Etiology, occurrence and epidemiology of a begomovirus disease in passionflower in the southwest of Bahia
| Autor: | Jorge Alberto Marques Rezende, Gisele Brito Rodrigues, Quelmo Silva de Novaes, Lilian Amorim, Geraldo Gomes Rocha Sobrinho, Tatiana Mituti, Armando Bergamin Filho |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
Veterinary medicine Whitefly medicine.disease_cause Bemisia tabaci 01 natural sciences Passiflora Infestation whitefly medicine Geminiviridae lcsh:Agriculture (General) Passifloraceae Pathogen biology Spots Begomovirus food and beverages 04 agricultural and veterinary sciences biology.organism_classification lcsh:S1-972 Vector (epidemiology) 040103 agronomy & agriculture INSETOS VETORES 0401 agriculture forestry and fisheries 010606 plant biology & botany |
| Zdroj: | Scientia Agricola, Volume: 76, Issue: 4, Pages: 337-343, Published: JUL 2019 Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP Scientia Agricola, Vol 76, Iss 4, Pp 337-343 Scientia Agricola v.76 n.4 2019 Scientia Agrícola |
| ISSN: | 1678-992X |
| DOI: | 10.1590/1678-992x-2017-0272 |
| Popis: | Severe mosaic symptoms, accompanied by yellow spots, abnormally small leaves, fruit malformation and cracking, reduced plant growth, and high levels of whitefly (Bemisia tabaci MEAM1) infestation were observed in passionflower (Passiflora edulis) orchards in southwestern Bahia, Brazil. The aim of this work was to identify the species of begomovirus infecting the passionflowers, its prevalence in southwestern Bahia, and the spatial and temporal dynamics of the disease. Leaf samples from symptomatic plants collected at 57 orchards located in ten counties were evaluated by PCR for begomovirus infection. Complete nucleotide sequences of DNA-A for two isolates revealed 97 % identity with Passionfruit severe leaf distortion virus (PSLDV). The occurrence of PSLDV in 57 orchards was evaluated based on the presence of characteristic disease symptoms. Approximately 235,000 visually assessed plants exhibited symptoms characteristic of begomovirus infection. Epidemiological studies, conducted in two orchards in Dom Basílio County, showed that disease progress was relatively slow until 121 days after transplanting (DAT), but more rapid in the following 35 days, reaching 100 % infected plants by 156 DAT. The exponential model was fitted to the temporal dynamic of the disease for both areas. An aggregated pattern of diseased plants was predominant for almost all evaluations. It is possible that the primary and secondary spread of the pathogen occurred concurrently during the epidemic progression in both areas, especially late in the season. Containment measures to prevent the virus and the vector from spreading to other passionfruit producing areas in Brazil should be implemented. |
| Databáze: | OpenAIRE |
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