I was at North Haven Gardens this afternoon (thought I heard a pied piper summoning me). I asked about the pecans as well as my acorns. The manager said that it might be a sign that the tree is in stress.
I had been worried about my magnolia looking stressed and bought some tree tonic. Before I could use it we got the heavy rains a few weeks ago. Now I still need to feed my oaks and the magnolia and I have to do it soon!
Good luck to both of us.