Treeborers are chewing insects, usually in larval stages, that chew and feed on the inner bark and/or wood of trees. Wood-boring insects are among the most destructive pests of ornamental trees and shrubs. Most borers are the larvae (immature stages) of certain moths and beetles. Wood-boring insects fall into two categories — primary and secondary invaders. Most treeborers act as secondary invaders, meaning they attack weakened, dying, or dead trees. There are many insects that can be described as borers. The insects that bore into the seasoned timbers of furniture and houses are different species to those that bore into trees. Treeborers and wood boring insects make their homes in the bark, trunks and branches of trees. Many different species of borers attack trees and shrubs. They may be beetles or caterpillars (clearwing borers).peach treeborerinsect. Peachtree borer (Synanthedon exitiosa). Borers, insects that develop underneath the bark of woody plants, attack many shade and ornamental trees. Treeborers are a group of insects that lay their eggs on or inside of trees, where the young larvae eat their way through living tissues. These miscreants can be either beetles or clearwing... Summer: Tree pest inspection and control for scale insects, treeborers, and aphids.Borers are defined as any wood boring insects including moths, beetles, sawflies, horn tails and flies. Wood-boring insects that attack healthy trees and shrubs are called “primary invaders.”Peach treeborer (Synanthedon exitiosa) is one of the most important insect pests of peach and plum. For these reasons, SavATree offers comprehensive insect management solutions that address treeborers and many other potential threats. Both emerald ash borer and Asian longhorned beetle can be found attacking stressed as well as healthy trees. Both of these boring insects are species that are not native to this country. Systemic insecticides are injected into the sap system of the tree. The insecticide then travels throughout the sapwood that the Borers are feeding on, killing the insects. After trees and shrubs are infested with borers, non-chemical controls are limited. Consider inserting a flexible, small gauge wire into borer entry holes to puncture and kill the tunneling insect.