Abstract
Alternaria leaf blight, caused by Alternaria dauci, is a major constraint to carrot production in Israel. Israeli carrot growers apply prophylactic sprays at 3- to 10-day intervals throughout the season until harvest, up to 30 sprays in a growing season. In this study, we attempted to optimize the chemical suppression of the disease, in order to reduce fungicide use. The efficacy of nine fungicides was determined in two field experiments. All fungicides reduced disease severity, but there were significant differences in efficacy among them. The most effective were difenoconazole and chlorothalonil; less effective were copper hydroxide, tebuconazole, trifloxystrobin, and mancozeb; the least effective in our experiments were flutrifol, propineb, and iprodione. The effect of the time of spray initiation on fungicide efficacy was determined in three field experiments. Qualitative (analysis of variance) and quantitative (regression) analyses of the data revealed that initiating sprays after disease onset reduced control efficacy. Thus, an action threshold model could not be developed for A. dauci in carrots. The time before harvest at which sprays could be terminated was tested in two field experiments and it was found that terminating sprays 14 days before harvest did not significantly affect the overall control efficacy. The main conclusions derived from these experiments were tested and corroborated in two additional field experiments.
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Claims 8
Claim · model-written summary
All tested fungicides reduced disease severity.
- Taxon
- Carrots
Daucus carotat0 - Treatment
- fungicidese0
- Outcome
- disease severitye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Carrots”
e0“All fungicides reduced disease severity”
Claim · model-written summary
Fungicide efficacy differed significantly.
- Taxon
- CarrotsDaucus carotat0
- Outcome
- differences in efficacye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Carrots”
e0“there were significant differences in efficacy among them”
Claim · model-written summary
Difenoconazole and chlorothalonil were most effective.
- Taxon
- CarrotsDaucus carotat0
- Treatment
- difenoconazole and chlorothalonile0
- Outcome
- most effectivee0
- Direction
- most effectivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Carrots”
e0“The most effective were difenoconazole and chlorothalonil”
Claim · model-written summary
Copper hydroxide, tebuconazole, trifloxystrobin and mancozeb were less effective.
- Taxon
- CarrotsDaucus carotat0
- Treatment
- copper hydroxide, tebuconazole, trifloxystrobin, and mancozebe0
- Outcome
- less effectivee0
- Direction
- less effectivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Carrots”
e0“less effective were copper hydroxide, tebuconazole, trifloxystrobin, and mancozeb”
Claim · model-written summary
Flutrifol, propineb and iprodione were least effective.
- Taxon
- CarrotsDaucus carotat0
- Treatment
- flutrifol, propineb, and iprodionee0
- Outcome
- least effectivee0
- Direction
- least effectivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Carrots”
e0“the least effective in our experiments were flutrifol, propineb, and iprodione”
Claim · model-written summary
Starting sprays after disease onset reduced control efficacy.
- Taxon
- CarrotsDaucus carotat0
- Treatment
- initiating sprays after disease onsete0
- Outcome
- control efficacye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Carrots”
e0“initiating sprays after disease onset reduced control efficacy”
Claim · model-written summary
An action threshold model could not be developed for A. dauci in carrots.
- Taxon
- carrotsDaucus carotae0
- Interactor
- A. dauciAlternaria daucie0pathogen
- Outcome
- action threshold model could not be developede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an action threshold model could not be developed for A. dauci in carrots”
Claim · model-written summary
Stopping sprays 14 days before harvest did not significantly affect control efficacy.
- Taxon
- CarrotsDaucus carotat0
- Treatment
- terminating sprays 14 days before harveste0
- Outcome
- overall control efficacye0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Carrots”
e0“terminating sprays 14 days before harvest did not significantly affect the overall control efficacy”
The same questions in other papers
application · control · 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 →fungicide · disease · Daucus carota (carrot)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.