Abstract
Silicon amendments to hydroponic nutrient solutions have been used successfully in Canada to suppress powdery mildew (PM) caused by Sphaerotheca fuliginea on cucumber (Cucumis sativus). In contrast, preliminary trials in Florida greenhouses failed to achieve the level of disease suppression reported in the literature for Canadian studies. A series of greenhouse experiments were conducted in Florida to determine the factors involved in reducing the effectiveness of silicon amendments for PM suppression on cucumber. Three horticultural practices (cultivar, nutrient solution formula, and rooting medium) and two environmental factors (light intensity and temperature) were tested in combination with silicon amendments for their effects on the suppression of PM on cucumber. When plants were irrigated with a standard nutrient solution amended with potassium silicate at 0 mg/liter, the cucumber cv. Vetomil was found to be resistant and cvs. Corona, Cilla, Farbio, and Toska were found to be susceptible to PM. Susceptible cultivars irrigated with potassium silicate at 100, 150, or 200 mg/liter exhibited a slight but statistically significant reduction in PM over the course of a 49-day trial. Although PM in the cultivar trial was slightly lower in treatments with added silicon, disease suppression with silicon was not commercially useful because it failed to increase fruit yields. Nutrient solution formula, rooting medium, and light intensity had no effects on the levels of PM suppression, regardless of whether plants were irrigated with potassium silicate at 0 or 100 mg/liter. Temperature was found to act in a synergistic manner with silicon. The greatest effect of temperature on PM suppression was observed at 20°C in which cucumber plants, irrigated with silicon at 100 mg/liter, exhibited significant reductions in the numbers of PM colonies per leaf. Disease suppression by silicon was observed at 25 and 30°C, but the magnitude of the disease suppression was significantly lower than when plants were maintained at 20°C. The effect of temperature on PM suppression by silicon may explain the difference in results between previous experiments in Canada, where greenhouse temperatures averaged 20 to 25°C, and the current study in Florida, where greenhouse temperatures averaged 24 to 32°C.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 10
Claim · model-written summary
Cucumber cultivar Vetomil was resistant to powdery mildew.
- Taxon
- cucumber
Cucumis sativuse0 - Material
- cv. Vetomile1
- Interactor
- Sphaerotheca fuliginea
Podosphaera fuligineae0pathogen - Outcome
- resistante1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“powdery mildew (PM) caused by Sphaerotheca fuliginea on cucumber (Cucumis sativus)”
e1“the cucumber cv. Vetomil was found to be resistant”
Claim · model-written summary
Cucumber cultivars Corona, Cilla, Farbio and Toska were susceptible to powdery mildew.
- Taxon
- cucumberCucumis sativuse0
- Material
- Corona, Cilla, Farbio, and Toskae2
- Interactor
- Sphaerotheca fuligineaPodosphaera fuligineae0pathogen
- Outcome
- susceptiblee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“powdery mildew (PM) caused by Sphaerotheca fuliginea on cucumber (Cucumis sativus)”
e2“cvs. Corona, Cilla, Farbio, and Toska were found to be susceptible to PM”
Claim · model-written summary
Potassium silicate at 100, 150 or 200 mg/liter gave a slight but significant reduction in powdery mildew on susceptible cucumber cultivars over a 49-day trial.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- potassium silicate at 100, 150, or 200 mg/litere3
- Interactor
- Sphaerotheca fuligineaPodosphaera fuligineae0pathogen
- Outcome
- PMe3
- Direction
- reductione3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“powdery mildew (PM) caused by Sphaerotheca fuliginea on cucumber (Cucumis sativus)”
e3“Susceptible cultivars irrigated with potassium silicate at 100, 150, or 200 mg/liter exhibited a slight but statistically significant reduction in PM over the course of a 49-day trial”
Claim · model-written summary
Disease suppression with silicon was not commercially useful because it failed to increase fruit yields.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- silicone4
- Interactor
- Sphaerotheca fuligineaPodosphaera fuligineae0pathogen
- Outcome
- fruit yieldse4
- Direction
- failed to increasee4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“powdery mildew (PM) caused by Sphaerotheca fuliginea on cucumber (Cucumis sativus)”
e4“disease suppression with silicon was not commercially useful because it failed to increase fruit yields”
Claim · model-written summary
