Cicada brood emerging in Northwest Georgia

They don’t sting, and they don’t bite. They don’t suck blood. They won’t make you itch. And your garden is safe.

But miniature exoskeletons might be attached to your house. You might see flickers of red-and-black buzz by. Over the weekend, you might’ve heard a monotonous droning begin.

They are cicadas, part of the Great Southern Brood XIX that re-emerges every 13 years.

Some maps showing their arrival only in north Georgia but the cicadas are emerging in central Georgia as well.

Temperatures are at the critical point said Georgia College & State University expert Bruce Snyder, an associate professor of biological and environmental sciences.

Cicadas stay beneath the ground as wingless nymphs, but they aren’t hibernating. They feed off sap in tree roots and tunnel about. When the year is right, they start burrowing up, waiting inside a hole near the surface of the ground for just the right temperature, a process Snyder called “staging.” When soil 8 inches deep reaches 64 degrees, they come out.

They’ll be around for about a month.

The Great Southern Brood is thought to be the largest geographically of all periodical cicadas — seen in Maryland along the coast to Georgia and in parts of the Midwest. For the first time since Thomas Jefferson was the U.S. President in 1803, the arrival of the 13-year Southern Brood coincides with the appearance of the 17-year Northern Illinois Brood XIII.

This happens only every 221 years.

“It’s a pretty rare opportunity,” Snyder said. “To have one happen where you’re living is a good opportunity to learn. It’s something people shouldn’t miss.”

A few “stragglers” come early, Snyder said, but most crawl out around the same time. They shed their exoskeletons and noisily look for mates. They don’t eat much. They just group together in trees in a loud chorus for one big reproductive party.

They’re clumsy flyers, Snyder said. So a couple are bound to smack into you. Or your windshield. You may crunch them underfoot. And your ears may ring from continuous buzzing.

Don’t confuse them with cicadas that show up every year in mid-summer. Those are brownish green and bigger, about 2 to 3 inches long. And they appear in fewer numbers.

Periodical cicadas are only about 1½ inches long. They come out less frequently, in the spring, but in the tens of millions. Between the Southern and Northern broods this year, a trillion are expected.

But they’re only here a short time. They’ll mate, lay eggs and disappear.

For another 13 years.

Emergence of the Great Southern Brood of cicadas has begun in Georgia and they’ll be around for about

a month.