This document reports progress on the co-operative study between nine laboratories, set up following the proposals contained in Document IPG/WP/2316 (1988). Results have been received from eight laboratories. Toxic values data have been established successfully for the test fungus Coniophora puteana with soil, malt agar and vermiculite methods and with the test fungi Gloeophyllum trabeum and Poria placenta in the soil method. With Coniophora puteana, there was less variation between the different methods carried out at the same laboratory than with the same method in different laboratories. Various options for further work are put forward for discussion.

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