A range of Trichoderma species and strains were tested for their ability to produce fungistatic volatiles. Volatiles from all isolates produced fungistatic effects on Lentinus lepideus however wide interspecies and interstrain variability in the level of response was evident. Cross plating studies between the Trichoderma isolates and Lentinus lepideus showed that Lentinus lepideus was overgrown and lysed by its Trichoderma competitor in all cases. The results indicate that the rate of overgrowth of Lentinus lepideus was directly related to the levels of volatiles produced by each of the Trichoderma isolates. The implications of the results on the use of Trichoderma species as biological control agents is briefly discussed.

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