Identification of Phytophthora cryptogea as the Cause of Rapid Decline of Petunia (Petunia x hybrida) in Chile

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dc.contributor.authorAmpuero, J.
dc.contributor.authorLatorre, B. A.
dc.contributor.authorTorres, R.
dc.contributor.authorChavez, E. R.
dc.date.accessioned2024-01-10T12:39:32Z
dc.date.available2024-01-10T12:39:32Z
dc.date.issued2008
dc.description.abstractPhytophthora cryptogea was consistently isolated from diseased tissue taken from the crown and necrotic roots of grandiflora type petunia (Petunia x hybrida) that were collected in gardens in five Public parks in Santiago. Chile in 2004 and 2005. Symptoms included leaf wilting and foliar chlorosis. followed by partial necrosis. and extensive dark-brown to reddish cankers in the crown. Disease incidence was over 50% and infected plants died within 7 to 10 days after transplanting. This pathogen was identified oil the basis of colony morphology. morphological characterization of the sexual and asexual reproductive structures, and temperature range. The identification of Phytophthora cryptogea was further corroborated by the internal transcribed spacer sequence analysis (GenBank accession number EF093534). Isolates of P cryptogea were pathogenic oil 10-week-old white grandiflora petunia plants that were inoculated on the roots or on the crown using mycelium fragments, or via soil inoculation using zoospores. A rapid decline was observed after soil inoculation,, with zoospores. Root fresh weight decreased significantly and the root rot index and severity of foliage symptoms increased significantly (P <= 0.051), relative to noninoculated plains after 14 days Of incubation. Two isolates (Ph-1 and Ph-2) were pathogenic oil bell pepper and one isolate (Ph-1) was pathogenic oil tomato after root inoculation. Two isolates (Ph-2 and Ph-3) were pathogenic oil the fruit of avocado, bell pepper. cherry tomato. Cucumber. kiwifruit, lemon. pear. pepino, and potato tubers, demonstrating the pathogen's ability to cause postharvest infection of fruit of a wide range of host plants. The efficacy of mefenoxam at 0.1 mg/ml mixed with either chlorothalonil at 1.0 mg/ml or mancozeb at 1.6 mg/ml was demonstrated in this study. whereas chlorothalonil and mancozeb alone did not control disease development. No significant differences were obtained between foliage and soil drench applications,. This study demonstrated that P. cryptogea is the cause of the rapid decline found on petunia in Santiago. Chile and, to our knowledge. this is the first report giving a detailed description of a disease caused by P. cryptogea on petunia.
dc.fechaingreso.objetodigital2024-04-30
dc.format.extent8 páginas
dc.fuente.origenWOS
dc.identifier.doi10.1094/PDIS-92-11-1529
dc.identifier.issn0191-2917
dc.identifier.pubmedidMEDLINE:30764445
dc.identifier.urihttps://doi.org/10.1094/PDIS-92-11-1529
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/77205
dc.identifier.wosidWOS:000260226800009
dc.information.autorucAgronomía e Ing. Forestal;Ampuero J;S/I;146623
dc.information.autorucAgronomía e Ing. Forestal;Latorre B;S/I;98977
dc.issue.numero11
dc.language.isoen
dc.nota.accesocontenido parcial
dc.pagina.final1536
dc.pagina.inicio1529
dc.publisherAMER PHYTOPATHOLOGICAL SOC
dc.revistaPLANT DISEASE
dc.rightsacceso restringido
dc.subjectfungicides
dc.subjectoomycetes
dc.subjectROOT-ROT
dc.subjectCROWN ROT
dc.subjectFLORICULTURE CROPS
dc.subjectSPP.
dc.subjectSOIL
dc.subjectDRECHSLERI
dc.subjectFUNGICIDES
dc.subjectKIWIFRUIT
dc.subjectCAPSICI
dc.subjectPEPPER
dc.titleIdentification of Phytophthora cryptogea as the Cause of Rapid Decline of Petunia (Petunia x hybrida) in Chile
dc.typeartículo
dc.volumen92
sipa.codpersvinculados146623
sipa.codpersvinculados98977
sipa.indexWOS
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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