ISHS Acta Horticulturae 130: XII International Symposium on Fruit Tree Virus Diseases
THE OCCURRENCE AND SOME PROPERTIES OF THREE CARLAVIRUSES INFECTING HOP PLANTS (HUMULUS LUPULUS) IN ENGLAND |
| Authors: | A.N. Adams, D.J. Barbara, M.F. Clark |
| Abstract:
Three viruses with physical and chemical properties typical of the carlavirus group have been isolated from hop plants (Humulus lupulus) in England: hop mosaic virus (HMV), hop latent virus (HLV) and American hop latent virus (AHLV). All three viruses can be transmitted between hop plants in the non- persistent manner by the aphid Phorodon humuli. HMV and HLV are serologically related to each other and to several other carlaviruses whereas AHLV appears to have few relatives within the group. HMV causes conspicuous symptoms in sensitive cultivars but over 90% of English plantings are of tolerant cultivars, most of which are totally infected. HLV and AHLV do not cause apparent symptoms in commercial cultivars in England. HLV occurs in virtually all commercial plants but AHLV has been found only in recent introductions to the variety collection at Wye College, Kent, made from Corvallis, U.S.A. Measures have been taken to eliminate the virus from England. | |
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