Crickets

Certain crickets occasionally invade homes and become a pest by their presence. Homeowners complain of their monotonous chirping, which can be annoying especially at night when trying to get some sleep. Indoors, some crickets can feed on a wide variety of fabrics, foods and paper products. Cotton, linen, wool, rayon, nylon, silk and furs are susceptible, along with soiled fabrics, sizing from wallpaper, glue from book bindings, fruit, vegetables, meat and even other crickets. An occasional cricket or two in the home usually presents no serious problem. However, large populations may congregate around lights at night, making places unattractive.

IDENTIFICATION

Crickets get their name from the high-pitched sound or “chirp” produced when the male rubs his front wings together to attract a female. Different kinds of crickets can be identified by listening to their song.

The “True Crickets” (House, Field, Ground, Tree) resemble long horned grasshoppers in having long tapering antennae, striculating (singing) organs on the front wings of the male and auditory organs on the 4th leg segment.

HOUSE CRICKET

Adults are about 1.9 to 22-mm long, light yellowish-brown, with three dark bands on the head and have long, slender antennae much longer than the body. Wings lay flat on the back but are bent down abruptly on the sides. Females have a long, slender, tube like structure projecting from their abdomen for egg-laying. Both males and females have two antenna-like attached to the sides at the end of the abdomen.

House Crickets normally live outdoors especially in garbage dumps, preferring warm weather, but will move indoors when it gets colder usually in late summer. Overwintering occurs outdoors in the egg stage. Also, these crickets can live indoors, completing their life cycle with eggs laid in cracks, crevices and other dark areas such as behind baseboards.

FIELD CRICKET

Adults range in size from 1.27 to 3-cm long depending on the species, are usually black-coloured (sometimes brown), have long, slender antennae and a typical stout body (more robust than the house cricket) with large “jumping” hind legs. The ovipositor may be up to 1.9-cm long. Females have three easily seen appendages coming out of the tip of the abdomen, whereas males have only two. Most chirp and may sing both day and night.

Field crickets overwinter as eggs or nymphs in moist, firm soil. Each female lay between 150 to 400 eggs which hatch in the spring. Nymphs resemble adults except are smaller and wingless, moult eight to nine times and reach adulthood in about 90 days. They are serious agricultural pests feeding on many crop plants. They become household pests in late summer and early fall when they move out of fields and into buildings. They can damage furniture, rugs and clothing and the “chirping” of adult males can be irritating. They are readily attracted to lights, can fly and are often found around dumpsters. Large swarms may invade well-lighted areas covering streets and the sides of buildings black with crickets. They feed on nylon, wood, plastic fabrics, thin rubber goods and leather. Outbreaks occur when rainfall follows a period of drought.

GROUND CRICKET

Adults resemble house and field crickets but are much smaller, usually less than 1.27-cm long, and brownish. Spines on the hind tibiae are long and movable. Their songs are often soft, high-pitched, pulsating trills or buzzes.

Ground crickets act like field crickets except are smaller, overwinter as eggs, are largely active at night and attracted to lights. They occur in pastures, lawns and wooded areas.

SNOWY TREE CRICKET

Adults are about 2 to 2.3-cm long, pale yellowish – green or whitish shaded pale green and have a single black spot on the front side of each of the first two antennal segments. Male wings are broad, paddle-like, and lay flat on the back at rest, whereas the female fore wing is narrow, and wrapped closely about the body. They chirp at a regular rate varying with the temperature. These are the crickets commonly heard in the background noises of TV and movies. Most deliver loud trills.

Snowy Tree Crickets occur in trees, shrubs, weeds and high grass and are excellent singers, chirping at a regular rate varying with the temperature. Eggs are laid in the bark or stems of fruit and ornamental plants, often seriously damaging the twigs during the process of egg laying. Eggs are laid in pin-size holes (usually in single rows), sometimes injuring brambles of bush fruits. Overwintering eggs hatch in the spring with nymphs maturing in late summer. Apple, peach, plum, prune, cherry and berries are food hosts.

CAMEL CRICKET

Adults, sometimes called cave or cellar crickets, are a little over 1.9-cm long, light tan to dark brown (darker bands on some segments), wingless, with head bent downward, back arched (humpbacked appearance), large hind legs and long antennae.

Camel Crickets are active at night in cool, damp, dark areas and occasionally invading damp basements or crawlspaces. They are not attracted to lights nor produce songs. Overwintering occurs as nymphs or adults in protected places. They may be found living in large numbers, causing alarm. Some textiles may be damaged. Some hide under hay bales, feeding on other insects seeking shelter there. Most are found in caves, hollow trees, under logs and stones and in other dark, moist places. They can live and reproduce indoors.

NORTHERN MOLE CRICKET

Adults are 1.27 to 3.17-cm long, brownish to blackish-brown, with bead like eyes. Their broad front legs are adapted for “digging” (they resemble front feet of a mole). They have rather short antennae, a large head and can fly.

Northern Mole Crickets spend most of their life burrowing in the soil, coming to the surface as the soil is wet or flooded with rain. They are not often pests, but sometimes enter basements or homes. They fly to lights during their spring mating period. Females lay eggs in the soil (35 eggs per cell). Eggs hatch in 10 to 40 days with adulthood reached by autumn. They feed on roots, tubers and underground stems of grasses, strawberries, vegetables, etc. They overwinter as adults in the soil.

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LIFE CYCLE & HABITS

Adults are very attracted to lights, and become active at night (hide during the day) to crawl, jump or fly sometimes in countless numbers up the sides of houses, entering openings of even second and third story windows and roof skylights. The continued, monotonous “chirp” is loud and distracting, resulting in lost sleep. They will feed on silk, woollens, nylon, rayon and wood. They can bite when handled carelessly. They are found in fields, pastures, lawns, roadsides and in woods.

There are many different kinds and sizes of field crickets, none of which can survive and reproduce in buildings. They are found outdoors in similar places as are house crickets, especially under stones or boards, entering cool, moist basements in hot summers.

CONTROL MEASURES

Crickets are usually active at night (nocturnal), prefer shelter in cracks and crevices and invade homes seeking moisture. An occasional cricket or two in the home usually presents no serious problem. They are seldom serious pests in the home.

PREVENTION

Sanitation is the most important means of eliminating nuisance crickets. Keep all areas in and around buildings free of moisture, dense vegetation and weeds (30-cm band next to foundation). Mow lawns, cut weeds, and clean up garbage collection areas. Remove harbourage sites such as piles of bricks, stones, rotting wood and other debris. Caulk and seal all cracks and crevices, especially near the ground level at basement windows and doorways.

Make sure that all windows and doors are tight-fitting with proper screening in place. Exclusion is an important factor as well as light discipline. Avoid bright mercury vapour lights in entryways and along structure perimeters since crickets will be attracted from far distances. Convert to sodium vapour yellow lights (less attractive to insects) instead of white, neon or mercury vapour lights.

Never store firewood next to the house foundation. Raise garbage cans off the ground if practical. Trash and dumpsters should be placed as far from the building as possible. Crickets are attracted to food in these areas. Crickets may be troublesome at trash dumps, grassy roadsides, pasture fields and wooded areas (breeding sites) before entering structures. Crickets can be killed with a fly swatter, collected by vacuum cleaner or broom and dustpan and discarded, if a few are present. Sometimes pet owners, who keep cricket-eating animals, accidentally allow crickets to escape. These individuals establish an indoor population.

ACKNOWLEDGEMENT

HYG-2083-97

William F. Lyon

 Keith L. Smith, Associate Vice President for Ag. Adm. and Director, OSU Extension.

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