Here is how it works: "Many species, such as the mountain pine beetle (Dendroctonus ponderosae) attack and kill live trees. Most, however, live in dead, weakene

Here is how it works: "Many species, such as the mountain pine beetle (Dendroctonus ponderosae) attack and kill live trees. Most, however, live in dead, weakened, or dying hosts." https://en.wikipedia.org/wiki/Bark_beetle#Ecology https://en.wikipedia.org/wiki/Bark_beetle#Ecology