How to Make and Set Up Flatheaded Borer Traps in Walnuts
By Jhalendra Rijal, Samaneh Sakaki, Daniel Green, Chang Vue
As Pacific flatheaded borer (PFB) populations rise in California walnut orchards, early detection is critical. This video demonstrates the assembly and installation of the most effective trap design identified in 2024-2025 studies: the Yellow or Red Triangular Trap.
What You Will Learn:
How to assemble a 4-foot triangular trunk-mimicking trap from corrugated plastic.
Precise placement strategies to maximize beetle capture.
Step-by-Step: How to prepare a yellow triangular trap and install it in the orchard:
Fold a 4-foot-tall corrugated plastic panel into a triangle (approx. 4 inches per side).
Apply a layer of specialized insect trap glue (such as TAD Insect Trap glue) to the outer surface to retain beetles.
Secure the trap to a support stake in the ground.
Position traps in "hot spots" where damage has been previously observed.
Monitoring: Check traps weekly through August. Collect and maintain records.
For monitoring, maintain a spacing of five trees between traps within a row and a gap of three rows between replications.
Find this and other videos at the IPM Corner YouTube channel