The ambrosia beetles (such as Xyleborus) feed on fungal "gardens" cultivated on woody tissue within the tree. Some bark beetles form a symbiotic relationship with certain Ophiostomatales fungi, and are named " ambrosia beetles". A species of the extant mostly Neotropical genus Microborus is also known from the Cenomanian aged Burmese amber of Myanmar. The oldest known member of the group is Cylindrobrotus from the Early Cretaceous ( Barremian) aged Lebanese amber. When in large quantities, the sheer number of beetles can overwhelm the tree's defenses with resulting impacts on the lumber industry, water quality, fish and wildlife, and property values. Chemical compounds can also be induced by tree species that bind with amino acids in the gut of bark beetles, reducing their ability to process woody materials. Resins also trap insect pests making some initial entry by bark beetles unsuccessful.
Released sap or resins can plug bored holes of bark beetles and seal wounds. Sap is one of the first lines of defense of pines against bark beetles. In defense, healthier trees may produce sap, resin or latex, which often contains a number of insecticidal and fungicidal compounds that can kill, injure, or immobilize attacking insects. īark beetles often attack trees that are already weakened by disease, overcrowding, conspecific beetles, or physical damage. However, a few species are aggressive and can develop large populations that invade and kill healthy trees and are therefore known as pests. In undisturbed forests, bark beetles serve the purpose of hastening the recycling and decomposition of dead and dying wood and renewing the forest. Some breed in trees of only one species, while others in numerous species of tree. Most restrict their breeding area to one part of the tree: twig, branch, stem, or root collar. While some species, such as the mountain pine beetle ( Dendroctonus ponderosae), do attack living trees, many bark beetle species feed on weakened, dying, or dead spruce, fir, and hemlock. Mountain pine beetles killed these lodgepole pine trees in Prince George, British Columbia.īark beetles feed and breed between the bark and the wood of various tree species. The eyes are also flattened and hypothesized to help see in low-light conditions. The combination of their shape and appendages greatly helps in the excavation of woody tissue. The legs of most bark beetles are very short and can be retracted or folded into the body. Bark beetles also have small appendages, with antennae that can be folded into the body and large mandibles to aid in the excavation of woody tissue. īark beetles are distinct in their morphology due to their small size and cylindrical shape.
At the end of the larval stage, chambers are usually constructed for the pupae to overwinter until they are ready to emerge as an adult. Once the eggs hatch, the larvae then live in the tree, feeding on the living tissues below the bark, often leading to death of the tree if enough larvae are present. This usually occurs in mid to late summer.
While there is variation among species, generally adults first bore into a tree and lay their eggs in the phloem of the tree. A tiny bark beetle, the coffee berry borer, Hypothenemus hampei is a major pest on coffee plantations around the world.īark beetles go through four stages of life: egg, larvae, pupae, and adult, with the time to develop often relying on the species as well as the current temperature. A similarly aggressive species in Europe is the spruce ips Ips typographus. The mountain pine beetle Dendroctonus ponderosae, southern pine beetle Dendroctonus frontalis, and their near relatives are major pests of conifer forests in North America. scolytus, which like the American elm bark beetle Hylurgopinus rufipes, transmit Dutch elm disease fungi ( Ophiostoma). multistriatus and the large elm bark beetle S. Well-known species are members of the type genus Scolytus, namely the European elm bark beetle S. Although the term "bark beetle" refers to the fact that many species feed in the inner bark (phloem) layer of trees, the subfamily also has many species with other lifestyles, including some that bore into wood, feed in fruit and seeds, or tunnel into herbaceous plants. Previously, this was considered a distinct family ( Scolytidae), but is now understood to be a specialized clade of the "true weevil" family ( Curculionidae). A bark beetle is the common name for the subfamily of beetles Scolytinae.