It was originally intended that each participant would expose L-joints in the main trial on 1 April 1983 with the first sampling at 8 months (1 December 1983) and the second sampling at 18 months (1 October 1984). In the event, some participants have had to vary this schedule. Results after the first sampling have been received from CTFT (8 months), BAM (12 months) and Sipad-IRC (8 months) and after the second sampling from PRL (18 months) and Sipad-IRC (17 months). These, together with data presented previously, show a good correlation between gradual increases in permeability and the increasing incidence of Basidiomycetes. Both double vacuum treatments are proving more effective than the dip treatments; at the present stage 1.0% TnBTO appears to be no more effective than 0.5% TnBTO. The major difference between Institutes appears to be the rate at which colonisation and attack occurs rather than in the patterns of colonisation.

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