Micronized Copper Azole (MCA) was evaluated for its ability to resist biodegradation at two Canadian test sites using Pacific silver fir and white spruce stakes, and lodgepole pine and red pine roundwood posts. After 12 years of exposure the treated stakes exhibited low to moderate levels of decay while the untreated controls had failed. When stakes were moved to an active termite site, the untreated controls rapidly failed, while the treated materials were largely unaffected. After 11 years of exposure the roundwood posts were largely sound while untreated controls had mostly failed. Together these data continue to show that MCA can provide long-term protection against biodegradation to several Canadian species.

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