Got flagging? Flagging happens when tree branches wilt or die due to cicada egg laying, resulting in bunches of brown leaves. Don’t worry, this will not cause trees to die, unless they are small and weak trees. Flagging can actually do a tree a favor, by removing its weakest branches.
Note: the Magicicada.org report page is closed for the season but will open again for future emergences.
Some video of cicada flagging:
A photo of flagging: