Blue Sap?

Larry Caldwell larryc at
Mon Jan 26 00:41:24 EST 1998

In article <19980125134001.IAA00103 at>,
jostnix at (Jostnix) wrote:

> Blue kinda sounds fungal.  To some of our resident mycologists - can fungi
> thrive in pine sap?

> I know that "blue stain" is a fungi that enters southern yellow pine logs when
> conditions are right.  It is not a problem structurally but does decrease
> lumber grade.

Blue stain is an early indication of sapwood decay.  As long as the wood
remains sound, there is no deduction for scale.  However, as you note,
blue stain is not allowed in some log grades, and may result in a deduction
in grade.

-- Larry

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