Laboratory soil block studies of alkylammonium compounds (AAC's) at Forintek and other research establishments have shown that they can prevent decay by standard wood-destroying fungi. Their performance in field tests, however, has been disappointing. Following investigation of possible causes for this poor field performance, stakes treated with modified AAC's were installed at Westham Island. All three formulated AAC's have shown greatly improved performance over the unmodified material. The inclusion of ammoniacal copper oxide with Barquat MB 80 (an alkyldimethylammonium chloride) is providing excellent performance after four years with log scores of 100 at retentions of 7 kg/m³ (total preservative). Stakes treated with the same AAC modified with tributyltin chloride to a retention of 1.2 kg/m³ (total preservative) had a log score of 87 after five years.

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