hundreds of invasive spotted lanternflies lycorma delicatula covering a tree of heaven ailanthus altissima and excreting honey

agricultural ailanthus altissima animal around base black bug bunch cluster covered damage delicatula destructive disgusting excreting excretions fly garden gross group growing heaven honeydew host hundreds infestation infesting insect introduced invasion invasive lantern lanternflies lanternfly lycorma mold nature pennsylvania pest problem sooty species spots spotted swarm threat tons tree trunk