The research was carried out in a commercial farm, located in Madrid, Cundinamarca. The purpose of the study was to established the rate and irequency of application of Streptomyces griseoviridis (Mycostop) in the control of vascular wilt of carnation caused by Fusarium oxysporum f.sp. dianthi. Two experiments were conducted to compare three rates of application (0,025;0,05 and 0,01 g/m2) and three intervals of application (1,2 and 4 weeks) of Mycostop, in two standard carnation varieties. Disease progress data were analized by comparing their godness of fit to Gompertz and Monomolecular epidemiological models. By using the simpler linear regression model, the rate of inlection (k) and the coefficient of determination (Al) were calculated. Inlection rates were subjected to analysis of variance. The results showed no satislactory control of the disease. Rates and frecuencies of application of Streptomyces griseoviridis (Mycostop) did not show appreciable differences. Epidemiologically, k values were highly homogeneous among the different Mycostop treatments. Streptomyces griseoviridisis highly dependent upon culture media pH, and it grows only at a pH 016,4 or higher, with an optimal growth at a pH 7,0. No relation was detected between growth of the biocontrol organism and levels of electrical conductivity.