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| Registros recuperados: 316 | |
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| Araújo,Alderi E; Maffia,Luiz A; Mizubuti,Eduardo S. G; Alfenas,Acelino C; Capdeville,Guy de; Grossi,José A. S. |
| Botrytis blight caused by Botrytis cinerea is an important disease of rose (Rosa hybrida) grown in greenhouses in Brazil. As little is known regarding the disease epidemiology under greenhouse conditions, pathogen survival in crop debris and as sclerotia was evaluated. Polyethylene bags with petals, leaves, or stem sections artificially infected with B. cinerea were mixed with crop debris in rose beds, in a commercial plastic greenhouse. High percentage of plant parts with sporulation was detected until 60 days, then sporulation decreased on petals after 120 days, and sharply decreased on stems or leaves after 90 days. Sporulation on petals continued for 360 days, but was not observed on stems after 150 days or leaves after 240 days. Although the fungus... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rosa hybrida; Botrytis blight; Epidemiology; Management. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582005000500009 |
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| ROBERTO,SÉRGIO R.; FARIAS,PAULO R. S.; BERGAMIN FILHO,ARMANDO. |
| The spatial dynamics of Citrus Variegated Chlorosis (CVC) was studied in a five-year old commercial orchard of 'Valencia' sweet orange (Citrus sp.) trees, located in the northern region of the state of São Paulo, Brazil. One thousand trees were assessed in 25 rows of 40 trees, planted at 8 x 5 m spacing. Disease incidence data were taken beginning in March 1994 and ending in January 1996, at intervals of four to five months. Disease aggregation was observed through the dispersion index analysis (Ib), which was calculated by dividing the area into quadrants. CVC spatial dynamics was examined using semivariogram analysis, which revealed that the disease was aggregated in the field forming foci of 10 to 14 m. For each well-fitted model, a kriging map was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: CVC; Xylella fastidiosa; Epidemiology. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582002000600007 |
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| Oliveira,Andréia M. R.; Duarte,Valmir; Silveira,José R. P.; Moraes,Marcelo G.. |
| Erwinia carotovora subsp. atroseptica (Eca), E. carotovora subsp. carotovora (Ecc) and E. chrysanthemi (Ech) may cause potato (Solanum tuberosum) blackleg. To determine the occurrence of these pathogens in the conditions found in the State of Rio Grande do Sul (RS), potato plants showing blackleg symptoms were harvested from 22 fields in nine counties in Serra do Nordeste, Planalto, Depressão Central, and Grandes Lagoas, from September to December of 1999 (Spring-Summer season). Green pepper (Capsicum annuum) fruits were used as a host to enrich for pectolytic erwinia from potato stems with blackleg symptoms. Bacteria were subsequently isolated on non-selective medium. Isolates that were Gram-negative, facultatively anaerobic, and pitted... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Erwinia carotovora subsp. atroseptica; E. carotovora subsp. carotovora; Erwinia chrysanthemi; Epidemiology; Solanum tuberosum; Soft rot. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582003000100007 |
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| FAJARDO,THOR V. M.; NISHIJIMA,MARTA; BUSO,JOSÉ A.; TORRES,ANTÔNIO C.; ÁVILA,ANTÔNIO C.; RESENDE,RENATO O.. |
| Garlic viruses often occur in complex infections in nature. In this study, a garlic virus complex, collected in fields in Brazil, was purified. RT-PCR was performed using specific primers designed from the consensus regions of the coat protein genes of Onion yellow dwarf virus, a garlic strain (OYDV-G) and Leek yellow stripe virus (LYSV). cDNA of Garlic common latent virus (GCLV) was synthesized using oligo-dT and random primers. By these procedures individual garlic virus genomes were isolated and sequenced. The nucleotide sequence analysis associated with serological data reveals the presence of two Potyvirus OYDV-G and LYSV, and GCLV, a Carlavirus, simultaneously infecting garlic plants. Deduced amino acid sequences of the Brazilian isolates were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: OYDV-G; LYSV; GCLV; Detection; Coat protein; PCR; Probes; Epidemiology. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582001000300007 |
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| SALES,Nathana Izabela Silva; LEÃO,Evelynne Urzêdo; CORREIA,Lucas Caius Moreira do Amaral; SIQUEIRA,Chrystian de Assis; SANTOS,Gil Rodrigues dos. |
| ABSTRACT Rust, caused by Olivea neotectonae, stands out as the main teak disease, causing premature defoliation regardless of the tree’s growth stage. In this study, we aimed to assess the temporal progress of rust in adult teak plants in southern Tocantins State (Brazil). Both rust incidence and severity were evaluated and the disease progress curves were obtained, adjusting to monomolecular, logistic and Gompertz mathematical models. Data from incidence and severity were correlated with climate variables collected by the agrometeorological station located in the study area. Rust incidence reached 100% at 98 days after beginning of the evaluations (DBE). The highest severity (equal or above 75%) was observed at 147 DBE. There was a significant and... |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Epidemiology; Tectona grandis; Olivea neotectonae. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672017000300277 |
