Sterilisation procedure with DICA proved to be better for all three genotypes. In the case of first genotype sterilised with DICA, 38.2% of uninfected plants were obtained. The sterilisation of the second genotype was less successful and only 24.7% explants survived the sterilisation with DICA, whereas the percentage of non vital explants was the highest, reaching 49.5%. We can conclude that the concentration of DICA was too high, or time of treatment was too long for this genotype. The most successful sterilisation was obtained in the third genotype, where 86.9% uninfected and vital explants were obtained. The percentage of contaminated and non vital explants was much higher after the sterilisation with sodium-hypochlorite for all three genotypes (Table 1). Results show that successful induction of in vitro culture dependents not only on sterilisation method used but it is also very specific for each genotype. Valles (1987) sterilised explants of 12 different rose genotypes and the number of infected plants depended strongly on the genotype used. In his study, the percentage of infected plants appeared in range from 2.5 to 58.3%. The occurred infections of plant material after chemical sterilisation can be caused by internal infections (micro-organisms present inside the plant itself), which can be reduced with the use of appropriate antibiotics. Other reasons for later occurrence of infections could be inaccurate work (non-sterile forceps or scalpels; working surface not sterilised with 96 % alcohol; not sufficiently sterilised nutrient media; etc.) (Pierik 1998). It is well known, that the growth and proliferation of roses depend strongly on cultivar (Kane 2000). Horn et al. (1988) reported that nodal explants showed better results than shoot tips and that the subcultured shoots with long internodes were more suitable than subcultures from compact shoots with short internodes (in means of growth, number, length and fresh weight of newly obtained shoots