Infection of tomato seed by different strains of tobacco mosaic virus with particular reference to the symptomless mutant MII-16 A. Th. B. Rast OriginalPaper Pages: 223 - 233
Spread and survival of an aggressive and a non-aggressive strain of Ophiostoma ulmi in elms D. M. ElgersmaH. M. Heybroek OriginalPaper Pages: 235 - 240
Direct electron microscopy and serology with plant viruses in leaf material dried and stored over calciumchloride L. BosM. P. Benetti OriginalPaper Pages: 241 - 251
Hyperparasites of Rhizoctonia solani in Dutch potato fields G. JagerA. Ten HoopenH. Velvis OriginalPaper Pages: 253 - 268
Viruses and virus diseases in Dutch bulbous irises (Iris hollandica) in the Netherlands C. J. Asjes OriginalPaper Pages: 269 - 279