As it was assumed from previous experiments, the probit analysis appears to be the most suitable method of all used to estimate the toxic value of wood preservatives. With the help of the classical agar-block method the probit analysis was tested for its suitability in: 1) fungitoxic value estimation of the WR-3 preservative (quaternary ammonium compound + borate), as compared to different test fungi (Coniophora puteana, Gloeophyllum sepiarium, Lentinus lepideus, Poria placenta, Serpula lacrymans), and 2) in leaching value estimation by the mycological method (Coniophora puteana)

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