On biotypes of the cereal-root eelworm (Heterodera Avenae) and resistance in oats and barley J. KortG. DantumaA. van Essen OriginalPaper Pages: 9 - 17
Production of virus-free carnations by means of meristem culture H. van Os OriginalPaper Pages: 18 - 26
Verticillium albo-atrum as a parasite ofSenecio vulgaris A. MattaL. C. P. Kerling OriginalPaper Pages: 27 - 32
De identiteit van de echte meeldauw bij cucurbitaceae G. H. BoeremaH. A. van Kesteren Short Communication Pages: 33 - 34