Abstract
Downy mildew, caused by Plasmopara viticola, is a major threat to grapevine (Vitis vinifera) cultivation in humid climates. Restrictions on synthetic pesticides and inconsistent efficacy of current biocontrol agents, especially under rainy conditions, complicate disease management. This study evaluated the potential of compost tea to suppress downy mildew in a two-year field experiment (2023 and 2024), combined with reduced synthetic fungicide applications. The study design compared two phytosanitary management strategies on a commercial vineyard: a conventional fungicide against a compost tea strategy supplemented with two cymoxanil applications. The experiment set up had three replicated blocks, each consisting of 100 plants for a total of 600 plants. Mechanistic insights were provided through controlled laboratory experiments involving pre- and post-infection leaf assays, vineyard bacteriome profiling, via 16S rRNA gene sequencing for bacterial communities, across vineyard compartments, i.e., bulk soil, rhizosphere, and phyllosphere, and grapevine metabolomic analysis by GC-MS analysis. Field trials demonstrated that compost tea combined with two fungicide applications effectively reduced disease severity, notably outperforming the fungicide alone in the particularly rainy year of 2023. Bacteriome analysis revealed that compost tea treatment enriched beneficial bacterial genera, including Pseudomonas, Sphingomonas, Enterobacter, Massilia, and Bacillus, known for their growth-promoting and biocontrol activity in the rhizosphere and phyllosphere. Laboratory assays on detached leaves further showed that compost tea alone could suppress both infection and sporulation of P. viticola. Metabolomic analysis highlighted the accumulation of compounds such as tartaric and shikimic acids in compost tea treated leaves, suggesting a potential role in induced resistance. The findings indicate that applying compost tea with reduced fungicide treatments represents a promising and sustainable strategy for managing grapevine downy mildew, even in challenging climates.
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Claims 7
Claim · model-written summary
Compost tea with two fungicide applications reduced downy mildew severity, outperforming fungicide alone in rainy 2023.
- Treatment
- compost tea combined with two fungicide applicationse0
- Interactor
- Plasmopara viticola
Plasmopara viticolae1pathogen - Outcome
- disease severitye0
- Direction
- reducede0
- Qualifier
- particularly rainy year of 2023e0
- Comparator
- fungicide alonee0
VitisOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compost tea combined with two fungicide applications effectively reduced disease severity, notably outperforming the fungicide alone in the particularly rainy year of 2023”
t0“Grapevine”
e1“Downy mildew, caused by Plasmopara viticola”
Claim · model-written summary
Compost tea enriched Pseudomonas, Sphingomonas and Enterobacter in the rhizosphere and phyllosphere.
- Organ / stage
- rhizosphere and phyllospheree0
- Treatment
- compost tea treatmente0
- Interactor
- Pseudomonas
Pseudomonase0symbiont - Outcome
- Pseudomonas, Sphingomonas, Enterobactere0
- Direction
- enrichede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compost tea treatment enriched beneficial bacterial genera, including Pseudomonas, Sphingomonas, Enterobacter, Massilia, and Bacillus, known for their growth-promoting and biocontrol activity in the rhizosphere and phyllosphere”
t0“Grapevine”
Claim · model-written summary
Compost tea enriched Massilia and Bacillus in the rhizosphere and phyllosphere.
- Organ / stage
- rhizosphere and phyllospheree0
- Treatment
- compost tea treatmente0
- Outcome
- Massilia, and Bacilluse0
- Direction
- enrichede0
MassiliaNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compost tea treatment enriched beneficial bacterial genera, including Pseudomonas, Sphingomonas, Enterobacter, Massilia, and Bacillus, known for their growth-promoting and biocontrol activity in the rhizosphere and phyllosphere”
t0“Grapevine”
Claim · model-written summary
Compost tea alone suppressed P. viticola infection on detached leaves.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compost tea alone could suppress both infection and sporulation of P. viticola”
t0“Grapevine”
Claim · model-written summary
Compost tea alone suppressed P. viticola sporulation on detached leaves.
- Treatment
- compost tea alonee0
- Interactor
- P. viticolae0pathogen
- Outcome
- sporulation of P. viticolae0
- Direction
- suppresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compost tea alone could suppress both infection and sporulation of P. viticola”
t0“Grapevine”
Claim · model-written summary
Tartaric and shikimic acids accumulated in compost tea treated leaves.
- Organ / stage
- leavese0
- Treatment
- compost teae0
- Outcome
- accumulation of compounds such as tartaric and shikimic acidse0
- Direction
- accumulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the accumulation of compounds such as tartaric and shikimic acids in compost tea treated leaves”
t0“Grapevine”
Claim · model-written summary
The authors suggest compost tea with reduced fungicide treatment for downy mildew management.
- Outcome
- applying compost tea with reduced fungicide treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“applying compost tea with reduced fungicide treatments represents a promising and sustainable strategy for managing grapevine downy mildew”
The same questions in other papers
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- negative
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44 papers in the same direction as this paper · 7 in the opposite direction · 1 reporting no difference from an alternative
- positive
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See all 53 papers →fertilization · Plasmopara viticola · VitisResults agree
1 paper in the same direction as this paper
- 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.