About Cicadas

The cicadas (sih-kay-duhs) comprise a family in the insect order Homoptera. This iverse group also contains leafhoppers, treehoppers, spittlebugs, aphids, and scale insects. More than 2,000 species of cicadas exist worldwide; the most common in Massachusetts are the periodical cicada (Magicicada septemdecim) and annual or dog day cicada (Tibicen linnei).

Identification

The annual or dog day cicada emerges every one or two years. It’s approximately 2.25 inches long, medium brown, with a green venation, the vein structure in its wing. Though we hear them each summer, these cicadas are solitary insects; we seldom see them.

The periodical cicada emerges once every 17 years. This smaller (1 to 1.5 inch) cicada is distinguishable by its black body, its more slender form, red eyes, and reddish-orange tinge on the wings. They often cover lower vegetation and any other surface in swarms immediately after they hatch.

Probably because of their regular population explosions, periodical cicadas have been confused with certain large grasshoppers that occur in crop-devastating swarms. It is these and other grasshoppers—not cicadas—that are properly called "locusts."

Life Cycle

Female cicadas make 40 to 50 slits in the twigs of broad-leafed trees, as well as weed and grass stems, in which to insert up to 400 eggs. The first stage nymph, which resembles a large, pale ant with front legs enlarged and modified for digging, hatches in six to seven weeks.

It then drops to the ground and buries itself two inches to two feet into the earth. This nymph lives by sucking juices from roots and grows gradually through eight stages before reaching maturity. The periodical cicada lives more than half of its 17-year lifespan as a mature nymph underground, and it is believed that dog day cicadas spend at least four years underground.

When the magic year arrives, the nymph digs to the surface, normally during the night, crawls up a tree trunk, and anchors itself with its claws. The skin of the back then splits, and the winged adult emerges and seeks its preferred habitat.

Singing

Cicadas are sometimes referred to as "harvester flies" because their "song" is characteristic of late summer days.This astonishingly loud sound comes from a pair of organs called "tympana" located at the base of the males' abdomen.

The tympana are complex mechanisms that consist of a series of three membranes inside a resonating chamber. A powerful muscle flexes one of these membranes (the tymbal), somewhat in the way we pull and release a metal, can top to create a loud click. Done in rapid succession and amplified by the resonating chamber, the familiar whine is produced. We can identify different species of cicadas by the distinctive tone of their hum.

Predators

Cicadas have many natural enemies, including birds, mites, fungal disease, and the cicada killer. This big black and yellow parasitic wasp catches and paralyzes its prey, then drags the victim into a subterranean burrow and uses it for an egg repository and as food for the larva.

Situations & Solutions

Probably because of their regular population explosions, periodical cicadas have been confused with certain large grasshoppers that occur in crop-devastating swarms. It is these and other grasshoppers—not cicadas—that we properly call “locusts.” Learn More

Broods

Though some species are called annual cicadas because they present every year, all species take at least four years to mature in the ground. Among periodical cicadas, numerous different "broods" occur. Learn More