Co-Authors:
Zimmerman-Gries, S., Virus Research Division, Volcani Institute of Agricultural Research, Rehovot, Israel, Department of Entomology, Hebrew University, Faculty of Agriculture, Rehovot, Israel
Harpaz, I., Virus Research Division, Volcani Institute of Agricultural Research, Rehovot, Israel, Department of Entomology, Hebrew University, Faculty of Agriculture, Rehovot, Israel
Abstract:
Test of field spread of potato virus Y (PVY) were carried out in the coastal plain of Israel during the autumn growing seasons of 1964 and 1965. These included twice-weekly samplings of the winged aphid population. PVY-infected tubers of the variety Up-to-Date, were planted at predetermined points in a trial plot, simultaneously with PVY-free ones. Virus spread to progeny was determined by indexing plants grown from tubers that had been collected at different distances from the infector plants. In 1965, a fair correlation was established between the incidence of naturally-spread PVY and distance from the source of inoculum. In 1964, however, the number of aphids trapped were exceptionally high, resulting in a PVY incidence more than double that of 1965 but with practically no apparent relation to the distance from the infector plants. This can be partly explained by the additional infection arising from sources outside the trial plot through the activity of an increased number of vector individuals. © 1967 Kluwer Academic Publishers.
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