Fluctuations in cereal aphids populations on maize (Zea mays) in western France in relation to the epidemiology of barley yellow dwarf virus (BYDV)
1989
Henry, M. (Rennes Univ. (France). Lab. d'Entomologie Fondametale et Appliquee) | Dedryver, C.A.
Aphid counts were made on a maize field over three years (1985-1987) in western France. Metopolophium dirhodum Wlk. and Sitobion avenae F. were present from early June. Numbers were maximal in late July and the species disappeared in August. Rhopalosiphum padi L. numbers fluctuated differentlyl each year. In 1985 and 1986 they were very low in the first part of July, then increased appreciably to the end of August, reaching very high levels in September 1985. In 1987, R. padi colonised the field from July, it reached a maximum in August, but was no longer abundant in September-October. For all three aphid species there was a good correlation between weekly counts on maize and corresponding suction trapping of alates. Percentage of maize infected by barley yellow dwarf virus (BYDV) was also recorded over three years. Levels varied between 20-30 per cent in 1985 and were 0 per cent and 1 per cent in 1986 and 1987 respectively. BYDV infection pathways for maize, together with the role on this crop in the annual cycle of the aphid vector and the virus are discussed
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