Annual
Cicadas in general are not harmful. Due to their relatively
small numbers that are spread over a wide area they do no noticeable
damage to flora. While they do have a rigid mouth part known as a beak,
it is in the shape of a stylus and is used for withdrawing Xylem
from trees or other plants. The fluids obtained are believed to be used
to help the process of evaporative cooling on hot summer days. The amount
of fluid obtained from a tree by a Cicada has no noticeable affects
on trees or other plants. Annual
Cicadas are actually beneficial as they are often preyed upon
by birds, spiders, snakes and other fauna.
With regards to Periodical
Cicadas it has been speculated that due to their massive concentrations
there may be "stresses" put on their host plants. One way
is from oviposition damaging small twigs on a plant or tree resulting
in altered branch architecture, reduced growth and fruit crop loss.
Another may be caused by Periodical
Cicada nymphs in their juvenile stage when feeding on Xylem,
resulting in reduced wood growth and flowering of shrubs and trees.
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