Interactions (reciprocal effects) between wood fungi have been early investi-gated e.g., by Oppermann (1951) and Leslie et al. (1976), and were described in detail by Rayner and Boddy (1988). Antagonism (competitive reciprocal effect), the mutual inhibition and in a broader sense the inhibition of one organism by others, is based on the pro-duction of toxic metabolites, on mycoparasitism, and on nutrient competition. Antagonisms are investigated as alternative to the chemical protection against tree fungi ("biological forest protection") and against fungi on wood in service ("biological wood protection") (Walchli 1982; Bruce 1992; Holdenrieder and Greig 1998; Phillips-Laing et al. 2003). As early as 1934, Weindling showed the inhibiting effect of Trichoderma species on several fungi. Bjerkandera adusta and Ganoderma species were antagonistic against the causing agent of Plane canker stain disease (Grosclaude et al...
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