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The periodical cicada, Magicicada septendecim, appeared today in Illinois.....Egg-laying injury occurs mostly on newly planted shade trees. Damage occurs when the female cicada cuts two parallel slits in small twigs where she lays 24 to 28 eggs. Sometimes, a continuous slit 2 to 3 inches long is formed as she slowly makes her way up a twig. The slits cause flagging, or breakage, to the tips of the branches. The eggs hatch in midsummer, and young cicadas, or nymphs, fall to the ground. They burrow into the ground and spend 16½ years feeding on small roots. At the end of this time, usually in May or early June, nymphs move to the surface and crawl up a tree trunk where they shed their skins.....Adults are red eyed and dark bodied. They do not feed and live only for a few weeks while reproduction takes place. Males are responsible for the noise when they call for mates. The most common call sounds like "f-a-r-r-o."....