Thirty-two compounds were tested to determine their ability to contain the growth of stain, mould and rot organisms on fresh Pinus radiata D Don. A screening technique was employed using 35 to 50 mm diameter biscuits of Pinus radiata stemwood 10 mm thick. No compound was found to be cost effective when compared against the standard treatments of NaPCP (0.5% a.i.) plus borax (1.5%) and Captafol (0.2% a.i.). The best compound identified was a guanadine compound Guazatine which at 0.2% a.i. was slightly better than the standard treatments employed in New Zealand. From these results and previous published work it would appear that mixtures offer more hope of a low hazard, cost effective treatment to replace the presently used industrial standard.

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