Development of Populations of Softrot Bacteria on Witloof Chicory Leaves during Root Production in the Field

Schober, B.M.; Zadoks, J.C.

doi:10.1111/j.1439-0434.1998.tb04765.x

Cited by 4 publications

(1 citation statement)

References 11 publications

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“…That is because it can be produced in the open field as well as in greenhouses in different periods of the year and is thus exposed to many different plant diseases and pests (Barroso et al., 1999; Budge and Whipps, 2001; Gimenez et al., 2002). In this regard there are lesser data on chicory available, although they are steadily increasing from year‐to‐year (Schober and Zadoks, 1998; Bertolini et al., 2003). This coincides with the extension of its production and increasing consumption.…”

Section: Introductionmentioning

confidence: 99%

Efficacy of Three Natural Chemicals to Reduce the Damage of Erysiphe cichoracearum on Chicory in Two Meteorologically Different Growing Seasons

Trdan¹,

Valič²,

Jerman³

et al. 2004

Journal of Phytopathology

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In two meteorologically quite different years, 2002 and 2003, efficacy of three natural substances with a fungicidal activity (sulphur, soya lecithin, salicylic acid) for control of Erysiphe cichoracearum on chicory was tested. In a block designed field experiment, there were statistically significant differences in the mean index of infection of exterior leaves, in the mean total weight and mean net weight of the plants (¼ total weight ) weight of removed damaged leaves). There was also a significant difference in firmness of the heads of nine chicory varieties that was established in both years. In 2002, when no extreme weather conditions occurred, the fungus spread to a substantially larger extent. Yet no statistically significant differences were found in the efficacy of environmentally friendly fungicidal substances for control of the fungus. In the hotter and drier year of 2003, which was less favourable for spread of the pathogen, sulphur-containing fungicide was the most effective. In 2002, chicory yield was lower than in 2003. Generally, yield loss due to removal of damaged leaves was from 30.7 to 45.0% in the first year, and from 11.3 to 24.8% in the second. The highest mean total yield and net yield of chicory were in plants, which were treated three times with sulphur-containing fungicide. In 2002, the most firm heads were in plants treated with sulphur. In 2003, no significant differences among substances were detected. The most infected with the powdery mildew caused by E. cichoracearum, were the less productive varieties of chicory. A statistically significant relationship was not found between the firmness of the heads and the degree of infection. Among different parameters in this experiment, the only relevant and high statistically significant positive correlation (r 2 ¼ 0.71) was determined between the total weight of the plants and yield loss of chicory due to infection with the fungus in question.U. S.

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Section: Introductionmentioning

confidence: 99%

Efficacy of Three Natural Chemicals to Reduce the Damage of Erysiphe cichoracearum on Chicory in Two Meteorologically Different Growing Seasons

Trdan¹,

Valič²,

Jerman³

et al. 2004

Journal of Phytopathology

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A Test of Taxonomic and Biogeographic Predictivity: Resistance to Soft Rot in Wild Relatives of Cultivated Potato

Chung¹,

Holmquist²,

Spooner³

et al. 2011

Phytopathology®

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The concept that traits should be associated with related organisms and that nearby populations of the same species are likely to be more similar to each other than to populations spread far apart has long been accepted. Consequently, taxonomic relationships and biogeographical data are commonly believed to have the power to predict the distribution of disease resistance genes among plant species. In this study, we test claims of such predictivity in a group of widely distributed wild potato species. There was no clear association between resistance to soft rot and taxonomic relationships. However, we have found some associations between resistance to soft rot and environmental data such as annual precipitation and annual mean temperature. In addition, we have noted that high levels of resistance are mostly found in species with high levels of phenotypic plasticity. The three most resistant species were Solanum paucijugum, S. brevicaule, and S. commersonii.

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Survival of Softrot Bacteria during the Storage of Witloof Chicory Roots

Schober

Zadoks

1999

Journal of Phytopathology

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During the cold storage of witloof chicory roots, changes in the populations of the softrot bacteria Erwinia carotovora ssp. carotovora (Ecc), Erwinia carotovora ssp. atroseptica (Eca) and Pseudomonas marginalis (Pm) were investigated from October (directly after harvest) until March of the next year. Colonization incidence of Ecc and Pm changed during the early weeks of storage in each of the 3 years of the experiment and increased significantly after December, approximately 6 to 8 weeks after the roots had been placed in storage. After inoculation, during storage in 1996, populations of Eca decreased continuously from 5.8 × 105 CFU/ml to 103 CFU/ml 4 weeks later in mid‐November without any further statistically significant increase during the rest of the storage period. Timecourse analysis of the monthly colonization incidence of Ecc and Pm over the 3 years revealed that the incidence was significantly dependent on the incidence 2 weeks earlier. Also, high colonization incidences during storage coincided with high disease incidence during the following forcing period of the roots. Therefore, a forecast of disease incidence during forcing of the witloof chicory heads may be envisaged.

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Development of Populations of Softrot Bacteria on Witloof Chicory Leaves during Root Production in the Field

Cited by 4 publications

References 11 publications

Efficacy of Three Natural Chemicals to Reduce the Damage of Erysiphe cichoracearum on Chicory in Two Meteorologically Different Growing Seasons

Efficacy of Three Natural Chemicals to Reduce the Damage of Erysiphe cichoracearum on Chicory in Two Meteorologically Different Growing Seasons

A Test of Taxonomic and Biogeographic Predictivity: Resistance to Soft Rot in Wild Relatives of Cultivated Potato

Survival of Softrot Bacteria during the Storage of Witloof Chicory Roots

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