Morfologie en parasitair karakter vanSeptotinia podophyllina G. van den Ende Hoofdartikelen Pages: 269 - 280
Studies of yield losses I. The self-limiting effect of injurious or competitive organisms on crop-yield S. H. JustesenP. M. L. Tammes Hoofdartikelen Pages: 281 - 287
Serological and electron microscopical investigations of the relationship betweenSorgum red stripe virus and sugar cane mosaic virus J. DijkstraP. Grancini Hoofdartikelen Pages: 295 - 300
Electron microscopical investigations of mosaic diseased wheat plants found in Italy J. DijkstraP. Grancini Korte Mededeling Pages: 301 - 304