I had a tree infected with the beetle once. I realised there was a problem when the top half of the tree just fell off one day. It was up there with the worst smells I have ever encountered, made even less pleasant when the nearby bees nest blamed me for the demise of their food source and attacked en masse. Amanda's husband kindly lent me a man and a chainsaw to cut what was left down and set it on fire. That was fun.