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Claim · model-written summary
Every resistant A. rabiei isolate carried the G143A mutation in cytochrome b.
- Taxon
- A. rabiei
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Ascochyta rabieie0 - Gene
- cytochrome b genee0
- Outcome
- G143A mutatione0
Verbatim
e0“all resistant A. rabiei isolates carried the G143A mutation in the cytochrome b gene”
Title
FUNGICIDE RESISTANCE IN ASCOCHYTA RABIEI IN THE PACIFIC NORTHWEST
Zvenigorodsky, Alexandra Washington State University 2025. doi:10.7273/000008003
Other claims from this paper (12)
- Observation Contemporary Ascochyta rabiei isolates had 331-fold lower sensitivity to azoxystrobin than historic isolates.
- Observation Contemporary Ascochyta rabiei isolates had 978-fold lower sensitivity to pyraclostrobin than historic isolates.
- Observation No isolates had intermediate germination values at the discriminatory dose.
- Observation All isolates collected in 2020 and 2022 had greater than 60% conidial germination, indicating widespread QoI resistance.
- Intervention effect Resistant isolates caused significantly more Ascochyta blight on azoxystrobin-treated chickpea plants.
- Intervention effect Azoxystrobin at 100 μg/ml failed to control blight caused by QoI-resistant isolates.
- Observation Fluxapyroxad sensitivity had low EC50 values between 0.0092 and 0.0795 μg/ml.
- Observation Mefentrifluconazole sensitivity had low EC50 values between 0.0115 and 0.0913 μg/ml.
- Observation Sensitivity to fluxapyroxad did not significantly decrease between historic and contemporary isolates.
- Observation Sensitivity to mefentrifluconazole did not significantly decrease between historic and contemporary isolates.
- Recommendation The authors concluded that the two tested QoI fungicides may no longer be effective against A. rabiei in the Pacific Northwest.
- Recommendation The authors concluded that SDHI and DMI fungicides remain viable options for disease management.