Journal article

Publication year: 1995

Pages: 2-15

Journal: Zeitschrift für Pflanzenkrankheiten und Pflanzenschutz = Journal of plant diseases and protection

Volume number: 102

Issue number: 1

ISSN: 0340-8159

Publisher: Ulmer

Abstract: 
Several aphids are described to be found on Humulus lupulus, but the Damson hop aphid Phorodon humuli seems to be the only relevant species in German hops. Its quantitative dominance and its transmission abilities make it the most important vector for the hop viruses HMV, HLV and probably also AHLV, which are transmitted in the non persistent manner. But this finding refers to cultivated hops only. Wild hop used to be only a member of the plant societies of the Populetalia and the host-specific hop aphid therefore was restricted to this type of flora. Ecological parameters like the parasitoid fauna of P. humuli indicate that the hop aphid reached only reduced population-sizes not allowing the evolution of specific and effective antagonists. But the unspecific antagonists are not able to control the hop aphid in cultivated hops which therefore is present as a virus vector in most of the hop growing areas worldwide. All morphs, including those not adapted to hop, were shown to transmit the hop-carlaviruses but in some cases with low efficiency, which might be due to the experimental conditions. But Myzus persicae was much more efficient under the same conditions. This and probably other less specific species might have been responsible for the introduction of virus into cultivated hops, as for the hop aphid with its restricted host range, virus acquisition from other species than hops seems to be rather unlikely. High numbers of hop plants in cultivated hops and resulting high population densities of the hop aphid accompanied by the all over presence of infected hop plants give the best premises for a successful virus transmission.

Harvard Citation style: EPPLER, A. (1995) ECOLOGY OF APHIDS ON HOPS AND ITS SIGNIFICANCE ON SPREAD OF HOP VIRUSES, Zeitschrift für Pflanzenkrankheiten und Pflanzenschutz = Journal of plant diseases and protection, 102(1), pp. 2-15

APA Citation style: EPPLER, A. (1995). ECOLOGY OF APHIDS ON HOPS AND ITS SIGNIFICANCE ON SPREAD OF HOP VIRUSES. Zeitschrift für Pflanzenkrankheiten und Pflanzenschutz = Journal of plant diseases and protection. 102(1), 2-15.