The inoculations of antagonist were done at 0, 30, 60 and
90 days from the beginning of the experiment in order to maintain
sufficient populations of the antagonist in the soils and hence to favor
biological control, as suggested by Knudsen et al. (1991); and
the pathogen at 14 or 30 days, and 8 or 10 replicates were used
depending on the experiments. The experiments and description
of treatments are given in Table 1.