John Hamrick, the extension agent in Washington County, Tenn., said cicadas emerge from the ground every 13 or 17 years, although a brood, or large group of them, could hatch in any given year.
“According to the maps and schedules, we should be having an emergence this year,” Hamrick said.
In fact, a large group of cicadas could show up any day now, he said.
The insects don’t eat anything, but the females can cause significant damage to different kinds of trees during their brief, adult lives. The most noticeable thing about these bugs is the noise they generate.
“It sounds like the aliens are coming. It can be pretty deafening at times,” Hamrick said.
Once here, Hamrick said cicadas only live about a month. (LINK)
The echoes in the mountains are deafening.