Pestipedia

Flatheaded Borers

Overview

Flatheaded Borers are a group of wood-boring beetle larvae in the family Buprestidae, also known as metallic wood-boring beetles. These pests attack a wide range of trees and shrubs, particularly those that are stressed or newly planted. Their feeding can weaken or kill trees by disrupting internal nutrient flow.

Flatheaded borer” /></p> <p>Flatheaded borers are a diverse group of beetles in the family Buprestidae, known for the destructive tunneling behavior of their larvae. While the adult beetles are often called “metallic wood borers” due to their shimmering, iridescent wing covers, the larval stage is responsible for significant structural damage to both ornamental and forest trees. These larvae are easily identified by a distinctively widened, flattened segment just behind the head, which gives them their name. They primarily target trees stressed by drought, sunscald, or recent transplanting, making them a common headache for landscapers and orchardists.</p> <p>The damage caused by flatheaded borers is often hidden until it is too late. The larvae chew “serpentine” or winding galleries just beneath the bark, destroying the cambium layer that transports water and nutrients. Unlike “roundheaded” borers that tunnel deep into the heartwood, flatheaded varieties stay in the shallow tissue, effectively girdling branches or the entire trunk. This leads to canopy dieback, cracked bark, and “weeping” sap at entry points. Prevention is the most effective management tool; maintaining tree vigor through deep watering and avoiding mechanical “trunk wounds” from lawnmowers can prevent the adult beetles from selecting the tree as a host. For high-value trees already infested, systemic insecticides can sometimes halt the larvae before the damage becomes terminal.</p> <h2>Identification</h2> <ul> <li>Larvae have flattened, widened head region</li> <li>Adult beetles are often metallic or iridescent</li> <li>S-shaped galleries beneath bark</li> <li>Exit holes are D-shaped</li> </ul> <h2>Habitat</h2> <p> Flatheaded borers are found in forests, orchards, nurseries, and urban landscapes. They are especially common in areas with drought-stressed or damaged trees. </p> <h2>Behavior and Damage</h2> <p> Larvae feed beneath bark, creating tunnels that disrupt water and nutrient transport. This can lead to branch dieback, reduced growth, and eventual tree death. </p> <h2>Prevention and Control</h2> <p> Keeping trees healthy is the best defense. Avoiding stress, providing adequate water, and protecting bark from injury can reduce susceptibility. Infested wood should be removed promptly. </p> <h3>Related Pestipedia Articles</h3> <ul> <li><a href=Flatheaded Apple Tree Borer

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