Cicadas have piercing/sucking
What do cicadas mouths look like?
The cicada's mouth parts (aka rostrum or beak) are in the shape of a straw, which can pierce rootlets, roots and branches. The labium form the outside of the beak of the cicada; inside the labium is the stylet which is comprised of the mandibles and maxillae, which the cicada uses to pierce plants and drink their sap.
Do cicadas eat?
What Do Cicadas Eat? During their time underground, cicadas primarily feed on the juices and sap of tree roots. Once above ground, adults may feed on plant juices which can cause minimal damage to trees.