At the 12th meeting of the IRG in Sarajevo, Yugoslavia it was decided after considerable discussion that the best way to proceed with the work of the subgroup was to centre it around a co-operative field trial based on the L-joint test detailed in IRG/WP/2157. At the same time it was agreed that interested laboratories would also conduct their own methods, particularly the German planner test and the French and Yugoslavian inoculation techniques. It has since been decided to concentrate the main part of the test within Europe using Pinus sylvestris joints from a common source and to provide chemicals to other laboratories interested in conducting a similar trial with their own wood species. In this way it is hoped to achieve a tightly controlled comparative test with the CEN countries and to allow greater international comparison. The test is to employ simulated joinery units treated with a good and poor preservative system and exposed out of doors. Periodically replicates will be examined destructively. The destructive examination will consist of a measure of the onset of increased permeability of the wood and the initiation of colonisation by wood destroying Basidiomycetes. It is proposed to use two levels of TnBTO in a model preservative and to apply the preservatives by dipping and by double vacuum.

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