Effectiveness of Groundline Treatments of Creosoted Pine Poles Under Tropical Exposure

Three propietary groundline wood preservative formulations were applied to weathered southern pine pole stubs initially treated with cresote. Under test were penta-gel, fluoride-creosote, and fluoride -arsenic formulations. The amount and distribution of pentachlorophenol or sodium flouride after 1, 3, and 5 years of exposure was determined, as were decay patterns after 5 and 10 years of service. Residual toxicity after the 10-year exposure period was also determined using soil-block bioassays. After 8 years of storage and 10 years of ground contact, creosote control stubs were severely attacked by decay fungi. All three groundline applications deterred decay. The most effective was the fluoride-arsenic injection treatment.

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