 | PREFACE (F.A. Hakkaart, H.H.van der Borg) |
| VIROLOGISTS AND ORNAMENTALISTS (P.K. Schenk) |
| TULIP BREAKING VIRUS, THE ONLY CAUSE OF 'BROWN RING FORMATION' IN LILIUM MID-CENTURY HYBRID 'ENCHANTMENT' (A.F.L.M. Derks) |
| CONTROL OF THE SPREAD OF TWO NON-PERSISTENT APHID-BORNE VIRUSES IN LILIES (W.P. Mowat, J.A.T. Woodford) |
| A FURTHER SIMPLIFIED SINGLE IMMUNODIFFUSION DROP TEST FOR THE DETECTION OF LILY SYMPTOMLESS VIRUS IN LILIUM SPECIES (D.H.M. van Glogteren, A.F.L.M. Derks, Gerry J. Blom, M. H. Bunt, Jenny A. Vink) |
| RATE OF INFECTION OF VIRUS-FREE LILIES WITH LILY SYMPTOMLESS VIRUS IN THE FIELD (T.C. Allen, R.G. Linderman) |
| TRANSMISSION EXPERIMENTS WITH AN ISOLATE OF BEAN YELLOW MOSAIC VIRUS FROM GLADIOLUS NANUS - ACTIVATION OF THE INFECTIVITY FOR VICIA FABA BY A PREVIOUS PASSAGE ON THIS HOST (R. Koenig) |
| PURIFICATION OF CARNATION ETCHED RING VIRUS AND COMPARATIVE PROPERTIES OF CERV AND CAULIFLOWER MOSAIC VIRUS NUCLEIC ACIDS (R.H. Lawson, E.L. Civerolo) |
| CARNATION VIRUSES IN NEW ZEALAND (P.R. Bennet, K.S. Milne) |
| POSSIBILITIES OF IMPROVING DETECTION OF CHRYSANTHEMUM STUNT AND OBTENTION OF VIROID-FREE PLANTS BY MERISTEM-TIP CULTURE (J.C. Bachelier, M. Monsion, J. Dunez) |
| VIRUS DISEASES AND TISSUE CULTURE OF SOME SOUTH AFRICAN FLOWER BULBS (P.J. Klesser, D.D. Nel) |
| SOME VIRUS DISEASES IN NARCISSI (C.J. Asjes, L. Ch. Segers) |
| NARCISSUS TIP NECROSIS VIRUS (W.P. Mowat, C.J. Asjes, A.A. Brunt) |
| TWO POTEXVIRUSES IN NERINE (D.Z. Maat) |
| VIRUS DISEASES OF SOME ORNAMENTAL AND INDIGENOUS TREES AND SHRUBS IN BRITAIN (J.B. Sweet) |
| ASSOCIATION OF VIRUS PARTICLES WITH A DISEASE OF RHODODENDRON (D.L. Coyier, T.C. Allen, R. Stace-Smith, E. Leung) |
| A COMPARATIVE STUDY OF DAPHNE VIRUSES X, S AND Y (K.S. Milne, R.L. Forster) |
| ALFALFA MOSAIC VIRUS ISOLATED FROM RHAMNUS FRANGULA IN ITALY (F. Marani, L. Giunchedi) |
| OBSERVATIONS ON LILAC RINGSPOT (F.A. van der Meer) |
| Article 19 (R.K. Horst, S.H. Smith, H.T. Horst, W.A. Oglevee) |
| PROPAGATION OF PELARGONIUM VARIETIES BY STEM-TIP CULTURE (G. Hamdorf) |
| Article 21 (R.H. Lawson, S.S. Hearon, F.F. Smith) |
| EUPHORBIA RINGSPOT VIRUS, A NEW VIRUS IN EUPHORBIA MILII X LOPHOGONA (O. Bode, D.E. Lesemann) |
| A MOSAIC DISEASE OF PRIMULA OBCONICA CAUSED BY A POTYVIRUS (V. Lisa, O. Lovisolo) |
| A VIRUS DISEASE OF DIEFFENBACHIA 'EXOTICA' (F.A. Hakkaart, H.A.J.I. Waterreus) |
