Distribution of <i>Xylella fastidiosa</i> in Blueberry Stem and Root Sections in Relation to Disease Severity in the Field

Holland, Renee; Christiano, R. S. C.; Gamliel-Atinsky, E.; Scherm, H.

doi:10.1094/pdis-06-13-0680-re

Cited by 31 publications

(23 citation statements)

References 14 publications

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“…Our experiments are the first to document that internal movement of E. tracheiphila 248 following infection is more rapid in a downward than upward direction. In common with other 249 xylem-limited vascular wilt diseases, symptom expression as indicated by visible wilt progressed 250 distally beyond the nodes from which the pathogen was recovered, presumably as sieve plates 251 became blocked and water flow ceased (Holland et al 2014, McElrone et al 2003. Such a 252 blockage of the upward movement of water inside the vascular system may help to explain our 253 observation that E. tracheiphila moved in a primarily downward rather than upward direction 254 from the inoculation point.…”

mentioning

confidence: 79%

Bacterial wilt symptoms are impacted by host age and involve net downward movement of Erwinia tracheiphila in muskmelon

Liu

Beattie

Rojas³

2018

Eur J Plant Pathol

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Cucurbit bacterial wilt, caused by Erwinia tracheiphila, is a damaging disease of cucurbit crops in the Midwest and Northeast U.S. Current management of bacterial wilt relies primarily on insecticide applications to control striped and spotted cucumber beetles (Acalymma vittatum and Diabrotica undecimpunctata howardi, respectively), which vector E. tracheiphila. Development of alternative management strategies is constrained by a lack of understanding of bacterial wilt etiology. The impact of host age on rate on symptom development and extent of bacterial movement in the xylem of muskmelon (Cucumis melo cv. Athena) was evaluated following wound inoculation of 2-to 8-week-old plants in growth chamber experiments. Wilting occurred more rapidly in plants after inoculating E. tracheiphila into 2-or 4-week-old plants than 6-or 8-week-old plants. Recovery of viable cells from stem segments revealed that vascular spread of E. tracheiphila was more extensive below than above the inoculation point. These findings provide experimental evidence that host age impacts the rate of symptom development in cucurbit bacterial wilt and that movement of the xyleminhabiting pathogen E. tracheiphila within muskmelon plants occurs primarily in the downward direction.

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mentioning

confidence: 79%

Bacterial wilt symptoms are impacted by host age and involve net downward movement of Erwinia tracheiphila in muskmelon

Liu

Beattie

Rojas³

2018

Eur J Plant Pathol

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“…As X. fastidiosa is confined to the xylem tissue of its hosts, the petiole and midrib recovered from leaf samples are the best source for diagnosis as they contain a higher number of xylem vessels (Hopkins, ). However, other sources of tissue include small twigs and roots of peach (Aldrich et al ., ), blueberry stem and roots (Holland et al ., ) and citrus fruit peduncles (Rossetti et al ., ).…”

Section: Detectionmentioning

confidence: 99%

PM 7/24 (3) Xylella fastidiosa

2018

EPPO Bulletin

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“…This is because of the difficulties in identifying early X. fastidiosa plant infections and of the rapid translocation of the bacteria to the roots. While symptomatic plant parts are removed by pruning, bacterial concentrations are not reduced significantly (Holland et al, 2014). On the contrary, new growth from flushing buds is likely to be readily invaded by X. fastidiosa and attract vector insects for bacteria acquisition (Marucci et al, 2004).…”

Section: Fastidiosamentioning

confidence: 99%

Four statements questioning the EU control strategy against Xylella fastidiosa

Bragard¹,

Caffier²,

Candresse³

et al. 2016

EFS2

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This opinion addresses questions concerning the EU control strategy against Xylella fastidiosa: i) factors affecting symptom expression and spread of X. fastidiosa; ii) the aetiology of the CoDiRO (Complesso del Disseccamento Rapido dell'Olivo) disease; iii) host plant removal as an option for containment or eradication; and iv) secondary effects of pesticides. Xylella fastidiosa subsp. pauca was shown to be the causal agent of the CoDiRO disease of olives by recent biological assays fulfilling Koch's postulates. Symptoms in X. fastidiosa infected plants develop because of wilting from water stress induced by bacteria clogging the xylem vessels. Therefore, interventions supporting vigorous growth and development of the plant may improve its health status, its resilience, prolong its productive phase and extend the symptomless phase of the disease. The Panel considers removal of infected plants, in a system‐based approach, as the only option to prevent further spread of the pathogen to new areas. In the outer strip of the containment area bordering the buffer zone, removal of infected plants and stringent monitoring can be effective in preventing pathogen spread into the buffer zone. In areas of recent introduction, such as new outbreaks in the buffer zone, the stringent removal of both infected plants and all host plants irrespective of their health status within a radius, as described in current EU legislation, can be effective in reducing pathogen spread, when rigorously administered and new infections are detected in time. Finally, the reduction of vector populations by application of chemical or biological means, mechanical treatments, or other sustainable methods, can have effects in slowing down the pathogen spread. Concerning the use of pesticides, there is currently no evidence of negative effects of such treatments on the interaction of X. fastidiosa with infected olive trees, the severity of symptoms and the outcome of the infection.

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Distribution of Xylella fastidiosa in Blueberry Stem and Root Sections in Relation to Disease Severity in the Field

Abstract: Holland, R. M., Christiano, R. S. C, Gamliel-Atinsky, E., and Scherni. H. 2014. Distribution of Xylella fastidiosa in blueberry stem and root sections in relation to disease severity in the field. Plant

Cited by 31 publications

References 14 publications

Bacterial wilt symptoms are impacted by host age and involve net downward movement of Erwinia tracheiphila in muskmelon

Bacterial wilt symptoms are impacted by host age and involve net downward movement of Erwinia tracheiphila in muskmelon

PM 7/24 (3) Xylella fastidiosa

Four statements questioning the EU control strategy against Xylella fastidiosa

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