The synergistic action of the two triazoles propiconazole and tebuconazole against wood rotting fungi can clearly be demonstrated by determination of toxic values according to Standard EN 113. The results show that by combining both triazoles a better balanced spectrum of activity can be achieved. The reduction of the toxic values against the white rot fungus Coriolus versicolor (toxic values of the combination remarkable below the values of the individual active ingredients) proves particularly clear the synergistic behaviour of the combination. Additional trials with such combinations (L-joint-tests, lap-joint-tests, soil block tests) are initiated.

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