Further investigations on the interrelations between the apple leaf miner Stigmella malella and its parasite Cirrospilus vittatus in The Netherlands H. H. EvenhuisM. Soehardjan OriginalPaper Pages: 1 - 7
The identification of three new viruses isolated from Wisteria and Pisum in The Netherlands, and the problem of variation within the potato virus Y group L. Bos OriginalPaper Pages: 8 - 46