Douglas-Fir Plywood: Its Treated and Natural Resistance to Termites

Douglas-fir plywood test sections that included three treatments (two with preservatives, one control) were tested for resistance to subterranean termite attack by a laboratory method. The test differentiated between the three treatments by means of test criteria of wood volume losses and the number of test-section faces attacked. Untreated Douglas-fir was seriously attacked by subterranean termites–thus failing to prove that Douglas-fir has termite resistance, although it may be less palatable to termites than other woods. Data are presented on estimated killing time, volume loss measurements, and number of block faces attacked for 30 plywood test blocks after a 25-day exposure to subterranean termites.

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