Saprophytic colonization of citrus twigs by Diaporthe citri and factors affecting pycnidial production and conidial survival

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dc.contributor.authorMondal, S. N.
dc.contributor.authorVicent, A.
dc.contributor.authorReis, R. F.
dc.contributor.authorTimmer, L. W.
dc.contributor.institutionUniv Florida
dc.contributor.institutionUniv Politecn Valencia
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:28:47Z
dc.date.available2014-05-20T15:28:47Z
dc.date.issued2007-04-01
dc.description.abstractMelanose, caused by Diaporthe citri, produces reddish brown lesions on the fruit, leaves, and twigs of citrus trees, and greatly reduces the marketability of fresh fruit. Most of the inoculum is produced in pycnidia on dead twigs in the tree canopy, which exude large numbers of conidia in slimy masses. In this study, detached twigs inoculated with conidia were readily colonized and produced large numbers of pycnidia within 30 to 40 days when they were soaked 3 to 4 h on alternate days. Conidial production was measured by wetting twigs in a rain tower periodically and collecting the conidia in the runoff water. Production began after 80 days and continued for nearly 300 days. In other experiments, production of mature pycnidia on detached twigs was greatest at 94 to 100% relative humidity (RH) and at 28 degrees C. Low RH and temperature, however, favored survival of conidia in exuded masses on twigs. In the field, colonization of detached twigs by D. citri was high in rainy season, moderate in spring and early fall, and minimal in late fall and winter. Twig colonization was positively related to the number of rain days and average temperature, but not to total rainfall. In another experiment, inoculated twigs placed in the tree canopy developed pycnidia and then produced conidial masses for about 200 days. D. citri is a serious pathogen, but a weak parasite, that survives primarily by colonization and reproduction on dead twigs.en
dc.description.affiliationUniv Florida, Ctr Citrus Res & Educ, Dept Plant Pathol, Lake Alfred, FL 33850 USA
dc.description.affiliationUniv Politecn Valencia, Inst Agroforestal Mediterraneo, Valencia 46022, Spain
dc.description.affiliationSão Paulo State Univ, São Paulo, Brazil
dc.description.affiliationUnespSão Paulo State Univ, São Paulo, Brazil
dc.format.extent387-392
dc.identifierhttp://dx.doi.org/10.1094/PDIS-91-4-0387
dc.identifier.citationPlant Disease. St Paul: Amer Phytopathological Soc, v. 91, n. 4, p. 387-392, 2007.
dc.identifier.doi10.1094/PDIS-91-4-0387
dc.identifier.issn0191-2917
dc.identifier.urihttp://hdl.handle.net/11449/38534
dc.identifier.wosWOS:000245059000008
dc.language.isoeng
dc.publisherAmer Phytopathological Soc
dc.relation.ispartofPlant Disease
dc.relation.ispartofjcr2.941
dc.relation.ispartofsjr0,575
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.subjectPhomopsis citript
dc.titleSaprophytic colonization of citrus twigs by Diaporthe citri and factors affecting pycnidial production and conidial survivalen
dc.typeArtigo
dcterms.licensehttp://apsjournals.apsnet.org/page/terms.jsp
dcterms.rightsHolderAmer Phytopathological Soc
unesp.author.orcid0000-0002-3848-0631[2]

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