I work with elm saplings a lot, and encounter this . it is the first place to check on the belly while drying and often ends up in my handles. It is almost never a problem in the limbs, though, because, even from a 3" across sapling, I'm usually well out of it by the time I hit a shooting thickness. I have had trouble when I encountered it when making kids' bows from very small saplings.
Elm and mulberry and ash seem worse than chokecherry, or plum.
