long-horned beetle
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What is a long-horned beetle?
Long-horned beetles belong to the family Cerambycidae, encompassing roughly 25,000 species within the insect order Coleoptera. Their name comes from the extremely long antennae characteristic of most species. Though found worldwide, they are most abundant in the tropics and vary in size from 2 to 152 mm, with their antennae potentially doubling or tripling their total length.
The yellowish or white larvae, known as roundheaded borers, bore through woody plants, feeding for a year or more. This wood-boring habit can make long-horned beetles serious pests to trees. The long-horned beetle family is further divided into subfamilies such as prionids, cerambycids, lepturids, and lamiids.
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What do long-horned beetles look like?
Long-horned beetles belong to the family Cerambycidae and are known for their extremely long antennae. These beetles, of which there are roughly 25,000 species, are found all over the world, but are most common in tropical regions.
Their sizes range from 2 to 152 mm, and can double or triple when including the length of their antennae. Many long-horned beetles have coloration patterns of yellow, black, and orange, and some species mimic wasps or ants. For example, the Asian long-horned beetle is shiny black with irregular white spots and black-and-white ringed antennae.
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Where do long-horned beetles live?
Long-horned beetles (family Cerambycidae) are found worldwide, with the greatest number of species populating the tropics. While many species can be found in temperate environments, individual species are most abundant in these areas.
These beetles can thrive in nearly all climates and latitudes, except for extreme environments like Antarctica or the highest altitudes. They can be found on subantarctic islands, near the Arctic, and on mountaintops.
Some long-horned beetle species are solitary, while others live in groups.
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What do long-horned beetles eat?
Long-horned beetle larvae, also known as roundheaded borers, use their strong jaws to bore through woody plants, feeding there for one to two years or more. Because of these wood-boring habits, long-horned beetles can be serious pests to trees used for timber, pulpwood, landscaping, fruit production, and woody ornamentation.
Adults of many long-horned beetle species visit flowers, while others feed on tender new bark. For example, the elderberry longhorn feeds on the leaves and flowers of the elderberry bush, while its larvae bore into the stems.
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Why are their antennae so long?
Long-horned beetles, belonging to the family Cerambycidae, are named for their characteristically long antennae, which are typically longer than their body length. While the precise reasons for this adaptation aren't fully clear, the antennae function as sensory organs, providing the beetle with crucial information about its surroundings.
These beetles use their long antennae to detect touch, perceive their body position, and sense gravity. The long antennae may provide an increased surface area for receptors, improving their ability to detect potential mates, food sources, or suitable egg-laying sites.
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How do long-horned beetles affect forests and wooden structures?
Long-horned beetles (family Cerambycidae) can be destructive to forests and wooden structures due to their wood-boring larval stage. The yellowish or white larvae, also known as roundheaded borers, use their strong jaws to bore through woody plants, feeding for one to two years or more. This wood-boring habit can cause serious damage to timber and pulpwood trees, landscape trees, fruit trees, and woody ornamental plants.
The Asian long-horned beetle (Anoplophora glabripennis), for example, is a major pest of hardwood trees, especially maple, willow, and elm species. Larval tunneling disrupts vascular flow, and repeated infestations can weaken trees, causing limbs or trunks to break.
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long-horned beetle, (family Cerambycidae), any of about 36,000 species of beetles (insect order Coleoptera) whose common name is derived from the extremely long antennae of most species. These beetles occur throughout the world but are most numerous in the tropics. Because of their wood-boring habits, some long-horned beetles can be serious pests of timber and pulpwood trees, landscape trees, fruit trees, and woody ornamental plants.
Physical description and natural history
Adult long-horned beetles range in size from 2 to 152 mm (less than 1/8 to about 6 inches). However, these lengths may double or triple when the antennae are included. Many adults (e.g., Clytus arietes of Europe) visit flowers and have yellow, black, and orange coloration patterns that mimic wasps. Some tropical species of Clytus mimic ants. The African Pterognatha gigas resembles a patch of moss or lichen with a few strands, its antennae, sticking out.
The yellowish or white larvae are often known as roundheaded borers, because the front part of the plump larva is expanded to give it a rounded appearance. Using its strong jaws, the larva bores through and feeds in woody plants for one to two years or more. When ready to pupate, the larva bores a tunnel to the outside, pupates within the tree, and, as a new adult, uses this tunnel as its exit.
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Major subfamilies, genera, and species
The long-horned beetle family is divided into several subfamilies, including the following:
The prionids (subfamily Prioninae) have leathery, brownish wing covers (elytra), and the margins of the prothorax (region behind the head) are toothlike and expanded laterally. Included in this group is the pine-inhabiting genus Parandra and the broad-necked prionus (Prionus laticollis), whose larvae live in grape, apple, poplar, blueberry, and other fruit and ornamental tree roots.
The cerambycids (subfamily Cerambycinae) include the ribbed pine borer (Rhagium inquisitor), which has a narrow thorax with a spine on each side and three lengthwise ridges on its wing covers. It lives in pine trees during the larval stage. Another cerambycid is the locust borer (Megacyllene robiniae), which is black with yellow stripes across the body. Female locust borers lay their eggs in black locust trees. After the larvae hatch, they bore into the inner bark of the tree, creating tunnels and leaving the tree susceptible to damaging infection by a species of fungus known as Fomes rimosus (Phellinus rimosus).
The lepturids (subfamily Lepturinae) include the elderberry longhorn (Desmocerus palliatus), also called the cloaked knotty-horn beetle because it looks as if it has a yellow cloak on its shoulders and has knotted antennae. It feeds on leaves and flowers of the elderberry bush, and its larvae bore into the pithy stems.
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The lamiids (subfamily Lamiinae) include the sawyer (Monochamus), a gray-brown beetle about 30 mm (1.2 inches) long, not including the long antennae. The larvae live in pines and firs and bore tunnels up to 10 mm (0.3 inch) in diameter. The roundheaded apple tree borer (Saperda candida) can be a major apple pest. The twig girdler (Oncideres cingulata) deposits eggs in twigs and then girdles, or cuts, a groove around the twig. Eventually the twig dies and breaks off, and the larvae develop inside the dead twig. The harlequin beetle (Acrocinus longimanus) is a large tropical American beetle with an elaborate variegated pattern of black with muted red and greenish yellow markings on its wing covers.
The Asian longhorned beetle (Anoplophora glabripennis), native to China and Korea, is a major pest of many hardwood trees, especially species of maple, box elder, horse chestnut, buckeye, willow, and elm. Adults are shiny black in color with irregular white spots and are large, ranging from 1.9 to 3.8 cm (0.75 to 1.5 inches) in body length. They have black antennae with white rings that are between 3.8 to 10.2 cm (1.5 to 4 inches) long. During the summer months, adult females chew through the bark and deposit an egg, causing a visibly dark wound in the tree that is about 1.3 cm (0.5 inch) in diameter. After the larvae hatch, they migrate to the heart of the tree, where they feed and mature and then burrow to the exterior, leaving a hole about 9.5 mm (0.375 inch) wide. The Asian long-horned beetle is thought to have been transported to North America in wood pallets, resulting in infestations in New York in 1996 and several years later in New Jersey, Chicago, Illinois, and Toronto, Ontario. Measures such as removal and destruction of trees, quarantine of infested areas, strict regulations on the transport of wood, and insecticide treatments restrict the Asian long-horned beetle to isolated areas.