Plant Pathology (2019) 68, 72-84

M.A. Macedo, A.K. Inoue-Nagata, T.N.Z. Silva, D.M.S. Freitas, J.A.M. Rezende, J.C. Barbosa, M. Michereff-Filho, A.R. Nascimento, A.L. Lourenção and A. Bergamin Filho (2019)
Temporal and spatial progress of the diseases caused by the crinivirus Tomato chlorosis virus and the begomovirus Tomato severe rugose virus in tomatoes in Brazil
Plant Pathology 68 (1), 72-84
Abstract: Efficient management of whitefly-borne diseases remains a challenge due to the lack of a comprehensive understanding of their epidemiology, particularly of the diseases tomato golden mosaic and tomato yellowing. Here, by monitoring 16 plots in four commercial fields, the temporal and spatial distribution of these two diseases were studied in tomato fields in Brazil. In the experimental plots these diseases were caused by tomato severe rugose virus (ToSRV) and tomato chlorosis virus (ToCV), respectively. The incidence of each virus was similar in the plots within a field but varied greatly among fields. Plants with symptoms for both diseases were randomly distributed in three of four spatial analyses. The curves representing the progress of both diseases were similar and contained small fluctuations, indicating that the spread of both viruses was similar under field conditions. In transmission experiments of ToSRV and ToCV by Bemisia tabaci MEAM1 (former biotype B), these viruses had a similar transmission rate in single or mixed infections. It was then shown that primary and secondary spread of ToCV were not efficiently controlled by insecticide applications. Finally, in a typical monomolecular model of disease progress, simulation of the primary dissemination of ToSRV and ToCV showed that infected plants were predominantly randomly distributed. It is concluded that, although the manner of vector transmission differs between ToSRV (persistent) and ToCV (semipersistent), the main dispersal mechanisms are most probably similar for these two diseases: primary spread is the predominant mechanism, and epidemics of these diseases have been caused by several influxes of viruliferous whiteflies.
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Link to article at publishers website
Database assignments for author(s): Alice Kazuko Inoue-Nagata, Jorge A.M. Rezende, André Luiz Lourencao

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology
transmission/dispersal of plant diseases

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Bemisia tabaci biotype MEAM1	Tomato (Solanum lycopersicum)	Brazil (south)
	Tomato chlorosis virus	Tomato (Solanum lycopersicum)	Brazil (south)
	Tomato severe rugose virus	Tomato (Solanum lycopersicum)	Brazil (south)