??? Ambrosia beetles???

[caveman]

 

  

 
These pictures are of some boards we sawed out of a blown over longleaf pine.  The logs we cut out of the tree had been soaking in my pond for months until we were ready to use the tree for lumber.  The holes in the 3/4" boards are about 1/32" in diameter.  There are no bugs present now.  Would you suspect ambrosia beetles did this when the logs still had bark?  Thanks for sharing your knowledge.  I assume the holes were there when we sawed the boards, but I did not notice them. 
Caveman

[WDH]

Yes, ambrosia beetles.  They infest the tree as it is dying or immediately after it is cut and felled.  As the wood dries, they complete their life cycle and leave.  The black lined hoes are distinctive characteristics of ambrosia beetles, caused by a fungus that they host. 

[caveman]

Thank you WDH.  I learned how to identify ambrosia beetle attacks by looking for boring dust at the base of the trees or by the distinctive shape of the beetles themselves. 
Caveman

[WDH]

Sometimes you can hear them chewing away in dying SYP killed by Annosum Root Rot or Southern Pine Beetle.