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Effect of leaf scar age, chilling and freezing-thawingon infection of Pseudomonas syringae pv. syringae through leaf scars and lenticels in stone fruits

Published online by Cambridge University Press:  22 March 2013

Tiesen Cao ,
Bruce C. Kirkpatrick ,
Kenneth A. Shackel  and
Theodore M. DeJong
Tiesen Cao*
Affiliation:
Dep. Agric. Food Nutr. Sci., Univ. Alberta, Edmonton, AB T6G 2P5, Canada. tiesen.cao@ualberta.ca ,
Bruce C. Kirkpatrick
Affiliation:
Dep. Plant Pathol., Univ. California, Davis, CA 95616, USA
Kenneth A. Shackel
Affiliation:
Dep. Plant Sci./Pomol., Univ. California, Davis, CA 95616, USA
Theodore M. DeJong
Affiliation:
Dep. Plant Sci./Pomol., Univ. California, Davis, CA 95616, USA
*
* Correspondence and reprints
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Abstract

Introduction. Bacterial canker,caused by P. syringae pv. syringae,is an important disease of stone fruit worldwide. The possibilityof P. syringae pv. syringae infectionthrough leaf scars and lenticels was evaluated in cherry, peachand prune. Materials and methods. Laboratory and fieldinoculations were performed using cherry, peach and prune stemsto evaluate leaf scar age, chilling and freezing-thawing on bacterialinfection through leaf scars and lenticels. Results and discussion. Increasingleaf scar age was associated with significant decreases in diseaseincidence and length of lesions resulting from leaf scar inoculationwith Pseudomonas syringae pv. syringae incherry, peach and prune. A significant reduction in incidence andlesion length was observed after 4 h of air exposure, and both measuresof infection were reduced to essentially 0 by 2 days of exposure. Prolongedchilling temperature (2.2 °C) prior to leaf removal had no cleareffect on disease incidence of leaf scar infection, but significantlydecreased lesion length due to leaf scar infection. Cherry was more susceptibleto P. syringae pv. syringae infectionthrough leaf scars than peach and ‘French’ prune. The leaf scar inoculationresults were consistent with the previous studies. The disease incidenceof lenticel infection caused by bacterial inoculation in ‘French’prune was very low, but significantly higher than the water control.Freezing-thawing significantly increased both the disease incidence andthe lesion size via lenticel infection. The lenticel inoculationdata suggest that P. syringae pv. syringae infection throughlenticels is possible under field conditions.

Keywords

USAPrunus persicaPrunus aviumPrunus domesticaplant diseasescankersPseudomonas syringaeexperimental infectionlenticelslesionsÉtats-UnisPrunus persicaPrunus aviumPrunus domesticamaladie des planteschancrePseudomonas syringaeinfection expérimentalelenticellelésionEUAPrunus persicaPrunus aviumPrunus domesticaenfermedades de las plantasnecrosis cancerosaPseudomonas syringaeinfección experimentallenticellesiones
Type
Research Article
Information
Fruits , Volume 68 , Issue 2 , March 2013 , pp. 159 - 169
Copyright
© 2013 Cirad/EDP Sciences

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