Planted Tank Enthusiast
Join Date: Nov 2003
Location: Vancouver, B.C.
I would be weary of using fresh wood as well, but if you absolutely had to, I would boild the daylights out of it for as long as possible, and then let it sit submerged for a long time (1-2 weeks) with daily water changes. You could monitor the water during that time (test kits and visually) for parameter changes and fungus.
Once you start to get clean water after it has been sitting for a while, you may be OK.
I am not guaranteeing success, but this method has worked in the past for me.