Abstract
A sample of 50 isolates, including 25 each of the 3-acetyldeoxynivalenol and the 15-acetyldeoxynivalenol trichothecene genotype, from a contemporary collection of Fusarium graminearum associated with Fusarium head blight (FHB) of wheat in New York varied in sensitivity to tebuconazole (effective concentration leading to a 50% reduction of mycelial growth [EC 50 ] of 0.28 to 8.09 mg/liter; μ = 1.12 mg/liter) and metconazole (0.05 to 0.86 mg/liter; μ = 0.33). Mean sensitivity did not differ between the trichothecene genotype groups. Isolate Gz448NY11 from Steuben County is the first tebuconazole-resistant field isolate of F. graminearum reported in the Americas and has the lowest sensitivity to tebuconazole (EC 50 = 8.09 mg/liter) documented for this species. Suppression of FHB and deoxynivalenol (DON) following application of a commercial rate of tebuconazole was significantly diminished in plants inoculated with the tebuconazole-resistant isolate compared with those inoculated with a tebuconazole-sensitive isolate well documented for its aggressiveness and toxigenicity on wheat. There was no diminution of FHB and DON suppression with either isolate following application of metconazole. Significantly more individuals of the tebuconazole-resistant isolate were recovered from spikes inoculated with an equal mixture of the two isolates and sprayed with tebuconazole. Future studies are needed on the epidemiology and monitoring of triazole-resistant isolates to understand the risk that fungicide resistance poses to disease management and food security.
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Claims 7
Claim · model-written summary
Fusarium graminearum isolates from New York wheat varied in tebuconazole sensitivity, with EC50 values of 0.28 to 8.09 mg/liter.
- Taxon
- wheat
Triticum aestivumt0 - Interactor
- Fusarium graminearum
_on_Corn_(Zea_mays)_at_Waimea%2C_Hawaii.jpg?width=60)
Fusarium graminearumt0pathogen - Outcome
- sensitivity to tebuconazolee1
- Value
- 0.28 to 8.09 mg/litere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_on_Corn_(Zea_mays)_at_Waimea%2C_Hawaii.jpg?width=500)
Verbatim
e1“varied in sensitivity to tebuconazole (effective concentration leading to a 50% reduction of mycelial growth [EC 50 ] of 0.28 to 8.09 mg/liter; μ = 1.12 mg/liter)”
t0“Fusarium graminearum from New York Wheat”
Claim · model-written summary
Isolate Gz448NY11 from Steuben County is the first tebuconazole-resistant field isolate of F. graminearum reported in the Americas.
- Taxon
- wheatTriticum aestivumt0
- Material
- Gz448NY11e2
- Interactor
- F. graminearumFusarium graminearume2pathogen
- Outcome
- first tebuconazole-resistant field isolatee2
- Setting
- Steuben Countye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Isolate Gz448NY11 from Steuben County is the first tebuconazole-resistant field isolate of F. graminearum reported in the Americas”
t0“Fusarium graminearum from New York Wheat”
Claim · model-written summary
Isolate Gz448NY11 has the lowest tebuconazole sensitivity documented for F. graminearum, with EC50 of 8.09 mg/liter.
- Taxon
- wheatTriticum aestivumt0
- Interactor
- Fusarium graminearumFusarium graminearumt0pathogen
- Outcome
- sensitivity to tebuconazolee3
- Value
- 8.09 mg/litere3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“has the lowest sensitivity to tebuconazole (EC 50 = 8.09 mg/liter) documented for this species”
t0“Fusarium graminearum from New York Wheat”
Claim · model-written summary
Mean tebuconazole sensitivity did not differ between the trichothecene genotype groups.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- Mean sensitivitye4
- Comparator
- trichothecene genotype groupse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Mean sensitivity did not differ between the trichothecene genotype groups”
t0“Fusarium graminearum from New York Wheat”
Claim · model-written summary
FHB and DON suppression by a commercial rate of tebuconazole was significantly diminished in plants inoculated with the resistant isolate compared with the sensitive isolate.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- application of a commercial rate of tebuconazolee5
- Interactor
- Fusarium graminearumFusarium graminearumt0pathogen
- Outcome
- Suppression of FHB and deoxynivalenol (DON)e5
- Direction
- significantly diminishede5
- Comparator
- a tebuconazole-sensitive isolatee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Suppression of FHB and deoxynivalenol (DON) following application of a commercial rate of tebuconazole was significantly diminished in plants inoculated with the tebuconazole-resistant isolate compared with those inoculated with a tebuconazole-sensitive isolate”
t0“Fusarium graminearum from New York Wheat”
Claim · model-written summary
No diminution of FHB and DON suppression occurred with either isolate after metconazole application.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- application of metconazolee6
- Interactor
- Fusarium graminearumFusarium graminearumt0pathogen
- Outcome
- FHB and DON suppressione6
- Direction
- no diminutione6
- Comparator
- either isolatee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“There was no diminution of FHB and DON suppression with either isolate following application of metconazole”
t0“Fusarium graminearum from New York Wheat”
Claim · model-written summary
The tebuconazole-resistant isolate was recovered significantly more often than the sensitive isolate from mixed inoculated spikes sprayed with tebuconazole.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- sprayed with tebuconazolee7
- Interactor
- Fusarium graminearumFusarium graminearumt0pathogen
- Outcome
- individuals of the tebuconazole-resistant isolatee7
- Direction
- Significantly moree7
- Comparator
- an equal mixture of the two isolatese7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“Significantly more individuals of the tebuconazole-resistant isolate were recovered from spikes inoculated with an equal mixture of the two isolates and sprayed with tebuconazole”
t0“Fusarium graminearum from New York Wheat”
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