It's an emergence that hasn't been seen in centuries, but the length of time depends largely on the life cycle of the cicadas
"The periodical cicadas will start emerging when the soil temperature eight inches below the ground gets to 64 degrees," Jennifer Rydzewski, an ecologist with the Forest Preserve District of DuPage County, Meanwhile, several reports of cicadas sprouting from the ground have surfaced in recent days, and photos on social media showed trees covered in cicadas in parts of Illinois., but much of the region has yet to see the swarms of cicadas being warned about and the defeaning sounds that have sparked 911 calls in some states.
The ideal soil temperature for cicadas is 64 degrees, but a rise in humidity levels can also play a role, the Insect Asylum reported.."Cicada juveniles, or nymphs, emerge after a rainstorm when the soil temperature at 8 inches in depth exceeds approximately 64°F."When cicada nymphs first come out from the ground, they climb up to a tree or another high place and shed their shells.
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