Join Date: Jan 2011
Location: Jacksonville, NC
I have seen green tint/streak on cherry where sap & heart wood meet. Took it, as a bonus never thought it mold. Found out about chemical staining, which can be part of drying process.
Yes, mold will grow on wood while in paper or plastic bags. Putting shavings in the bag can accelerate mold growth. Normally mold will stop growing on wood when MC gets below 20-22 percent.
How to stop mold and staining of wood has no easy answer. Mold & staining caused by different fungi degrade value of wood, but does not always affect strength. Wood staining can exist in diseased or storm damage trees. Wood staining can start soon after trees felled and left laying on the ground. Mold & staining fungi not visible to naked eye can grow anytime during handling process if environmental conditions right. Sometimes turned away, sometimes not, there are chemicals added to lumber to prevent growth. I have posted pictures of turned projects staining not removed.
Some parts of the country more prone to growth of stain & mold. Some wood species more prone than others do for mold & staining.
Only way, know how to stop fungi growth conditions is take blanks out of bags and speed up drying process. Do not always add shavings.