“The mountain pine beetle is a tiny creature that chews through a lodgepole’s bark, gouges out a hollow in the wood and lays its eggs. The larvae hatch hungry and feed on the cambium layer, a tree’s most vital part, the annual layer of cells that makes up a growth ring. To prevent drowning in the tree’s sap, the beetle larvae can eject a choking fungus that not only halts the life-giving flow of sap, but stains the wood a grey-blue color.”
