First findings of plum pox virus in walnut trees (Juglans Regia L.)

Plum pox virus (PPV) was transmitted from infected buds and leaves of walnut tree (Juglans regia L.) on the following herbaceous indicators: Chenopodium foetidum Schrad., Nicotiana bigelovii var. quadrivalvis Fuchs., N. clevelandii x N. glutinosa. A positive ELISA reaction with antisera against PPV was obtained from infected buds and leaves of Juglans regia L. and from attacked leaves of indicator plants.