Data/hora: 09/06/2024 12:29:22

Provedor de dados: | 102
País: | Brazil
Título: | Geostical analysis of spatial dynamics of Citrus Variegated Chlorossis
Autores: | ROBERTO,SÉRGIO R.; FARIAS,PAULO R. S.; BERGAMIN FILHO,ARMANDO.
Data: | 2002-11-01
Ano: | 2002
Palavras-chave: | CVC; Xylella fastidiosa; Epidemiology.
Resumo: | 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 created to better visualize the distribution of the disease. The spherical model was the best fit for the data in this study. Kriging maps also revealed that the incidence of CVC increased in periods during which the trees underwent vegetative growth, coinciding with greater expected occurrence of insect vectors of the bacterium in the field.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582002000600007
Editor: | Sociedade Brasileira de Fitopatologia
Relação: | 10.1590/S0100-41582002000600007
Formato: | text/html
Fonte: | Fitopatologia Brasileira  v.27 n.6 2002
Fonte: | info:eu-repo/semantics/openAccess