They Make Holes

Top: Cicada cast skin
Bottom: Cicada emergence hole

Cicada immatures live underground feeding on the roots of trees. Tree roots can extend far from the trunk and cicadas can feed on roots far from the center. When it is time to emerge, cicadas dig their way to the surface leaving round emergence holes in the soil. The greatest concentration of roots and cicadas are close to the trunk so cast skins are frequently observed on the trunk of the tree. However, any vertical surface can be…

Source: Living With Insects Blog

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