The problem of invasions by non-native plant pests has come to dominate the field of applied entomology. Most of the damaging insect pests of agriculture and forestry are non-native (Sailer 1978, Aukema et al. 2010) and this is a problem being faced around the world. This problem did not arise overnight; instead, there has been a steady accumulation of non-native insect species in nearly every region of the world over the last two centuries. Yamanaka et al. (2015) reported that there are presently more than 3,000 non-native insect species established in North America, and most are plant-feeding species.
Liebhold, Andrew M.; Griffin, Robert L. 2016. The legacy of Charles Marlatt and efforts to limit plant pest invasions. American Entomologist. 62(4): 218-227.