Maize, a natural and experimental host of barley yellow dwarf virus in Northern Italy
1990
Refatti, E. | Loi, N. (Universita degli Studi di Udine, Udine (Italy)) | Lorenzoni, C. (Universita Cattolica, Piacenza (Italy)) | Snidaro, M. (Centro Regionale per la Sperimentazione Agraria per Friuli-Venezia Giulia, Pozzuolo (Italy)) | Carraro, L. (Universita degli Studi di Udine, Udine (Italy))
During recent years a gradual increase in maize (Zea mays L.) plants showing barley yellow dwarf virus (BYDV) symptoms has been noticed in northern Italy, mainly in late-sown crops. Severe damage was observed in some inbred lines, sometimes causing a total crop loss. Results obtained by surveys using enzyme-linked immunosorbent assay (ELISA) and by aphid transmissions confirmed that an isolate of BYDV (M-PAV) is the agent inducing the described symptoms. Rhopalosiphum padi (L.) is the most efficient vector of the M-PAV isolate, which is also transmissible by Sitobion avenae (Fabricius) and by Metopolophium dirhodum (Walker). Transmissions with R. padi proved that there are maize lines that show BYD symptoms both in the greenhouse and in the field; other lines only show symptoms in the field, and yet other lines never develop symptoms. Symptomless plants were also detected by ELISA among maize inbred lines and hybrids with natural infection. The possible role of maize in the epidemiology of BYD is considered. In particular it was observed that maize is an excellent autumn host for aphids, especially for R. padi. The percentage of R. padi collected at random from maize plants in five localities that transmitted BYDV ranged from 0.5 to 7 %
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