I was recently walking my property in central Minnesota (zone 3b) and found a small tree/shrub with what appear to be nuts on it.
My first thought was "wild hazelnut", but the leaves do not look like hazelnut- more like oak?
Is it possible that what appear to be nuts are actually some type of insect cocoons or disease on the tree?
Hi Andre, I am going to say that those are insects. Do you see the holes in the "nuts" ? That is where the insect emerges. I have them all over my aspen trees. This is where they live through the winter. I believe they are a beneficial wasp.