Vector infectivity as an aid to forecasting barley yellow dwarf virus incidence
1990
Plumb, R.T. | Lennon, E.A. | Gutteridge, R.A. (Rothamsted Experimental Station, Harpenden (UK))
Although aphids are essential for virus transmission, the number of aphids caught in suction traps or on crops is not always directly correlated with the risk of virus infection. This is especially true in autumn when a large portion of the migrant population is male or gynoparae. In the UK we have supplemented the raw aphid data by measuring the infectivity index representing the risk of infection of BYDV. A threshold value has been determined that gives a reliable guide to virus infection locally to Rothamsted and has been adopted elsewhere to aid decisions on the need to use insecticidal control measures. Alternatively, serological methods of detecting virus in aphids have been tried, but the relationship between these tests and infectivity is not yet clear enough for such methods to be used instead of the biological tests.
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