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Journal Article

Journal article

Spread and infectivity of aphids as carriers of barley yellow dwarf virus in southern England in 1988-1990  [1992]

Tatchell, G.M. (Rothamsted Exoerimental Station, Harpenden, Herfordshire (United Kingdom), AFRC Inst. of Arable Crops Research); Plumb, R.T.;

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The numbers of virus-carrying aphids in suction trap samples in southern England in the autumn seasons of 1988-1990 were generally smaller than average. The measurements of the infectivity of aphids caught at Rothamsted and Broom's Barn showed that, in 1988, only early-sown crops in the Broom's Barn area were at risk from damaging infection. In the spring seasons of 1989 and 1990, on the other hand, infections with BYDV were widespread and severe. The very early detection of the first migrants of Rhopalosiphum padi and Sitobion avenae and of infective aphids indicates that these had overwintered successfully in large numbers and that the reservoir of virus was considerable. These winters were two of the warmest on record. Thus the exceptionally high incidence of BYDV in both winter and spring crops in 1989 and 1990 can be attributed essentially to abnormally warm weather conditions which allowed the few aphids that did infest crops to survive, reproduce, and spread the virus during the winter and spring

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Pflanzenschutz-Nachrichten Bayer (Germany)

ISSN : 0340-1723