Confirmation of species requires finding the insect, although knowing symptoms and host plant species can help narrow down the possibilities.Effective management practices vary by insect species.Monitor tree trunks and branches regularly to detect infestations before they become serious.Ĭorrect borer identification is essential.Avoid pruning trees when borer adults are flying, usually late winter through late summer.Protect tree trunks and branches from sunburn.Avoid mechanical injuries to trunks and roots.Irrigate trees properly and separately from regular lawn watering.Plant tree species adapted to your area.To avoid a borer attack, keep trees healthy: Insecticides can be used to prevent infestations of borers on high-value trees. Usually by the time a tree is infested with borers, there is little you can do to manage them other than to improve tree vigor, prune out infested branches, or remove the tree. However, some invasive insect borers attack healthy trees. Most borers can successfully attack only trees that have been stressed by improper irrigation or care, disease, or mechanical injury. Clearwing moth larvae bore large holes and leave sawdust-like frass.Ī number of different types of insects can bore into tree trunks and branches as adults or larvae, producing sawdust or sap-filled holes and weakening trees.
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