The Palo Verde Beetle (Derobrachus geminatus) is dark brown to black with long segmented antennae and spiny thorax and typically measures 2.5–3 inches. The palo verde beetle (Derobrachus geminatus) is a large longhorn beetle (family Cerambycidae) closely related to Derobrachus hovorei and sharing nearly identical biology and habits. Like its relative.

Yes — the Palo Verde Beetle is considered a high-risk pest. Tree mortality from root system destruction. Sudden tree collapse poses safety hazard. Significant landscape damage in Arizona's urban and suburban areas.

In Arizona, palo verde beetles are most often encountered in the following situations: Large dark brown beetles (2.5–3 inches) at lights or on the ground in July–August. Tree decline, yellowing foliage, or sudden collapse of palo verde or mesquite. Large emergence holes in soil near tree base. Frass and wood shavings around tree base.

The Palo Verde Beetle is most active during: Adults emerge July–August; larvae active year-round in root systems. Arizona's warm desert climate can extend activity periods compared to other states, so year-round vigilance is recommended in the Phoenix metro and surrounding areas.

Keep trees healthy and well-irrigated during drought. Avoid root zone disturbance. No reliable preventive chemical treatment for established larvae.

No effective treatment for established root infestations. Remove dead or structurally compromised trees. Consult a certified arborist for high-value trees; soil-applied systemic insecticides may offer limited protection.

Left unchecked, Palo Verde Beetle infestations can cause significant structural or food-storage damage over time. Tree mortality from root system destruction. Sudden tree collapse poses safety hazard. Significant landscape damage in Arizona's urban and suburban areas. Early detection and professional treatment are the most cost-effective approach — contact Pest Control Bros for an inspection at the first sign of activity.