Nutrient solution formula had no effect on the levels of powdery mildew suppression by silicon.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- Nutrient solution formulae5
- Interactor
- Sphaerotheca fuligineaPodosphaera fuligineae0pathogen
- Outcome
- levels of PM suppressione5
- Direction
- no effectse5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“powdery mildew (PM) caused by Sphaerotheca fuliginea on cucumber (Cucumis sativus)”
e5“Nutrient solution formula, rooting medium, and light intensity had no effects on the levels of PM suppression, regardless of whether plants were irrigated with potassium silicate at 0 or 100 mg/liter”
Claim · model-written summary
Rooting medium had no effect on the levels of powdery mildew suppression by silicon.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- rooting mediume5
- Interactor
- Sphaerotheca fuligineaPodosphaera fuligineae0pathogen
- Outcome
- levels of PM suppressione5
- Direction
- no effectse5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“powdery mildew (PM) caused by Sphaerotheca fuliginea on cucumber (Cucumis sativus)”
e5“Nutrient solution formula, rooting medium, and light intensity had no effects on the levels of PM suppression, regardless of whether plants were irrigated with potassium silicate at 0 or 100 mg/liter”
Claim · model-written summary
Light intensity had no effect on the levels of powdery mildew suppression by silicon.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- light intensitye5
- Interactor
- Sphaerotheca fuligineaPodosphaera fuligineae0pathogen
- Outcome
- levels of PM suppressione5
- Direction
- no effectse5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“powdery mildew (PM) caused by Sphaerotheca fuliginea on cucumber (Cucumis sativus)”
e5“Nutrient solution formula, rooting medium, and light intensity had no effects on the levels of PM suppression, regardless of whether plants were irrigated with potassium silicate at 0 or 100 mg/liter”
Claim · model-written summary
Temperature acted synergistically with silicon in suppressing powdery mildew.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- Temperaturee6
- Interactor
- Sphaerotheca fuligineaPodosphaera fuligineae0pathogen
- Outcome
- PM suppressione7
- Direction
- synergistic mannere6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“powdery mildew (PM) caused by Sphaerotheca fuliginea on cucumber (Cucumis sativus)”
e6“Temperature was found to act in a synergistic manner with silicon”
e7“The greatest effect of temperature on PM suppression was observed at 20°C in which cucumber plants, irrigated with silicon at 100 mg/liter, exhibited significant reductions in the numbers of PM colonies per leaf”
Claim · model-written summary
At 20°C, silicon at 100 mg/liter gave significant reductions in powdery mildew colonies per leaf on cucumber.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- silicon at 100 mg/litere7
- Interactor
- Sphaerotheca fuligineaPodosphaera fuligineae0pathogen
- Outcome
- numbers of PM colonies per leafe7
- Direction
- reductionse7
- Qualifier
- 20°Ce7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“powdery mildew (PM) caused by Sphaerotheca fuliginea on cucumber (Cucumis sativus)”
e7“The greatest effect of temperature on PM suppression was observed at 20°C in which cucumber plants, irrigated with silicon at 100 mg/liter, exhibited significant reductions in the numbers of PM colonies per leaf”
Claim · model-written summary
Silicon-mediated disease suppression at 25 and 30°C was significantly lower in magnitude than at 20°C.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- 25 and 30°Ce7
- Interactor
- Sphaerotheca fuligineaPodosphaera fuligineae0pathogen
- Outcome
- magnitude of the disease suppressione7
- Direction
- significantly lowere7
- Comparator
- 20°Ce7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“powdery mildew (PM) caused by Sphaerotheca fuliginea on cucumber (Cucumis sativus)”
e7“Disease suppression by silicon was observed at 25 and 30°C, but the magnitude of the disease suppression was significantly lower than when plants were maintained at 20°C”
The same questions in other papers
silicon atom · Podosphaera fuliginea · Cucumis sativus (cucumber)Positive and negative results
6 papers in the same direction as this paper · 1 in the opposite direction
- positive
- positive
- no effect
4 papers more in this group
See all 8 papers →fertilization · Podosphaera fuliginea · Cucumis sativus (cucumber)Positive and negative results
2 in the opposite direction
- positive
- positive
potassium · Podosphaera fuliginea · Cucumis sativus (cucumber)Results 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.