hundreds of invasive spotted lanternflies lycorma delicatula covering the trunk of their host tree, the tree of heaven ailanthu

agricultural agriculture america animal bug bunch close closeup cluster covered danger delicatula destructive fly full garden group heaven hemiptera hundreds infestation infesting insect insecticide introduced invasion invasive lantern lanternflies lanternfly lycorma macro nature overwhelmed pennsylvania pest pink quarantine species spots spotted spreading states swarm threat tons tree trunk united usa