Abstract
Following investigations in 1973 and 1974, further studies were made during 1969-1972. These have enabled us to confirm that a five year break in the cultivation of Yellow Lupin, combined with an adequate selection of quality and sequence of plants, is able to lower the inoculative potential in the habitat of Fusarium oxysporum f. sp. lupini which resulted from an earlier epidemic. The persistance of Fusarium oxysporum f. sp. lupini in the soil is very durable. Protection of Yellow Lupin is additionally effected by the use of resistant host plants thus minimizing the further persistance of the pathogen.