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dc.contributor.author
Camiletti, Boris Xavier
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dc.contributor.author
Lichtemberg, Paulo S. F.
dc.contributor.author
Paredes, Juan A.
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Carraro, Thiago A.
dc.contributor.author
Velascos, Jhordan
dc.contributor.author
Michailides, Themis J.
dc.date.available
2022-06-23T17:34:13Z
dc.date.issued
2022-04
dc.identifier.citation
Camiletti, Boris Xavier; Lichtemberg, Paulo S. F.; Paredes, Juan A.; Carraro, Thiago A.; Velascos, Jhordan; et al.; Characterization, pathogenicity, and fungicide sensitivity of Alternaria isolates associated with preharvest fruit drop in California citrus; Elsevier B.V.; Fungal Biology; 126; 4; 4-2022; 277-289
dc.identifier.issn
1878-6146
dc.identifier.uri
http://hdl.handle.net/11336/160391
dc.description.abstract
Alternaria rot has been recently described as an emerging fungal disease of citrus causing significant damage in California groves. A survey was conducted to determine latent infections on fruits, twigs, and leaves and investigate their seasonal patterns during 2019 and 2020. On fruits, latent infections were more associated with the stem end than with the stylar end, except during spring when a significantly high percentage of flowers (86%) had latent infections. Latent infections on twigs varied markedly between years (28% in 2019 and 9.5% in 2020), while Alternaria spp. were also recovered from citrus leaves. Alternaria isolates collected during the survey were identified based on multigene sequence analysis, confirming that Alternaria alternata and Alternaria arborescens are the two species associated with infections of citrus fruits. Of the 23 isolates, 19 were identified as A. alternata and demonstrated the dominance of this species over A. arborescens. Isolates representing populations of these two species were selected as representative isolates for physiological and morphological studies. A. alternata and A. arborescens showed similar conidial dimensions but differed in the number of conidia produced. Growth rates demonstrated that A. alternata grows faster than A. arborescens at all the temperatures evaluated, except at 25 and 35 °C. The growth patterns were similar for both species. The sporulation rate of the Alternaria isolates was influenced differently by temperature. This parameter also influenced conidial germination and appressorium formation, and no significant differences were observed between Alternaria species. Pathogenicity and aggressiveness tests on detached fruit demonstrated the ability of A. alternata and A. arborescens to cause internal lesions and produce fruit drop in the orchards with no quantitative differences between them (disease severity indexes of 58 and 68%, respectively). The fungicide sensitivity tests showed that DMI fungicides are the most effective fungicides in reducing mycelial growth. The SDHI fungicides had intermediate activity against the mycelial growth but also suppressed spore germination. The spore germination assay suggested that some of the isolates included in this study might have some level of resistance to QoI and SDHI fungicides. The findings of this study provide new information about the pathogens associated with the excessive fruit drop recently observed in some California citrus groves.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier B.V.
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
AGGRESSIVENESS
dc.subject
FUNGICIDE RESISTANCE
dc.subject
LATENT INFECTIONS
dc.subject
PHYLOGENETIC ANALYSIS
dc.subject
TEMPERATURE
dc.subject.classification
Agricultura
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dc.subject.classification
Agricultura, Silvicultura y Pesca
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dc.subject.classification
CIENCIAS AGRÍCOLAS
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dc.title
Characterization, pathogenicity, and fungicide sensitivity of Alternaria isolates associated with preharvest fruit drop in California citrus
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2022-06-22T20:12:43Z
dc.journal.volume
126
dc.journal.number
4
dc.journal.pagination
277-289
dc.journal.pais
Reino Unido
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dc.description.fil
Fil: Camiletti, Boris Xavier. University Of California. Kearney Agricultural Research And Extension Center; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; Argentina
dc.description.fil
Fil: Lichtemberg, Paulo S. F.. University Of California. Kearney Agricultural Research And Extension Center; Estados Unidos
dc.description.fil
Fil: Paredes, Juan A.. University Of California. Kearney Agricultural Research And Extension Center; Estados Unidos
dc.description.fil
Fil: Carraro, Thiago A.. University Of California. Kearney Agricultural Research And Extension Center; Estados Unidos
dc.description.fil
Fil: Velascos, Jhordan. University Of California. Kearney Agricultural Research And Extension Center; Estados Unidos
dc.description.fil
Fil: Michailides, Themis J.. University Of California. Kearney Agricultural Research And Extension Center; Estados Unidos
dc.journal.title
Fungal Biology
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.funbio.2022.02.003
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S1878614622000204
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