Although the first publications on experimental soft rot attack date back 20 years ago, so far no test method for evaluating the efficacy of wood preservatives against soft rot attack (Ascomycetes and Fungi Imperfecti) has been generally accepted. The reasons are diverse and the shortcomings and the disadvantages of the methods described are well known and have repeatedly been discussed. The soil burial method developed by G. THEDEN (1961) using non-sterilised soils with their natural flora of micro-organisms is said to be poorly reproducible. One possibility to work with clearly defined test fungi and easily reproducible test conditions was developed and described by P. KAUNE in the BAM as the vermiculite burial method. For the further development of this method, in the past years numerous investigations have been made in the BAM to select test fungi and define a test arrangement. Their results will be summarised below.

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