In vitro assays were undertaken to evaluate the control of two sapstain fungi, Leptographium procerum
and Sphaeropsis sapinea by a combination of chitosan or chitosan oligomer and an albino strain of Trichoderma
harzianum. Spore germination and hyphal growth of the test fungi were assessed on media
amended with chitosan or chitosan oligomer with and without T. harzianum using either simultaneous
inoculation with test fungus or 1, 2, or 3 days after pre-infection with test fungus.