[Investigations on the transmission of hop viruses by dodder (Cuscuta)]
1992
Eppler, A. (Justus-Liebig Univ., Giessen (Germany). Inst. fuer Phytopathologie und Angewandte Zoologie)
At least eight species of dodder occur or have occurred in Germany. Some of them are able to settle on hops and one, Cuscuta europaea is even called the hop-dodder. Old reports document a wide spread of dodder in hop fields but no direct damage was observed. On the other hand is dodder able to transmit viruses. In this report the ability of Cuscuta spp. to settle on hops and to transmit hop viruses is proved. From 12 species tested 8 were to a certain extent able to settle on hops. Transmission experiments were only undertaken with two species: C. europaea and C. suaveolens. Neither the carlaviruses hop mosaic, hop latent and American hop latent, nor the ilarviruses apple mosaic and prunus necrotic ringspot virus were transmitted. The nepovirus arabis mosaic was transmitted, but at a very low rate only. Dodder does play no role any more in modern hop culture but it has to be taken into consideration, that the ArMV-infestation of traditional hop cultivars originating from and planted in areas where the natural nematode vector is not present has probably been caused by dodder.
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