RESEARCH ON PELARGONIUM VIRUSES IN SPAIN - I. PRELIMINARY WORK ON VIRUS IDENTIFICATION: HOST RANGE, SEROLOGY, ELECTRON MICROSCOPY AND TISSUE CULTURE
A general characteristic of Pelargonium viruses is their masking by high temperatures (Hollings, 1960a, 1962a; Kivilaan and Scheffer, 1959; Reinert et al., 1963).
The present paper presents evidence on the identification of cucumber mosaic, pelargonium leaf curl and probably a new virus, P2, found infecting Pelargonium plants. The identification was made by host range and electron microscopy. A modified method of tip culture was used to obtain healthy plants.