Pinus radiata samples were impregnated with a range of light organic solvent preservatives and copper/chrome/arsenic salt and exposed with no surface coating both in and above ground for 12 years. Inspection of the test samples revealed that some formulations of light organic solvent preservatives will give good fungal protection and reduce splitting in Pinus radiata exposed externally without a supplementary surface coating. Tributyltin oxide performed poorly in the test compared to pentachlorophenol which gave relatively good protection under both hazard conditions. Copper/chrome/arsenic salt was clearly the most effective.

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