Influence of Fungus Infection Associated with Chemipeeling on Pressure Impregnation and Cold Soaking of Jack Pine Posts

Five types of Pinus banksiana posts and three preservative treatments were studied for improvements in preservative retention. Three types of posts were prepared from unpoisoned trees; one type as cut (control), one type where mold was discouraged by use of a 3 percent sodium pentachlorophenate solution, and one type where mold was encouraged with a 3 percent sodium fluoride solution. Two pole types were prepared from arsenic girdled trees: one type cut 1 week after poisoning and treated with a 3 percent sodium pentachlorophenate solution to discourage mold growth, and one type cut 4 months after poisoning to allow natural fungus growth. Ten of each type post were treated by cold soaking 6 hours, cold soaking 24 hours, and pressure impregnation with coal-tar creosote. The preservative retention in the posts (from poisoned and unpoisoned trees) treated to retard fungus growth varied little from the control posts for all the impregnation treatments. Fungus growth in both the poisoned and unpoisoned trees improved preservative retention for all three preservative treatments, however the improvement was not so great as with impregnation.

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