Abstract
Alternaria dauci and Cercospora carotae cause foliar blight on carrot and can reduce yield in severely blighted fields. Historically, fungicides are applied every 7 to 14 days even though applications may be made when environmental conditions do not favor blight development. The purpose of this study was to compare a calendar-based application schedule with three disease forecasting systems for timing fungicide sprays to limit foliar blight, and included (i) an A. dauci disease forecaster, (ii) TOM-CAST, using a threshold of 15 disease severity values, and (iii) a disease forecaster developed to control C. apii on celery. Chlorothalonil was applied weekly or according to the forecasting systems to blight-susceptible 'Cellobunch' carrot plants in 2001 and 2002. Overall petiole health was poor ≥8.3; 10 = 100% petiole necrosis) when fungicides were not used. Although all disease forecasters maintained petiole health (≤5.3; 1 = healthy and vigorous), the TOM-CAST program had the best petiole health rating each year (≤2.8). TOM-CAST prompted 38 to 54% fewer applications than the weekly application schedule, resulting in a fungicide savings of $105 and $147/ha in 2001 and 2002, respectively, while providing similar blight control. The number of sprays also was reduced when fungicides were applied according to the A. dauci and C. apii forecasters, but acceptable blight control was not always achieved.
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Claims 7
Claim · model-written summary
Without fungicides, carrot petiole health was poor.
- Taxon
- carrot
Daucus carotae0 - Treatment
- fungicides were not usede1
- Interactor
- Alternaria dauciAlternaria daucie0pathogen
- Second interactor
- Cercospora carotaeNeocercospora carotaee0pathogen
- Outcome
- Overall petiole healthe1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alternaria dauci and Cercospora carotae cause foliar blight on carrot”
e1“Overall petiole health was poor ≥8.3; 10 = 100% petiole necrosis) when fungicides were not used”
Claim · model-written summary
TOM-CAST gave the best petiole health rating in each year, although all forecasters kept petiole health acceptable.
- Taxon
- carrotDaucus carotae0
- Treatment
- TOM-CASTe2
- Outcome
- petiole health ratinge2
- Direction
- beste2
- Value
- ≤2.8e2
- Comparator
- all disease forecasterse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alternaria dauci and Cercospora carotae cause foliar blight on carrot”
e2“Although all disease forecasters maintained petiole health (≤5.3; 1 = healthy and vigorous), the TOM-CAST program had the best petiole health rating each year (≤2.8)”
Claim · model-written summary
TOM-CAST prompted 38 to 54% fewer fungicide applications than the weekly schedule.
- Taxon
- carrotDaucus carotae0
- Treatment
- TOM-CASTe3
- Outcome
- applicationse3
- Direction
- fewere3
- Value
- 38 to 54%e3
- Comparator
- weekly application schedulee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alternaria dauci and Cercospora carotae cause foliar blight on carrot”
e3“TOM-CAST prompted 38 to 54% fewer applications than the weekly application schedule”
Claim · model-written summary
TOM-CAST gave a fungicide saving of $105 and $147/ha in 2001 and 2002.
- Taxon
- carrotDaucus carotae0
- Treatment
- TOM-CASTe3
- Outcome
- fungicide savingse4
- Value
- $105 and $147/hae4
- Comparator
- weekly application schedulee3
- Setting
- 2001 and 2002e4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alternaria dauci and Cercospora carotae cause foliar blight on carrot”
e3“TOM-CAST prompted 38 to 54% fewer applications than the weekly application schedule”
e4“resulting in a fungicide savings of $105 and $147/ha in 2001 and 2002”
Claim · model-written summary
TOM-CAST gave blight control similar to the weekly schedule.
- Taxon
- carrotDaucus carotae0
- Treatment
- TOM-CASTe3
- Interactor
- Alternaria dauciAlternaria daucie0pathogen
- Second interactor
- Cercospora carotaeNeocercospora carotaee0pathogen
- Outcome
- blight controle5
- Direction
- similare5
- Comparator
- weekly application schedulee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alternaria dauci and Cercospora carotae cause foliar blight on carrot”
e3“TOM-CAST prompted 38 to 54% fewer applications than the weekly application schedule”
e5“while providing similar blight control”
Claim · model-written summary
Spraying according to the A. dauci and C. apii forecasters reduced the number of sprays.
- Taxon
- carrotDaucus carotae0
- Treatment
- A. dauci and C. apii forecasterse6
- Outcome
- number of sprayse6
- Direction
- reducede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alternaria dauci and Cercospora carotae cause foliar blight on carrot”
e6“The number of sprays also was reduced when fungicides were applied according to the A. dauci and C. apii forecasters”
Claim · model-written summary
Acceptable blight control was not always achieved with the A. dauci and C. apii forecasters.
- Taxon
- carrotDaucus carotae0
- Treatment
- A. dauci and C. apii forecasterse6
- Interactor
- Alternaria dauciAlternaria daucie0pathogen
- Second interactor
- Cercospora carotaeNeocercospora carotaee0pathogen
- Outcome
- acceptable blight controle7
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alternaria dauci and Cercospora carotae cause foliar blight on carrot”
e6“The number of sprays also was reduced when fungicides were applied according to the A. dauci and C. apii forecasters”
e7“acceptable blight control was not always achieved”
The same questions in other papers
Alternaria dauci · disease · Daucus carota (carrot)Results agree
1 paper in the same direction as this paper
- negative
fungicide · Alternaria dauci · Daucus carota (carrot)Positive and negative results
1 paper in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
1 paper more in this group
See all 5 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.