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After seventeen years the cicadas are coming. Don't know about you, but
as a child, falling to sleep with the cicadas singing was wonderful. As
you have heard, this summer (2007) is the year of the 17 year periodic cicada.Click
here to hear the Cicada sound!
There are many types of cicadas in the world; there are numerous types
here in Illinois. This year we will be listening to a species that emerges
every 17 years.
Although they are called locusts, they are not related to them and are
pretty much harmless to humans and our environment. Cicadas are actually
related to leafhoppers and spittlebugs, not grasshoppers. They do feed
on new growth of younger trees and shrubs; however, the damage is minimal
and not harmful to the plant, and will not have a long term effect. Because
they do not have a negative impact, there are no control measures recommended
for the cicada.
For the last 17 years the cicada nymph lives in the ground feeding on
tree roots. They have been there for some time, so obviously they don't
hurt the trees. When the periodic cicada emerges, it leaves the ground
and climbs a tree or fence post or any other vertical object. They shed
their skin, their wings emerge and they will fly. Their sole goal is to
find a mate, mate and then lay their eggs before they die. The male SINGS
to attract a companion and then mates with her.
Females lay the eggs in the bark of the trees. The only minor damage
that occurs to trees is when the females make a small slit in young stems
with their ovipositor and insert their eggs. All adult males and females
will die this season. The nymphs will fall onto the ground; burrow and
the 17-year cycle will begin all over again.
Our recommendation; enjoy the phenomena that only occurs every 17 years.
Who knows, you may even find their evening songs enjoyable. Remember,
you'll have to wait until 2024 to enjoy this again in our area. |