Blue stain fungus in White pine needs three things to grow: food, water, and warmth. The food is the sugar in the sapwood. Look at an affected timber and note that it doesn't grow into the heartwood. The water is the moisture in the timber. Once the timber dries, the mold won't spread. It also only seems to grow in warm weather. The only thing you can really control is the moisture. When my sawyer cuts white pine in the warm months, he dips them in a fungicide that will hold the fungus at bay for a few months. When I get them, I carefully stack them, and keep air moving over them at all times (indoors, with fans). That way, they are dry when the fungicide wears off. You can spray regular old laundry bleach on the blue stain, to immediately stop the growth. This will also lighten the stain color somewhat, but will also color the timbers a little yellow. Good luck. CB.
