Untersuchungen an Viren der Zier- und Wildgehölze: 8. Mitt.: Neue Befunde an Forsythia, Hydrangea und Philadelphus sowie Viren und Virosen an Rhamnus, Centaurea, Galvezia, Cistus, Forestiera, Abeliophyllum, Celastrus, Staphylea und Crambe

Abstract

Summary The following spontaneously appearing combinations of viruses and woody plants not known until now were found: tomato black ring virus in Forsythia intermedia, Forestiera acuminata, Abeliophyllum distichum, and Celastrus orbiculatus; arabis mosaic and tomato black ring viruses in complex in Staphylea trifolia; tobacco rattle virus alone or in complex with arabis mosaic virus in Hydrangea aspera var. strigosa; elm mottle virus in Philadelphus spec; cucumber mosaic virus in Centaurea canariensis var. subexpinnata and C. arbutifolia; cucumber mosaic and broad bean wilt viruses (the latter is identical with nasturtium ringspot virus) in complex in Centaurea canariensis and C. webbiana; broad bean wilt virus in Galvezia speciosa; alfalfa mosaic virus in Cistus populifolius and C. monspeliensis; cabbage black ring virus in Crambe strigosa var. gigantea; an unidentified, only graft-transmissible virus in Rhamnus frangula. New for Europe is the demonstration of cucumber mosaic virus in Rhamnus cathartica. The viruses were transmitted onto herbaceous test plants mechanically, in case of some aphidtransmissible viruses also by vectors and then identified by the aid of antisera. Alfalfa mosaic virus was only detected by direct serological investigations of leaves of diseased Cistus: The syndromes observed on the spontaneously infected woody plants are described. Numerous new experimental hosts of elm mottle and broad bean wilt viruses as well as their reactions are mentioned.