Graduate Thesis Or Dissertation

 

Controlling biodeterioration of western wood species with over- the-counter wood preservatives Public Deposited

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  • Over-the-counter (OTC) wood preservatives can provide wood with both a moisture barrier and fungicidal protection against biodeterioration, yet there is little comparative data on the performance of these preservatives. In this study, the potential of various low-toxicity, OTC preservatives was evaluated on five western wood species, western red cedar (Thuja plicata),western hemlock (Tsuga heterophylla), Douglas-fir (Pseudosuga menziesii), lodgepole pine (Pinus contorta), and coastal redwood (Sequoia sempervirens). The active ingredients tested were copper-8-quinolinolate, copper naphthenate, zinc naphthenate, 3-Iodo 2-propynylbutlycarbamate (IPBC), Bis (tri-n-butyltin) oxide (TBTO), TBTOIPBC, TBTOchlorothalonil, and TBNtrichloromethylthio-phthalimide (Folpet). Small blocks and stakes of each species were dipped for 3 minutes inone of twelve OTC preservatives to simulate homeowner application. To examine the efficacy of these preservatives, treated blocks were subjected to a modified American Society of Testing and Materials Standards (ASTM) D2017-81 soil-block test to evaluate above ground decay resistance as measured by wood weightloss following exposure to Postia placenta (Fr.) Cookeor Trametes versicolor (L:Fr.) Pilat, a brown and white rot fungus, respectively. Test stakes were placed insoil-beds maintained in an environmentally controlled greenhouse. The stakes were evaluated for the degree of decay at 3 month intervals for the first year,followed by 18 and 24 month ratings. Preservative treatments improved performance of most species except lodgepole pine; improvements were most noticeable in soil-bed trials with redwood and western red cedar. The results suggest that topical application of commercially available preservatives has merit for enhancing the performance of naturally durable woods in soil contact,but their value for less durable woods is questionable.Wood used above-ground will benefit most from such topical treatments, however, for best performance a yearly reapplication might be necessary for the less durable wood species.
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