Abstract
Attempts to control Fusarium head blight (FHB) with fungicides have been highly variable. Variability is caused by cultivar resistance, fungicide efficacy, fungicide coverage, timing, and pathogen aggressiveness. In this research, fungicides were tested on winter wheat cultivars with different levels of resistance to FHB using different isolates of Fusarium graminearum and F. culmorum to evaluate the role of host resistance and isolate aggressiveness on severity of FHB. Fungicides were applied to groups of wheat heads to provide full coverage. Incidence and severity of FHB was measured by the severity of head symptoms, percentage of Fusarium-damaged kernels (FDK), yield loss, and deoxynivalenol (DON) contamination. Development of FHB was affected by fungicides, cultivars, fungal isolates, and most of the two-way interactions of these variables. Among the fungicides tested, those containing tebuconazole tended to be more effective in reducing FHB. Reduction of disease in susceptible cultivars may not be adequate to produce marketable yields under conditions of high disease pressure. In most cases, if a fungicide reduced FHB visual symptoms, similar decreases were detected in yield loss, DON concentration, and FDK reaction. In 1998, an increase in DON contamination compared with the Fusarium check was observed with azoxystrobin and carbendazim on the more susceptible cultivar. This increase in DON with some fungicide requires additional research. Research to develop more resistant cultivars, better spraying technology, and more effective fungicides is also needed.
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Claims 8
Claim · model-written summary
Head blight development varied with fungicides, cultivars, isolates and most pairwise interactions.
- Taxon
- Wheat
Triticum aestivumt0 - Treatment
- fungicidese0
- Interactor
- fungal isolatese0pathogen
- Outcome
- Development of FHBe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Development of FHB was affected by fungicides, cultivars, fungal isolates, and most of the two-way interactions of these variables”
t0“Wheat”
Claim · model-written summary
Fungicides containing tebuconazole tended to reduce head blight more effectively.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- those containing tebuconazolee0
- Outcome
- FHBe0
- Direction
- reducinge0
- Comparator
- fungicides testede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Among the fungicides tested, those containing tebuconazole tended to be more effective in reducing FHB”
t0“Wheat”
Claim · model-written summary
Disease reduction in susceptible cultivars might be insufficient for marketable yield under high disease pressure.
- Taxon
- WheatTriticum aestivumt0
- Material
- susceptible cultivarse0
- Outcome
- marketable yieldse0
- Qualifier
- under conditions of high disease pressuree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduction of disease in susceptible cultivars may not be adequate to produce marketable yields under conditions of high disease pressure”
t0“Wheat”
Claim · model-written summary
Reduced visual head blight symptoms generally coincided with reduced yield loss, DON concentration and damaged kernels.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- fungicidee0
- Outcome
- yield loss, DON concentration, and FDK reactione0
- Direction
- decreasese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In most cases, if a fungicide reduced FHB visual symptoms, similar decreases were detected in yield loss, DON concentration, and FDK reaction”
t0“Wheat”
Claim · model-written summary
Azoxystrobin increased DON contamination in the more susceptible cultivar in 1998 relative to the Fusarium check.
- Taxon
- WheatTriticum aestivumt0
- Material
- more susceptible cultivare0
- Treatment
- azoxystrobine0
- Outcome
- DON contaminatione0
- Direction
- increasee0
- Comparator
- Fusarium checke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1998, an increase in DON contamination compared with the Fusarium check was observed with azoxystrobin and carbendazim on the more susceptible cultivar”
t0“Wheat”
Claim · model-written summary
Carbendazim increased DON contamination in the more susceptible cultivar in 1998 relative to the Fusarium check.
- Taxon
- WheatTriticum aestivumt0
- Material
- more susceptible cultivare0
- Treatment
- carbendazime0
- Outcome
- DON contaminatione0
- Direction
- increasee0
- Comparator
- Fusarium checke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1998, an increase in DON contamination compared with the Fusarium check was observed with azoxystrobin and carbendazim on the more susceptible cultivar”
t0“Wheat”
Claim · model-written summary
The authors call for research on DON increases associated with some fungicides.
- Taxon
- WheatTriticum aestivumt0
- Outcome
- additional researche0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This increase in DON with some fungicide requires additional research”
t0“Wheat”
Claim · model-written summary
The authors recommend work on resistant cultivars, spraying technology and more effective fungicides.
- Taxon
- WheatTriticum aestivumt0
- Outcome
- more resistant cultivars, better spraying technology, and more effective fungicidese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Research to develop more resistant cultivars, better spraying technology, and more effective fungicides is also needed”
t0“Wheat”
The same questions in other papers
azoxystrobin · disease · Triticum aestivum (wheat)Positive and negative results
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See all 20 papers →tebuconazole · disease · Triticum aestivum (wheat)Results agree
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See all 36 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.