A new fungicide combination for prevention of kiln brown stain of white pine

Eastern white pine often develops a surface brown non-microbial stain when kiln-dried. Such stain downgrades high quality lumber and is likely to occur when fresh, unseasoned lumber is stacked during warm weather prior to kiln-drying. Use of chemical reducing agents or pH alteration have been successful control agents, but may have some practical limitations for general use. A new combination of fungicides (chlorothalonil and methylene bis[thiocynate]) was tested for ability to also control brown stain in pine lumber by a short dip treatment of green lumber. The results from two independent laboratories indicated that the new formulation was more effective than sodium thiosulfate, and similar in performance to sodium azide. This co-biocide system should provide the white pine lumber industry with both sapstain and brown stain protection.

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