Columbia, South Carolina – For the first time in 221 years, a rare natural event is set to unfold in South Carolina: a dual emergence of cicadas, where two distinct broods of these noisy insects will appear simultaneously. This remarkable phenomenon involves Brood XIII, which will emerge in parts of Illinois and Indiana, and Brood XIX, set to appear in several states including South Carolina. This unique convergence last occurred in 1803 and isn’t expected again for another 221 years.
Cicadas are categorized into two types: annual and periodical. Periodical cicadas are especially noteworthy because they spend 13 or 17 years underground as nymphs, feeding off roots, before emerging en masse. The event this year features Brood XIX, which follows a 13-year cycle, and Brood XIII, on a 17-year cycle.
While cicadas are generally known for their loud mating calls, they play a significant ecological role. The noise, produced only by males, is a mating behavior and has been likened to a natural symphony. Despite their overwhelming presence, cicadas are not pests. They provide ecological benefits and are not harmful to humans, although their egg-laying process can damage young trees. Experts recommend protecting young trees by wrapping branches with cheesecloth to prevent female cicadas from laying eggs on them.