These compounds can provoke cell perturbations
at the membrane structure level and Pseudomonas spp.
have been identified as one of such antagonists (Ellis et
al., 2000). However, colonization of the mycelium of P.
ostreatus was strongly established in this work to be
affected adversely by the presence of some bacteria and
fungi in its cultivation substrate when cultivated on
pasteurized or unsterilized substrate as compared to that
sterilized. Therefore, an uninterrupted colonization of
mycelium could be achieved by proper sterilization of the
substrate(s) or media used for the mycelium propagation
of the mushroom. As a matter of fact, an ideal sterility
should also be maintained during spawn inoculation as
well as the during mycelium colonization of the substrate