Cypress Buprestid

The Cypress Buprestid (Trachykele leconti) is a wood-boring beetle belonging to the Buprestidae family, order Coleoptera. Adults are typically 10-15 mm long with a vibrant metallic green or copper iridescence.

The insect possesses a sleek, elongated body shape, which allows it to navigate within the narrow galleries excavated under the bark of its host plants.

Larvae are legless, white, and feature an enlarged thoracic segment, which is a diagnostic characteristic for many buprestid species at the larval stage.

The life cycle of this pest is prolonged, often spanning multiple years, which means infestations can remain hidden for a significant period before symptoms become visible.

Adult beetles are typically active during the warm summer months, focusing on mating and finding suitable host trees to deposit their eggs.

This pest specifically targets members of the Cupressaceae family. Key hosts include cypress, arborvitae (thuja), juniper, and cedar trees in various landscapes.

The larvae are responsible for the actual damage, as they feed on the cambium layer and the sapwood, creating complex, winding tunnels that disrupt nutrient transport.

As the larval tunnels girdle branches or the main trunk, the affected parts of the tree fail to receive water and nutrients, leading to progressive dieback.

While the beetle often colonizes stressed or drought-stricken trees, dense populations can easily spread to perfectly healthy specimens in close proximity.

Long-term infestation significantly weakens the tree structure, making it susceptible to secondary pests and various opportunistic pathogens.

One of the most reliable signs of infestation is the presence of D-shaped exit holes on the bark, which are created by adults emerging after pupation.

Frass (a mixture of sawdust and excrement) often accumulates near the base of the tree or in bark crevices, indicating active feeding tunnels underneath.

Dying or yellowing branches within a healthy-looking crown are strong indicators that the vascular system has been compromised by larval galleries.

Heavy resin flow (pitching) is frequently observed on the trunk or branches as the tree attempts to seal off the wounds created by the tunneling larvae.

Reduced vigor, premature needle drop, and an overall thinning of the foliage are common visual cues that suggest a severe infestation is underway.

Cultural management is the first line of defense; keep trees healthy through proper irrigation and soil care to prevent them from becoming attractive to beetles.

Sanitation is critical; prune out and destroy infested branches or remove severely compromised trees to prevent the pest from spreading to neighboring plants.

Systemic insecticides applied to the soil or as a trunk injection can be effective, as they are translocated into the tree tissues to kill feeding larvae.

Foliar sprays applied during the adult flight period can reduce the population by killing beetles before they lay eggs on the bark surfaces.

Integrated Pest Management (IPM) programs should monitor local flight activity to ensure that chemical interventions are timed for maximum efficacy.