blossoms are the plant tissue that is most vulnerable to infection by Erwinia amylovora (Burrill) Winslow et al., the causal agent of fire blight. The interacting effects of temperature, wetness duration and inoculum size on the development of fire blight symptoms in detached pear blossoms were determined in three sets of experiments conducted under controlled conditions. It was expected that this information would facilitate the improvement of a warning system used in fire blight management. Results of the ANOVA tests of the data revealed highly significant interactions among the factors tested. The factors that contributed most to disease incidence were temperature and inoculum size; effects of wetness duration were significant in some cases, but that effect was small. It was further demonstrated that the effects of the interaction of these factors on the incidence of blossom infection may be understood in terms of the general concept of compensation. According to this concept, conditions highly favorable for one of the factors essential for pathogen development may compensate for other factors, for which the conditions are less favorable. As a result of the complex interactions observed between the biotic and abiotic factors, because of compensation relationships and because some of the factors cannot be estimated adequately (for example, inoculum level), it was concluded that it is not yet possible to improve fire blight management by using data on the quantitative relationships between biotic and abiotic factors.
(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

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation
population dynamics/ epidemiology


Pest and/or beneficial records:

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


Erwinia amylovora Pear (Pyrus)