The different treatments (Table 1) were added once a week,
starting when the plants were transferred to the gutters. The
biocontrol treatments were added 2 h before the zoospore
suspension was added. The length of the plants was measured
every week. At an age of six weeks the plants were harvested. Fresh treatments. Furthermore, when KB broth in which no cells had been
cultured was added to the system a significant reduction in plant
growth was observed. Using P. koreensis 2.74 cultured in minimal
medium with oil as a carbon source also resulted in significantly
decreased growth of the plants.