Estimating potential crop colonization by barley yellow dwarf virus vectors from suction trap
1990
Carter, N. | Tatchell, G.M. (Rothamsted Experimental Station, Harpenden (UK))
In England barley yellow dwarf virus (BYDV) is a problem associated mainly with autumn-sown cereals. The total number of two important vector species, Rhopalosiphum padi (L.) and Sitobion avenae (Fabricius), often differ greatly in suction trap samples in autumn. Three alate morphs of the dioecious R. padi are present in autumn, but only alate exules will colonize cereals, while gynoparae and males are in search of the primary host, Prunus padus L. In contrast, all alate morphs of the monoecious S. avenae will colonize cereals. Hence, differences in densities on crops, at this time, are usually much less pronounced. Host plant choice trials of female R. padi alatae trapped alive indicated that, at Rothamsted, alate exules were largely replaced by gynoparae during the first half of September. R. padi alate exules, the morph that spreads BYDV in crops, therefore forms only a small proportion of the total R. padi migrants in autumn. The relative proportions of R. padi alate exules to S. avenae alatae, in suction trap samples in autumn, were similar to the proportions found on crops.
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