Borers are the invisible pest, because the damaging life stages are inside the tree and the adults are rarely seen. Most commonly, the visible evidence of borer damage is only seen when a dead tree is cut down and the bark is peeled off. Under the bark, winding borer tunnels or galleries are noticeable. Through their feeding, the borer larvae have destroyed the cambium layer, preventing translocation of water and nutrients throughout the tree. (continue)