I had this happen to the the body of the guitar I made myself back in the late 70s. Some two years after the instrument had been completed, one day I noticed a number of small holes had appeared in various locations on the body exactly like the one shown in the OP. I rushed out to the local hardware shop and purchased a small tin of woodworm fluid which I injected into the holes as directed. No more holes appeared, whether that was because there were no more insects left to emerge or because the treatment had killed off the others I don't know. However the glued-in neck joint failed about a year later, again whether that was due to insect activity I don't know, but several of the exit holes were in the area of the neck body joint.