City planners take note:
Tree diversity helps prevent pests from gaining a foothold, said Mike Bohne, forest health group leader for the United States Forest Service. It also makes it so that a community does not lose its entire urban canopy if there is an infestation.
Too late for Worcester, Massachusetts (USA), where 80% of the street trees are maples. Most of them are infested by the Asian long-horned beetle and need to be removed. Property values may plummet further.
The beetle was introduced to the USA with wood packing material from China. Eradication efforts are intense as much larger economic damage is looming. Worcester is in New England and the invasive beetle might now spread to the famed maple forests that produce large quantities of syrup, wood, and leaf-peeping tourists.