Saprophytic colonization of citrus twigs by Diaporthe citri and factors affecting pycnidial production and conidial survival
Autor(a) principal: | |
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Data de Publicação: | 2007 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1094/PDIS-91-4-0387 http://hdl.handle.net/11449/38534 |
Resumo: | Melanose, 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. |
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Saprophytic colonization of citrus twigs by Diaporthe citri and factors affecting pycnidial production and conidial survivalPhomopsis citriMelanose, 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.Univ Florida, Ctr Citrus Res & Educ, Dept Plant Pathol, Lake Alfred, FL 33850 USAUniv Politecn Valencia, Inst Agroforestal Mediterraneo, Valencia 46022, SpainSão Paulo State Univ, São Paulo, BrazilSão Paulo State Univ, São Paulo, BrazilAmer Phytopathological SocUniv FloridaUniv Politecn ValenciaUniversidade Estadual Paulista (Unesp)Mondal, S. N.Vicent, A.Reis, R. F.Timmer, L. W.2014-05-20T15:28:47Z2014-05-20T15:28:47Z2007-04-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article387-392http://dx.doi.org/10.1094/PDIS-91-4-0387Plant Disease. St Paul: Amer Phytopathological Soc, v. 91, n. 4, p. 387-392, 2007.0191-2917http://hdl.handle.net/11449/3853410.1094/PDIS-91-4-0387WOS:000245059000008Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengPlant Disease2.9410,575info:eu-repo/semantics/openAccess2021-10-23T10:26:45Zoai:repositorio.unesp.br:11449/38534Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T15:05:08.619488Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Saprophytic colonization of citrus twigs by Diaporthe citri and factors affecting pycnidial production and conidial survival |
title |
Saprophytic colonization of citrus twigs by Diaporthe citri and factors affecting pycnidial production and conidial survival |
spellingShingle |
Saprophytic colonization of citrus twigs by Diaporthe citri and factors affecting pycnidial production and conidial survival Mondal, S. N. Phomopsis citri |
title_short |
Saprophytic colonization of citrus twigs by Diaporthe citri and factors affecting pycnidial production and conidial survival |
title_full |
Saprophytic colonization of citrus twigs by Diaporthe citri and factors affecting pycnidial production and conidial survival |
title_fullStr |
Saprophytic colonization of citrus twigs by Diaporthe citri and factors affecting pycnidial production and conidial survival |
title_full_unstemmed |
Saprophytic colonization of citrus twigs by Diaporthe citri and factors affecting pycnidial production and conidial survival |
title_sort |
Saprophytic colonization of citrus twigs by Diaporthe citri and factors affecting pycnidial production and conidial survival |
author |
Mondal, S. N. |
author_facet |
Mondal, S. N. Vicent, A. Reis, R. F. Timmer, L. W. |
author_role |
author |
author2 |
Vicent, A. Reis, R. F. Timmer, L. W. |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Univ Florida Univ Politecn Valencia Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Mondal, S. N. Vicent, A. Reis, R. F. Timmer, L. W. |
dc.subject.por.fl_str_mv |
Phomopsis citri |
topic |
Phomopsis citri |
description |
Melanose, 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. |
publishDate |
2007 |
dc.date.none.fl_str_mv |
2007-04-01 2014-05-20T15:28:47Z 2014-05-20T15:28:47Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1094/PDIS-91-4-0387 Plant Disease. St Paul: Amer Phytopathological Soc, v. 91, n. 4, p. 387-392, 2007. 0191-2917 http://hdl.handle.net/11449/38534 10.1094/PDIS-91-4-0387 WOS:000245059000008 |
url |
http://dx.doi.org/10.1094/PDIS-91-4-0387 http://hdl.handle.net/11449/38534 |
identifier_str_mv |
Plant Disease. St Paul: Amer Phytopathological Soc, v. 91, n. 4, p. 387-392, 2007. 0191-2917 10.1094/PDIS-91-4-0387 WOS:000245059000008 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Plant Disease 2.941 0,575 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
387-392 |
dc.publisher.none.fl_str_mv |
Amer Phytopathological Soc |
publisher.none.fl_str_mv |
Amer Phytopathological Soc |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128457014509568 |