This manuscript reports a seemingly innocuous, but very rapid invasion that is turning out to have unexpected consequences. Ambrosia beetles are known for their impact on living tree ecosystems and industries, but this is the first case in which an ambrosia beetle with a very unusual fungus is beginning to impact wood degradation on a regional scale less than a decade after its establishment in the US. The reason to publish as a pre-print is that a complete dataset on the impact of this symbiosis is not available, and we are not aware of any research group that is collecting such data. Yet the spread of this symbiosis is so rapid, and the impact is substantial but difficult to notice, therefore we would like to notify the community of invasion biologists soon.