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|a 10.1094/PDIS-06-16-0859-RE
|2 doi
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|a eng
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| 100 |
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|a Lopes, Silvio A
|e verfasserin
|4 aut
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|a Seasonal Variation of 'Candidatus Liberibacter asiaticus' Titers in New Shoots of Citrus in Distinct Environments
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|c 2017
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|a Text
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Revised 20.11.2019
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a The major citrus area of Brazil occupies near 450,000 ha between the Triângulo Mineiro (TM) region of Minas Gerais State and the south of São Paulo State (SPS). Significant climatic variation occurs between regions which could affect huanglongbing (HLB) progress, which is lower in TM. To investigate this possibility, young sweet orange shoots were sampled periodically over 2 years to determine 'Candidatus Liberibacter asiaticus' titers in naturally infected trees in orchards in Analândia, central SPS, and Frutal and Comendador Gomes, within TM. Data-loggers recorded local temperature and relative humidity hourly. In the laboratory, five 'Ca. L. asiaticus'-free Diaphorina citri adults were placed on each sampled shoot for 48 h to feed and acquire the pathogen. Shoots and insects were individually analyzed by quantitative polymerase chain reaction to determine 'Ca. L. asiaticus' titers. The incidence of 'Ca. L. asiaticus'-positive shoots, 'Ca. L. asiaticus' titers, and acquisition rates were lower for shoots from Comendador Gomes than those from Frutal or Analândia. Stronger association was observed between 'Ca. L. asiaticus' titers and the number of hours below 15°C (h < 15°C) or above 30°C (h > 30°C), and cumulative rainfall registered during the 15 days prior to sampling of shoots on each occasion. 'Ca. L. asiaticus' titers associated positively with h < 15°C and rainfall and negatively with h > 30°C. The slower spread and lower incidence of HLB in TM may be related to lower incidences of 'Ca. L. asiaticus'-positive young shoots and lower titers of 'Ca. L. asiaticus' in the same shoots as a consequence of the warmer and drier conditions
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|a Journal Article
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1 |
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|a Luiz, Fernanda Q B F
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Oliveira, Hermes T
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Cifuentes-Arenas, Juan C
|e verfasserin
|4 aut
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| 700 |
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|a Raiol-Junior, Laudecir L
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Plant disease
|d 1997
|g 101(2017), 4 vom: 24. Apr., Seite 583-590
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|x 0191-2917
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|g volume:101
|g year:2017
|g number:4
|g day:24
|g month:04
|g pages:583-590
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|u http://dx.doi.org/10.1094/PDIS-06-16-0859-RE
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