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| Oliveira,Bruno Luciano Carneiro Alves de; Silva,Alécia Maria da; Silva,Raimundo Antonio da; Thomaz,Erika Barbara Abreu Fonseca. |
| Aging with quality of life does not occur equally among the racial groups of Brazilian elderly, and few studies have analyzed this issue in the states of the Brazilian Legal Amazon. The objective of this study was to investigate racial inequalities in the socioeconomic, demographic and health conditions of elderly residents of Maranhão state, Brazil. The present work is a cross-sectional study of 450 elders aged 60 years or older included in the 2008 National Household Sample Survey. The prevalence of socioeconomic, demographic, health and habit indicators and of risk factors were estimated in white, brown and black racial categories that were self-reported by the survey participants. The chi-square test was used for comparisons (a=5%). The majority of the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aging; Social inequity; Epidemiology; Indicators; Race or ethnic group distribution. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672014000300006 |
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| Régis-Aranha,Lauramaris de Arruda; Meneghim,Marcelo de Castro; Pereira,Antonio Carlos; Oliveira,Nícia Marques de Almeida; Ambrosano,Gláucia Maria Bovi; Mialhe,Fábio Luiz. |
| Studies have shown that the age of 12 was determined as the age of global monitoring of caries for international comparisons and monitoring of disease trends. The aimed was to evaluate the prevalence of dental caries, fluorosis and periodontal condition and their relation with socioeconomic factors among schoolchildren aged twelve in the city of Manaus, AM. This study with a probabilistic sample of 661 children was conducted, 609 from public and 52 from private schools, in 2008. Dental caries, periodontal condition and dental fluorosis were evaluated. In order to obtain the socioeconomic classification of each child (high, upper middle, middle, lower middle, low and lower low socioeconomic classes), the guardians were given a questionnaire. The mean... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Epidemiology; Periodontal Diseases; DMF index. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672014000300004 |
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| Oliveira, Tiago Mendonça de; Teixeira, Cristina Mara; Pinto, Mariana Olímpia Köhler Marra; Arcebispo, Thiago Luiz Mendes; Soriano-Araújo, Amanda; Cunha, Lucas Maciel; Diniz, Soraia Araújo; Silva, Marcos Xavier. |
| Phthiraptera are lice highly adapted to living as permanent and obligatory ectoparasites of birds and mammals. High infestations by biting lice contribute to the low productivity, loss quality of the eggs, besides weight decrease of chickens. Therefore, this study aimed to evaluate and to characterize the risks involved with the presence of biting lice in laying chicken from Minas Gerais, Brazil, throught a Multiple Correspondence Analysis (MCA). A secondary database with information regarding 402 chicken houses from 42 properties of laying hens from the same region was used and adapted for this study. The variables that composed the correspondence model were selected through Chi-square tests (p ≤ 0.05). A risk index was designed to relate the presence of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Epidemiology; Lice; Laying hens; Risk index; Correspondence analysis. |
| Ano: 2019 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/47474 |
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| Ormeño,Juan; Sepúlveda,Paulina; Rojas,Ricardo; Araya,Jaime E. |
| Plant samples of jimsonweed (Datura stramonium L.) and thornapple (D. ferox L.) were collected to determine the presence of Cucumber mosaic virus (CMV), Alfalfa mosaic virus (AMV), and Potato virus Y (PVY) in Santiago, Chile (33º34 S lat, 70º38 W long, altitude 625 mosl), using double stranded RNA (dsRNA) analysis and ELISA. Both weeds were positive to the three types of virus with a percentage of infection ranging from 20-30% except for PVY infection in D. stramonium with an incidence of 5%. Under controlled conditions, the aphid Myzus persicae (Sulzer) transmitted CMV from D. ferox to tomatoes (Lycopersicon esculentum Mill.) and sweet peppers (Capsicum annuum L.), but did not transfer it to potatoes (Solanum tuberosum L.). Seeds of positive D.... |
| Tipo: Journal article |
Palavras-chave: AMV; CMV; PVY; Epidemiology. |
| Ano: 2006 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072006000400001 |
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| Registros recuperados: 316 | |
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