Bark beetles use inter and intra-specific semiochemicals to regulate and control their host selection,invasion and attacking,and,in turn,to regulate population density and ecological distribution in forest ecosystem.This review briefly summarizes the functions of semiochemicals in various bark beetle behaviors such as host selection,attacking,settlement,and reproduction,and describes the theories of bark beetle host selection,with emphasis on host and non-host volatiles.In addition,the identified bark beetl...