Vascular diseases caused by Fusarium oxysporum f.sp. dianthi and Phialophora cinerescens are economically important in carnation greenhouses at the Bogota Plateau. These pathogens were introduced from different countries through infected propagative material and their incidence has quickly increased due to a high dissemination rateo soil persistence and low efficiency and high costs of the control measures used. Five experiments in different farms using a combination of steam, several fumigants, systemic fungicides and the application of some iso lates of Trichoderma harzianum, Pseudomonas putida and Serratia liquefasciens were set to evaluate control of vascular diseases from 1983 to 1986. Flower yield was also measured. The application of Metham-sodium plus steam before planting and steam alone caused the lowest mortality of plants and the highest flower yield. The use of antagonists in the soil did not control satisfactorily the diseases. Systemic fungicides showed a low efficiency for control.