Sapstreak, a fungal invader, attacking sugar maples

I was unaware of this invader until reading this first-person account, but it's all very real know. The list of tree-killers out there is legion, and the bulldozer is just one of them: Hemlock Woolly Adelgid, Chestnut Blight, Emerald Ash Borer, Dogwood Anthracnose, etc.