Evaluating Chemicals for Controlling Biodeterioration of Stored Wood Chips

Thirty chemicals and chemical mixtures were evaluated for their effectiveness in controlling fungal degrade in wood chips during outside storage. The chemicals were chos en for their biocidal potential and their non polluting quality. The effective concentration of each chemical was determined by laboratory-controlled incubation of red pine (Pinus resinosa Alt.) inoculated with five mesophilic and three thermophilic wood-degrading fungi. Twenty-three of the chemicals proved effective at various concentrations. Concentrations ranged from a low of 0.05 percent (0.3 lbs/ ton o.d. chips) for 2-heptadecyl-1,5,5,6-tetrahydro-4,4,6- trimethylpyrimidine to a high of 6.0 percent (61 lbs/ton o.d. chips) for thiourea. The remaining seven chemicals proved ineffective at the highest concentration at which any of them were tested.

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