Spotted lanternfly (Lycorma delicatula) is an invasive planthopper that feeds on a wide range of plants, including grapevines, hops, stone fruit trees, and hardwood trees. When the spotted lanternfly feeds, it excretes a sticky, sugary fluid that promotes sooty mold growth, which can further damage plants. Its preferred host is tree-of-heaven (Ailanthus altissima), and today 19 States and the District of Columbia have some degree of infestation. (USDA)