The document discusses several tree pests including the Asian longhorn beetle, emerald ash borer, gypsy moth, and western pine beetle. The Asian longhorn beetle is native to China and was transported to the United States in infested packing material. The emerald ash borer has killed over 20 million trees in Michigan, Ohio, and Indiana, and firewood quarantines aim to prevent new infestations. The gypsy moth spread to the U.S. in 1870 and prefers oak and aspen trees, with its larvae being eaten by small mammals and birds. The western pine beetle infests ponderosa and coulter pine trees in western states, with tree loss considered a normal ecological process.
