The list of invasive insects in the United States is a long one, but one entomologist offers his list of the four “most wanted” (clockwise from top left):  the spotted lanternfly (Lycorma delicatula), the brown marmorated stink bug (Halyomorpha halys), spotted wing drosophila (Drosophila suzukii), and the khapra beetle (Trogoderma granarium). (Photo credits, : top left, Lawrence Barringer, Pennsylvania Department of Agriculture, Bugwood.org; top right and bottom left, Rob Morrison, Ph.D.; bottom right, Hannah Burrack, North Carolina State University, Bugwood.org)