Test stakes of radiata pine treated with various alkyl ammonium compound (AAC) formulations and with copper-chrome-arsenate (CCA) as reference preservative were installed in 3 test sites in Japan in 1981-82. When inspected in 1995, CCA-treated stakes showed less decay at all three sites than stakes treated with other formulations. Ammoniacal copper quaternary (ACQ)- treatment was only slightly less effective than CCA at two sites (Tsukuba and Fukiage-Hama), but more markedly less effective at the high decay hazard Uji site. Unamended AAC treatment was least effective, but there was little difference in performance between didecyl dimethyl ammonium chloride (DDAC) and benzalkonium chloride (BAC) formulations.

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