Abstract
The effects of temperature and relative humidity on Peronospora destructor sporulation on onion (Allium cepa) leaves were studied under controlled environmental conditions. Sporangia were produced most rapidly at 8 to 12°C after 5 h of high humidity during dark periods. The greatest number of sporangia was produced at 100% relative humidity (RH), and sporulation decreased to almost nil when humidity decreased to 93% RH. A model, named MILIONCAST (an acronym for MILdew on onION foreCAST), was developed based on the data from these controlled environment studies to predict the rate of sporulation in relation to temperature and relative humidity. The accuracy of prediction of sporulation was evaluated by comparing predictions with observations of sporulation on infected plants in pots outdoors. The accuracy of MILIONCAST was compared with the accuracy of existing models based on DOWNCAST. MILIONCAST gave more correct predictions of sporulation than the DOWNCAST models and a random model. All models based on DOWNCAST were more accurate than the random model when compared on the basis of all predictions (including positive and negative predictions), but they gave fewer correct predictions of sporulation than the random model. De Visser's DOWNCAST and ONIMIL improved their accuracy of prediction of sporulation events when the threshold humidity for sporulation was reduced to 92% RH. The temporal pattern of predicted sporulation by MILIONCAST generally corresponded well to the pattern of sporulation observed on the outdoor potted plants at Wellesbourne, UK.
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Claims 8
Claim · model-written summary
Sporangia were produced most rapidly at 8 to 12°C after 5 h of high humidity during dark periods on onion.
- Taxon
- Onions
Allium cepat0 - Treatment
- 8 to 12°C after 5 h of high humidity during dark periodse1
- Interactor
- Peronospora destructor
Peronospora destructore0pathogen - Outcome
- Sporangiae1
- Direction
- most rapidlye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Downy Mildew Sporulation on Onions”
e0“Peronospora destructor sporulation on onion (Allium cepa) leaves”
e1“Sporangia were produced most rapidly at 8 to 12°C after 5 h of high humidity during dark periods”
Claim · model-written summary
The greatest number of sporangia was produced at 100% relative humidity on onion.
- Taxon
- OnionsAllium cepat0
- Treatment
- 100% relative humidity (RH)e2
- Interactor
- Peronospora destructorPeronospora destructore0pathogen
- Outcome
- number of sporangiae2
- Direction
- greateste2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Downy Mildew Sporulation on Onions”
e0“Peronospora destructor sporulation on onion (Allium cepa) leaves”
e2“The greatest number of sporangia was produced at 100% relative humidity (RH)”
Claim · model-written summary
Sporulation decreased to almost nil when humidity decreased to 93% RH on onion.
- Taxon
- OnionsAllium cepat0
- Treatment
- humidity decreased to 93% RHe3
- Interactor
- Peronospora destructorPeronospora destructore0pathogen
- Outcome
- sporulatione3
- Direction
- decreasede3
- Value
- almost nile3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Downy Mildew Sporulation on Onions”
e0“Peronospora destructor sporulation on onion (Allium cepa) leaves”
e3“sporulation decreased to almost nil when humidity decreased to 93% RH”
Claim · model-written summary
MILIONCAST gave more correct predictions of sporulation than the DOWNCAST models and a random model.
- Taxon
- OnionsAllium cepat0
- Outcome
- correct predictions of sporulatione4
- Direction
- moree4
- Comparator
- DOWNCAST models and a random modele4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Downy Mildew Sporulation on Onions”
e4“MILIONCAST gave more correct predictions of sporulation than the DOWNCAST models and a random model”
Claim · model-written summary
All DOWNCAST-based models were more accurate than a random model when all predictions were compared.
- Taxon
- OnionsAllium cepat0
- Outcome
- accuratee5
- Direction
- moree5
- Comparator
- random modele5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Downy Mildew Sporulation on Onions”
e5“All models based on DOWNCAST were more accurate than the random model when compared on the basis of all predictions”
Claim · model-written summary
DOWNCAST-based models gave fewer correct predictions of sporulation than the random model.
- Taxon
- OnionsAllium cepat0
- Outcome
- correct predictions of sporulatione6
- Direction
- fewere6
- Comparator
- random modele6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Downy Mildew Sporulation on Onions”
e6“they gave fewer correct predictions of sporulation than the random model”
Claim · model-written summary
Lowering the threshold humidity for sporulation to 92% RH improved the accuracy of DOWNCAST and ONIMIL in predicting sporulation events.
- Taxon
- OnionsAllium cepat0
- Treatment
- threshold humidity for sporulation was reduced to 92% RHe7
- Outcome
- accuracy of prediction of sporulation eventse7
- Direction
- improvede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Downy Mildew Sporulation on Onions”
e7“DOWNCAST and ONIMIL improved their accuracy of prediction of sporulation events when the threshold humidity for sporulation was reduced to 92% RH”
Claim · model-written summary
The temporal pattern of MILIONCAST-predicted sporulation generally corresponded well to the pattern of sporulation observed on outdoor potted onion plants.
- Taxon
- OnionsAllium cepat0
- Outcome
- temporal pattern of predicted sporulatione7
- Direction
- corresponded welle7
- Comparator
- pattern of sporulation observed on the outdoor potted plantse7
- Setting
- Wellesbourne, UKe7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Downy Mildew Sporulation on Onions”
e7“The temporal pattern of predicted sporulation by MILIONCAST generally corresponded well to the pattern of sporulation observed on the outdoor potted plants at Wellesbourne, UK”
The same questions in other papers
humidity · disease · Allium cepa (onion)Positive and negative results
3 papers in the same direction as this paper · 3 in the opposite direction
- negative
- negative
- negative
3 papers more in this group
See all 7 papers →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.