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Home / Tips and Tricks / Brood X crickets are starting to appear on the map: what you need to know now

Brood X crickets are starting to appear on the map: what you need to know now


Periodic crickets emerge from the ground in the spring of their 13th or 17th year. Here, a periodic cicada nymph clings to a tree branch in Greenbelt, Maryland on May 11.

Jim Watson / AFP via Getty Images

Brood X’s highly anticipated crickets have begun tunneling from their underground homes for the first time in 17 years in parts of the eastern US, with trillions of people expected to show off their black bodies and bold red eyes in the coming weeks. Here’s everything you need to know this remarkable natural sight.

What is Brood X?

Periodic crickets, as they are known, are different from annual crickets. They spend almost their entire life a few meters underground and live on sap from tree roots. Then, in the spring of their 13th or 17th year, depending on the type, adult cicada nymphs emerge for a short adult stage, synchronously and in great numbers for a massive mating frenzy.

A newly emerged periodic cicada sheds its exoskeleton and unfolds its wings. Soon it will be mating season.

GIF by Leslie Katz / CNET

Groups of crickets that share the same emergence years are known as broods. This spring, insects belonging to one of the largest broods of 17-year-old crickets, called Brood X or the Great Eastern Brood, are crawling out of their subterranean hiding places.

The insects climb up the nearest vertical surface. They shed their exoskeletons and blow their wings. After resting for a few days and waiting for their shells to harden, mating begins. The burst of activity is impossible to miss as hordes of males begin broadcasting their high-pitched mating song. This is done through sound-producing structures called tymbals on either side of their abdomen.

“They can gather … in parks, forests, neighborhoods, and can seemingly be anywhere,” explained Michigan State University entomologist Gary Parsons in an MSU question and answer session on the phenomenon. “When they are so numerous, they fly, land and crawl everywhere, also occasionally landing on people.” Do not you worry. They can’t hurt you.

Where and when will Brood X come out?

Parts of 15 states, as well as Washington, DC, will hear the romantic serenades of males in trees trying to attract females. The states are Delaware, Georgia, Illinois, Indiana, Kentucky, Maryland, Michigan, North Carolina, New Jersey, New York, Ohio, Pennsylvania, Tennessee, Virginia, and West Virginia.

cicada card

Forest Service of the United States

The return of the crickets usually starts around early to mid-May and continues until the end of June. The bugs usually start to come out when soil temperatures 20 inches below the ground reach 64 degrees Fahrenheit (18 degrees Celsius), with a warm rain often triggering their emergence. Cooler weather than usual in parts of the US this year is slowing their appearance in some places.

However, sightings of adult crickets have been reported in some states, including Georgia, Kentucky, Maryland, North Carolina, Pennsylvania, Tennessee, and Virginia. The bugs have also surfaced in the Washington, DC area. Residents of those areas are busy sharing the evidence on social media.

How do crickets sound?

It varies by species, but it can sound like a high-pitched electric hum, a chirp, or a rattle (hear it below). The call of a group of men can be more than 90 decibels, about the same level as a motorcycle about 8 meters away. The females respond to the males’ calls by clicking their wings, and all the back and forth movement creates a distinctive symphony.

Listen to the 17 year old crickets

Can crickets hurt people? How about trees?

No, the insects are harmless. They do not sting, bite or carry disease, and they usually do not enter, although they do collect on outside walls.

Exoskeletons left behind by the newly emerged Brood X crickets in 2021 adorn a tree in Annapolis, Maryland.

Russell Holly / CNET

“The only way they could get in is accidentally fly in through an open door or window, or because they landed on a person who then carried them in unnoticed,” said Parsons.

During dense emergence, females can lay enough eggs in branches to damage young trees, but abundant egg laying also naturally prunes trees, resulting in more flowers and fruit in the years that follow. Crickets also have other ecological benefits. Periodic crickets aerate large amounts of soil when they emerge en masse, and when they die, their decaying bodies enrich the soil with nutrients.

Here is what to do to prepare your lawn and trees.

Can pest control agents help me?

When people ask for help during the crop of cicadas, those in pest control are largely in a position to educate customers on why the pest control workers don’t show up and spray their garden with pesticides.

“We really want people to understand and know that pesticides are not the answer, which sounds really funny if you come from a pest control company,” said Frank Meek of pest control company Orkin. tells my CNET colleague Erin Carson. “Pesticides are not the thing to use for this insect. They don’t work for it, and it’s a waste of product, and it’s a hazard to the environment to spray on just because you’re afraid of the crickets.” ”

Why do so many crickets appear at once?

It is thought that by showing up in such large numbers, enough of them can evade predators and live on to mate – in fact, force in numbers.

What can scientists learn from cricket mapping?

cicada safari

With the Cicada Safari app, citizen scientists can help map the insects.

Cicada Safari

Some people consider the mass of insects to be one annoying annoyance, but others welcome it as an awe-inspiring natural wonder. Some in the latter category even regularly travel across the US to areas where cicadas pop up to experience the sights and sounds and help scientists map the creatures.

Cicada mapping helps scientists verify the periodic life cycles of insects, as well as their relationships with each other, to gain a better understanding of biodiversity, biogeography and ecology.

A free app created at Mount St. Joseph University in Cincinnati called Cicada Safari and available for iOS and Android allows citizen scientists to record periodic cicada sightings. They can also record sightings on the Cicada Mania and iNaturalist websites, a joint initiative of the California Academy of Sciences and the National Geographic Society.

Because periodic crickets are sensitive to climate, patterns of different broods and types reflect climate change, note John Cooley and Chris Simon, professors of ecology and evolutionary biology at the University of Connecticut.

“Genetic and other data from our work, for example, indicate that the 13-year-old species Magicicada neotredecim, found in the upper Mississippi Valley, formed shortly after the last Ice Age,” they write in a piece for The Conversation. “As the environment warmed, 17-year-old crickets consecutively emerged in the area, generation after generation, after 13 years underground, until they were permanently shifted into a 13-year cycle.”

Because Brood X occurs four years after Brood VI and four years before Brood XIV, and because the three broods are adjacent in parts of their geographic range, cicada trackers may see “laggards” of other broods this year.

“From a biological perspective, four-year laggards of each of these broods are interesting because they can cause gene flow between them,” explains the University of Connecticut. “From a practical standpoint, the four-year laggards of all these broods complicate mapping efforts because it can be difficult to assign populations to a brood.”

Laggards may confuse map efforts, but the university insists that a “misleading map is worse than no map at all.”

How long will Brood X last?

Mass mating takes at least three to four weeks. Shortly after, the newly hatched nymphs will crawl to the edge of the tree branches where the females laid their eggs, fall to the ground, and burrow for the next 17 years. And so the cycle begins again. Godspeed, Brood X.

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