Abstract
The bacterium Xylella fastidiosa subsp. pauca is associated with the “olive quick decline syndrome” in the Apulia region of southern Italy. To investigate control of this phytopathogen, a compound containing zinc and copper complexed with citric-acid hydracids (Dentamet®) was evaluated for in vitro and in planta bactericidal activity. Confocal laser scanning microscopy, fluorescent quantification and atomic emission spectroscopy were then used to determine if the compound reached the xylem networks of leaves, twigs and branches of olive, to release zinc and copper within the xylem. A 3-year field trial in an olive orchard containing mature Cellina di Nardò and Ogliarola salentina olive trees, and officially declared infected by X. fastidiosa subsp. pauca,was also carried out o to determine if the compound affected severity of the disease. Each year, from early April to October (excluding July and August), six spray treatments of 0.5% (v:v) Dentamet® were applied on the olive tree crowns. The compound reduced severity of symptoms in both cultivars. Most untreated trees died by the end of the trial, whereas all treated trees survived with good vegetative status as assessed by a normalized difference vegetation index. Quantitative real-time PCR was performed from June 2016 to September 2017, following the official procedures established by the European and Mediterranean Plant Protection Organization. The analysis revealed a statistically significant reduction of X. fastidiosa cell densities within the leaves of treated trees. These promising results suggest that integrated management to reduce severity of X. fastidiosa that includes regular pruning and soil harrowing with spring and summer spray treatments with Dentamet®, is likely to effectively control the disease.
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Claims 4
Claim · model-written summary
Spray treatments with Dentamet reduced the severity of Xylella symptoms in both olive cultivars.
- Taxon
- olive trees
Olea europaeat0 - Treatment
- six spray treatments of 0.5% (v:v) Dentamet®e2
- Interactor
- Xylella fastidiosa subsp. pauca
Xylella fastidiosa subsp. paucae0pathogen - Outcome
- severity of symptomse1
- Direction
- reducede1
- Comparator
- untreated treese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The bacterium Xylella fastidiosa subsp. pauca is associated”
e1“The compound reduced severity of symptoms in both cultivars”
e2“Each year, from early April to October (excluding July and August), six spray treatments of 0.5% (v:v) Dentamet® were applied on the olive tree crowns”
e3“Most untreated trees died by the end of the trial, whereas all treated trees survived”
t0“for control of Xylella fastidiosa subsp. pauca in olive trees”
Claim · model-written summary
All treated olive trees survived the trial, while most untreated trees died.
- Taxon
- olive treesOlea europaeat0
- Treatment
- six spray treatments of 0.5% (v:v) Dentamet®e2
- Outcome
- survivede3
- Qualifier
- good vegetative status as assessed by a normalized difference vegetation indexe3
- Comparator
- untreated treese3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Each year, from early April to October (excluding July and August), six spray treatments of 0.5% (v:v) Dentamet® were applied on the olive tree crowns”
e3“Most untreated trees died by the end of the trial, whereas all treated trees survived with good vegetative status as assessed by a normalized difference vegetation index”
t0“for control of Xylella fastidiosa subsp. pauca in olive trees”
Claim · model-written summary
Treated olive trees showed a statistically significant reduction in X. fastidiosa cell densities in the leaves.
- Taxon
- olive treesOlea europaeat0
- Material
- Cellina di Nardòe4
- Treatment
- six spray treatments of 0.5% (v:v) Dentamet®e2
- Interactor
- X. fastidiosaXylella fastidiosae5pathogen
- Outcome
- X. fastidiosa cell densitiese5
- Direction
- reductione5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“A 3-year field trial in an olive orchard containing mature Cellina di Nardò and Ogliarola salentina olive trees”
e5“The analysis revealed a statistically significant reduction of X. fastidiosa cell densities within the leaves of treated trees”
e2“Each year, from early April to October (excluding July and August), six spray treatments of 0.5% (v:v) Dentamet® were applied on the olive tree crowns”
t0“for control of Xylella fastidiosa subsp. pauca in olive trees”
Claim · model-written summary
The authors suggest integrated management with spray treatments is likely to control the disease effectively.
- Taxon
- olive treesOlea europaeat0
- Outcome
- control the diseasee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“These promising results suggest that integrated management to reduce severity of X. fastidiosa that includes regular pruning and soil harrowing with spring and summer spray treatments with Dentamet®, is likely to effectively control the disease”
t0“for control of Xylella fastidiosa subsp. pauca in olive trees”
The same questions in other papers
application · Xylella fastidiosa subsp. pauca · Olea europaea (common olive)Results agree
1 paper in the same direction as this paper
- positive
application · Xylella fastidiosa · Olea europaea (common olive)Results agree
2 papers in the same direction as this paper
- positive
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.