969 resultados para CITRUS PSYLLID


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This work was done to determine the maximum amount of liquid that the citrus leaves can hold back and compare alternative methods for estimating leaf area with the standard method of integrating electronic image. The alternative methods were leaf mirroring on paper and leaf digitalization and imagine analyzes. The spray retention capacity was evaluated with mitecide sprayed with cyhexatin (Sipcatin 500 CS) plus the treatments: combination of two adjuvants (mineral oil - Assist and vegetable oil - Veget'Oil) and two concentrations (10 and 15 mL of adjuvant L-1). The methods for estimating leaf area assessed do not differ between them. The maximum retention of liquids for the leaf occurred when vegetable oil in the application was used.

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The aim of the present study was to analyse the genetic and pathogenic variability of Colletotrichum spp. isolates from various organs and cultivars of mango with anthracnose symptoms, collected from different municipalities of São Paulo State, Brazil. Colletotrichum gloeosporioides isolates from symptomless citrus leaves and C. acutatum isolates from citrus flowers with post-bloom fruit drop symptoms were included as controls. Sequencing of the ITS region allowed the identification of 183 C. gloeosporioides isolates from mango; only one isolate was identified as C. acutatum. amova analysis of ITS sequences showed larger genetic variability among isolates from the same municipality than among those from different populations. fAFLP markers indicated high levels of genetic variability among the C. gloeosporioides isolates from mango and no correlation between genetic variability and isolate source. Only one C. gloeosporioides mango isolate had the same genotype as the C. gloeosporioides isolates from citrus leaves, as determined by ITS sequencing and fAFLP analysis. Pathogenicity tests revealed that C. gloeosporioides and C. acutatum isolates from either mango or citrus can cause anthracnose symptoms on leaves of mango cvs Palmer and Tommy Atkins and blossom blight symptoms in citrus flowers. These outcomes indicate a lack of host specificity of the Colletotrichum species and suggest the possibility of host migration. © 2012 British Society for Plant Pathology.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Pós-graduação em Ciências Biológicas (Biologia Celular e Molecular) - IBRC

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Pós-graduação em Ciências Biológicas (Biologia Celular e Molecular) - IBRC

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Pós-graduação em Ciências Biológicas (Microbiologia Aplicada) - IBRC

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Pós-graduação em Agronomia (Ciência do Solo) - FCAV

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Pós-graduação em Alimentos e Nutrição - FCFAR

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Pós-graduação em Alimentos e Nutrição - FCFAR

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)