Abstract
Several vineyards in Rías Baixas and one in the Ribeira Sacra (Spain) were monitored and the spatial pattern of leafroll-diseased grapevine was analysed at several dates. Unidimensional aggregation analysis (ordinary runs), bidimensional analysis, and disease gradients analysis were used as methods of study of spatial aspects of epidemics of GLRaV. At very low insect populations the mealybug Planococcus citri transmitted the GLRaV-3 from infected plants to healthy ones planted between them in an experimental plot at Beluso; an initial focus of leafroll-infected grapevines was detected 2 years after planting at the area where the vectors had been located infesting the old plants. Within 8 years some new foci appeared and coalesced, and the incidence reached >80%. In three commercial plots where no vectors were observed, the spatial analysis of the diseased plants showed three different situations. In Meaño, the study of the evolution of the spatial patterns of diseased plants between 1992 and 2005 suggested slow vectorial field transmission of GLRaV-3. In Goián the analysis for only 2 years suggested random distribution; therefore the viruses were arriving with the planting material, but the runs analysis of some lines suggested incipient spread of GLRaV-3. In Portomarín the incidence of both GLRaV-2 and 3 was low and their distribution was random, without any evidence of field spread. These examples of the study of the spatial analysis of leafroll-infected plants may be helpful to determine whether or not spread of the viruses is occurring, and the best control measures to take.
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Acknowledgements
This work was partly funded by grants from the Xunta de Galicia (XUGA200074A93 and PGIDITO3PXIC20001PN), the European Commission (ALVIRUS/SP1.P7), the FEDER and Ministerio de Ciencia y Tecnología (AGL2002-02438), and the Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (RTA2005-00201-C03-03).
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Cabaleiro, C., Couceiro, C., Pereira, S. et al. Spatial analysis of epidemics of Grapevine leafroll associated virus-3 . Eur J Plant Pathol 121, 121–130 (2008). https://doi.org/10.1007/s10658-007-9254-1
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DOI: https://doi.org/10.1007/s10658-007-9254-1