No good... don't waste your time.
I had some Pacific Yew billets sent over had bug damage in the sapwood (the bugs hadn't read the book that says they don't eat Yew 'cos it's toxic
)
I picked out 2 that looked clean... got a bow built and drawing about 26" when it exploded... bug hole straight across the back just below the surface, and that's where it blew...
I never did figure out how the hole got there as I couldn't find the entry of exit point... devious little bugs
Del
PS. I took the sapwood off the other billets and backed 'em with some English Yew sapwood making a Transatlantic bow