Asclepias-syriaca-L (Common Milkweed), A New Natural Host of Cucumber Mosaic Virus in Hungary and Yugoslavia

Salamon, P and Horváth, József and Mamula, D and Juretic, N and Hunyadi, K (1989) Asclepias-syriaca-L (Common Milkweed), A New Natural Host of Cucumber Mosaic Virus in Hungary and Yugoslavia. ACTA PHYTOPATHOLOGICA ET ENTOMOLOGICA HUNGARICA, 24 (3-4). pp. 363-373. ISSN 0238-1249

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Abstract

Cucumber mosaic virus (CMV) was isolated in Hungary and Yugoslavia from wild-growing Asclepias syriaca L. (common milkweed) plants showing mosaic, veinclearing, line-pattern or mosaic symptoms. 5-35 per cent of the individuals were found to be affected in different places. Three isolates of CMV (Asc/B76 and Asc/H from Hungary as well as Asc/Y from Yugoslavia) were identified on the basis of reactions of test plants and by agar-gel double diffusion serological tests using antisera to CMV. The isolate Asc/B76 was also characterized by host range, serological comparison with the To and D serotypes of CMV as well as by particle morphology, aphid transmission, cross protection tests and physical properties in plant extract. Based on these results, this isolate was classified within the To serotype (B pathotype) of CMV. Preliminary studies revealed that the Asc/H and Asc/Y isolates of CMV differ from the CMV/B76 by infecting some leguminous species (e.g. Vigna sinensis) systemically. Asclepias syriaca as a perennial plant plays an important role in the maintenance and infection chain of CMV in the Carpatic Basin.

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