Laboratory modified agar-block tests were made to determine the fungitoxic value of the wood preservative CCA against the test fungus Serpula lacrymans using statistical methods. With the aid of statistical computer programmes based on the least square method. the regression equation was found for the dependence between sample mass loss and preservative retention both in terms of percentage and following probit, decimal and natural logarithmic transformations. The fungitoxic value was found to be lying in the point of intersection between the lines calculated and that of a 3 per cent mass loss. The application of mathematical statistics seems to have increased the objectivity and repeatability of measurements of fungitoxic value in the case of this wood preservative.

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