Field Trials of Chemicals to Control Sapstain and Mold on Yellow-Poplar and Southern Yellow Pine Lumber

The effectiveness of 3-iodo-2-propynyl butyl carbamate (IPBC), sodium pentachlorophenate (Na-PCP), and copper-8-quinolinolate (PQ-8) in prevention of sapstain and mold on freshly cut yellow-poplar and southern yellow pine lumber when bulk-piled or stickered under field conditions was investigated. Treatment of all yellow pine lumber and the yellow-poplar lumber using PQ-8 was completed during late July 1981. All other yellow-poplar treatments were completed during late May and early June 1981. The treating and storage of all lumber was done near the Purdue University campus, West Lafayette, Indiana. Na-PCP was the most effective fungicide on bulk-piled yellow-poplar after 8 weeks of exposure followed closely by 1.5 percent, then 0.75 percent IPBC. The best treatments on bulk-piled yellow-poplar were effective between 8 and 12 weeks. All treatments exhibited superior protection wen applied to bulk-piled southern yellow pine. After 12 weeks’ storage 0.5 percent IPBC plus 2.0 percent borax, 1.5 percent IPBC, and 1.0 percent Na-PCP treatments were the most effective. Useful effectiveness of these chemicals on bulk-piled pine did not carry over to the second summer of storage. Stickered yellow-poplar was well protected by IPBC for as long as 46 weeks of exposure: after 67 weeks only the 1.5 percent IPBC provided suitable protection. Stickered southern pine yellow pine was well protected by all treatments after 12 weeks, marginally protected after 42 weeks, and not protected after 62 weeks.

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