Pest Library: Beetles
Beetles are a group of insects that form the order Coleoptera, in the superorder Endopterygota. Their front pair of wings is hardened into wing-cases, elytra, distinguishing them from most other insects. The Coleoptera, with about 400,000 species, is the largest of all orders, constituting almost 40% of described insects and 25% of all known animal life-forms; new species are discovered frequently. The largest of all families, the Curculionidae (weevils) with some 70,000 member species, belongs to this order. They are found in almost every habitat except the sea and the polar regions. They interact with their ecosystems in several ways: beetles often feed on plants and fungi, break down animal and plant debris, and eat other invertebrates. Some species are serious agricultural pests, such as the Colorado potato beetle, while others such as Coccinellidae (ladybirds or ladybugs) eat aphids, scale insects, thrips, and other plant-sucking insects that damage crops.
Beetles typically have a particularly hard exoskeleton including the elytra, though some such as the rove beetles have very short elytra while blister beetles have softer elytra. The general anatomy of a beetle is quite uniform and typical of insects, although there are several examples of novelty, such as adaptations in water beetles which trap air bubbles under the elytra for use while diving. Beetles are endopterygotes, which means that they undergo complete metamorphosis, with a series of conspicuous and relatively abrupt changes in body structure between hatching and becoming adult after a relatively immobile pupal stage. Some, such as stag beetles, have a marked sexual dimorphism, the males possessing enormously enlarged mandibles which they use to fight other males. Many beetles are aposematic, with bright colours and patterns warning of their toxicity, while others are harmless Batesian mimics of such insects. Many beetles, including those that live in sandy places, have effective camouflage.
About 75% of beetle species are phytophagous in both the larval and adult stages. Many feed on economically important plants and stored plant products, including trees, cereals, tobacco, and dried fruits. Some, such as the boll weevil, which feeds on cotton buds and flowers, can cause extremely serious damage to agriculture. It remains the most destructive cotton pest in North America. Mississippi State University has estimated, since the boll weevil entered the United States, it has cost cotton producers about $13 billion, and in recent times about $300 million per year.
The bark beetle, elm leaf beetle and the Asian longhorned beetle (Anoplophora glabripennis) are among the species that attack elm trees. Bark beetles (Scolytidae) carry Dutch elm disease as they move from infected breeding sites to healthy trees. The disease has devastated elm trees across North America.
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Ants: Acrobat Ant, Allegheny Mound Ant, Argentine Ant, Big-headed Ant, Carpenter Ant, Citronella Ant, Crazy Ant, Field Ant, Fire Ant, Ghost Ant, Harvester Ant, Little Black Ant, Moisture Ant, Odorous House Ant, Pavement Ant, Pharaoh Ant, Texas Leaf Cutter Ant, Thief Ant, Velvety Tree Ant and White-footed Ant.
Cockroaches: American Cockroach, Asian Cockroach, Australian Cockroach, Brown Banded Cockroach, Cuban Cockroach, Florida Woods Cockroach, German Cockroach, Oriental Cockroach, Smoky Brown Cockroach, Surinam Cockroach and Woods Cockroach.
Spiders: Black Widow Spider , Brown Recluse Spider, Cellar Spider, Crab Spider, Domestic House Spider, Funnelweb Spider, Garden Spider, Ground Spider, Hobo Spider, House Spider, Jumping Spider, Spiny-backed Orb Weaver Spider, Tarantula, Wolf Spider and Yellow Sac Spider.
Stinging Pests: Africanized Honeybee, American Dog Tick, Bald-faced Hornet, Bed Bugs, Bird Lice, Bird Mite, Deer Tick, Brown Dog Tick, Bumblebee, Carpenter Bee, Cat Flea, European Hornet, Fire Ant, Honeybee, Human Head Lice, Kissing Bug, Lone Star Tick, Paper Wasp, Scorpion, Soft Tick, Thrips and Yellow Jacket.
Ticks and Mites: American Dog Tick, Bird Mite, Black-legged Tick, Brown Dog Tick, Clover Mite, Lone Star Tick and Soft Tick.
Other Pests: American Spider Beetle, Bean Weevil, Cigarette Beetle, Cowpea Weevil, Dried Fruit Beetle, Drugstore Beetle, Foreign Grain Beetles, Indian Meal Moth, Larder Beetle, Mediterranean Flour Moth, Red or Confused Flour Beetle, Rice & Granary Weevils, Sawtoothed & Merchant, Grain Beetles, Shiny Spider Beetle, Cabinet Beetles, Centipedes & Millipedes, Chinch Bugs and Earwigs.