A model for analysing plant-virus transmission characteristics and epidemic development

• DOI: 10.1093/imammb/15.1.1
• Publication Date: 2004-12-09T12:30:51Z
• Authors: M. Jeger
• Keywords: Basic reproduction number

Most plant viruses are vectored by arthropods, often Homopteran insects. Four general classes of plant-virus diseases have been recognized; they distinguished the transmission characteristics and nature interaction virus with vector. For nonpersistently transmitted viruses, is usually restricted to stylet insect. persistently ingested, passes through gut wall into haemolymph, then moves salivary glands where it can potentially be other plants. Persistently two subclasses termed circulaive if there no multiplication in insect vector propagative is. A fourth class, semipersistent, which intermediate between nonpersistent persistent, generally this class foregut model has developed an SEIR-type epidemic for host linked population (an SEI vertical transmission) describe process. This was used compare four directly, explore consequences development possible control options. Depending on assumptions made about migration, obtain expression basic reproductive number, R0. Expressions were also obtained equilibrium values classes; a numerical analysis indicated that these equilibria stable known or reasonable estimates parameter values. The R0, examine relative contributions key parameters distinguishing disease using ranges taken directly from literature estimated indirectly. Pairwise plots satisfied threshold criterion R0 = 1 clearly separated categories. On holding constant, much larger activity required satisfy viruses. Similar conclusions reached healthy viruliferous populations against parameters. framework analyse effectiveness roguing (the removal destruction) diseased plants and/or reduction vector-population size, example, insecticide treatment vegetation management. Roguing would only effective at relatively low densities. needed very high There clear advantage reducing density measures aimed