Control of Brown Stain in Eastern White Pine

Six sap stain chemicals were sprinkled on all sides and edges of eastern white Pine (Pinus strobus L.) boards to test their effectiveness in controlling brown and blue stain. Six groups of 50 boards were treated with solutions of the following chemicals: sodium azide and a borate-carbonate buffer (Bazide), sodium pentachlorophenate in a borax buffer (Permatox 10-S), Permatox 10-S plus Bazide, ethyl mercury phosphate in a carbonate buffer (Timsan), Timsan plus Bazide, and a control. These boards were placed in the dry kiln immediately after treatment. Twelve groups of 50 boards were treated with solutions of four levels of concentration of Bazide, one concentration of Permatox 10-S, three levels of concentration of Bazide and Permatox 10-S, one level of concentration of Timsan, three levels of concentration of Bazide and Timsan, and a control. These boards were solid piled 1 week before drying in the kiln. Test results showed that brown stain can be eliminated with the addition of Bazide. Blue stain and brown stain can be controlled at the same time with certain concentration levels of Permatox 10-S and Bazide or with Timsan and Bazide. Grade recovery was increased when the boards were immediately placed in the dry kiln and when kiln-drying was delayed for 1 week.

You must be logged in to download any documents. Please login (login accounts are free) or learn how to Become a Member