A key element for pathogen control in hydroponic systems is the
inactivation of zoospores (Calvo-Bado et al., 2003). While the
possible benefits of biosurfactants in non-soil systems and
the potential for their production in situ using non-pathogenic
strains of fluorescent pseudomonads have been discussed, there
is a lack of knowledge concerning how biosurfactant-producing
strains could be supplied to the cultivation system. The aim of the
present study was therefore to evaluate ways of supplying a biosurfactant-
producing strain to a recirculating hydroponic cultivation
system infected with a zoospore-producing plant pathogen.