Metabolites released from Trichoderma viride, T. polysporum, T. hamatum and T. aureoviride were
tested in culture medium against Ceratocystis paradoxa, which causes black seed rot in oil palm
sprouted seeds. The Trichoderma metabolites had similar fungistatic effects on the growth of C.
paradoxa except those from T. aureoviride. The inhibition varied depending on the Trichoderma species
producing the metabolites; from 2.0% to 64% in volatile, 0.0% to 74% in non-volatile and 0.0% to 81%
from direct-diffusible metabolites. C. paradoxa growth was significantly reduced in the presence of
metabolites produced by T. viride and T. polysporum than the other species. T. aureoviride had the
least growth inhibition, and medium containing direct-diffusible metabolite supported highest inhibition
of C. paradoxa.