I don't know. Maybe I am just lucky, but my last batch of wood is Birch,and Elm. The trees were all about 4 to 6 inches in diameter.The Elm I cut right down the middle with a chain saw, and split the Birch green. I have forms ,so I got 6 staves down to floor tiller ,and straightened ,and clamped them to forms. I let them dry on the forms in the basement at 62 degrees.The rest I left the bark on, and Painted the ends. I have since been taking a stave at a time,and debark it, and go through the same procedure to make a bow.No checks,and no cracks, or bugs in the wood. All that I use is paint to seal the ends.