The investigation evaluated the toxicity to termites and the leaching stability of copper compounds derived from tri-and dioctylamine-boric acid complexes. Wood treated with these copper (II) compounds was resistant to subterranean termite attack in a modified nutritive supplement test. High or complete termite mortality occurred at 0.08 pcf (or 0.2%) for unleached, and 0. 89 pcf (or 2%) for leached blocks. A notable advantage of the copper compounds over conventional wood preservatives was that termites acquired toxic doses by slight feeding on the treated wood; thus, unlike wood treated conventionally, these treatments might protect nearby untreated wood from attack.