Heartwood temperatures of red pine pole stock during pentachlorophenol pressure treatment and presence of decay fungi prior to treatment

Commercial treatment of red pine pole stock with pentachlorophenol in oil using a modified empty-cell process did not result in achieving the desired sterilization goal of 150?F (65.6?C) at the pith for a period of 2 hours using oil at 180?F (82.2?C). Increasing the treating solution temperature to 220?F (104.4?C) did achieve the sterilization regime in poles up to 15 inches in diameter but not in poles with larger diameters. Decay fungi were cultured from heartwood core sections in only 2 of 30 poles tested, indicating a very low incidence of potential decay fungi in red pine pole interiors aged 4 to 7 months after felling.

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