Non-native forest insects and pathogens in the continental US

This is a database of 455 nonindigenous forest insect species and 16 pathogen species, compiled from published sources and expert input, with at least one recorded location of establishment in the continental United States. Species that have gradually expanded their range in a continuous fashion as a result of migration or climate change, and indigenous invaders, i.e. species native to the US introduced into previously uncolonized regions of the US, were excluded. Species included in our list had to feed on at least one tree species represented in the national Forest Inventory and Analysis (FIA) database maintained by the USDA Forest Service. We excluded insects and pathogens that primarily colonize citrus, shrubs, herbaceous plants, dead or processed wood as well as those that are primarily detritivores, predatory, parasitic, pollinators, aquatic, or that feed only occasionally on trees.