Claim · model-written summary
Alternaria leaf spot resembles bacterial leaf spot and challenges diagnosis.
- Taxon
- cilantro
Coriandrum sativumt0 - Interactor
- Pseudomonas syringae
Pseudomonas syringaee0pathogen - Outcome
- diagnostic challengese0
Not reportedMaterialGeneCompoundOrgan / stageSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alternaria leaf spot also creates diagnostic challenges because symptoms are similar to common bacterial leaf spot caused by Pseudomonas syringae”
t0“First Report of Leaf Blight of Cilantro, Coriandrum sativum, Caused by Alternaria poonensis in the United States”
Title
A. E. Nguyen; B. A. Rodriguez; K. J. Zizzo; et al. Plant Disease 2025. doi:10.1094/pdis-11-24-2501-pdn
Other claims from this paper (18)
- Observation Leaf blight occurred in two Ventura County commercial cilantro fields in 2014.
- Observation Symptoms developed from water soaked lesions into necrosis across entire leaves.
- Observation Six nearby fields were affected the next year.
- Observation Disease incidence was estimated at 15 to 50%, making symptomatic cilantro unmarketable.
- Observation The disease was observed in two Monterey County fields in 2017.
- Observation Cilantro isolates made light gray colonies and maroon pigment on PDA.
- Observation A. dauci isolates made light gray colonies and violet pigment.
- Observation Cilantro isolates had mean conidial dimensions of 57.5 X 20.3 um.
- Observation Cilantro isolate beaks averaged 158 um.
- Intervention effect Cilantro isolates produced 30 to 70% diseased leaf area on cilantro.
- Intervention effect Cilantro isolates produced 0 to 3% diseased leaf area on carrot.
- Intervention effect A. dauci isolates produced 60 to 80% diseased leaf area on carrot.
- Observation Water sprayed controls remained healthy.
- Observation The fungus was reisolated from inoculated cilantro.
- Observation Alt a1 sequences of cilantro isolates had 100% identity and differed by one base pair from A. dauci.
- Observation Calmodulin sequences of cilantro isolates had 100% identity and differed by three base pairs from A. dauci.
- Observation This is the first US report of A. poonensis on cilantro.
- Observation The disease limits cilantro production.