11/06/2025
PECAN WEEVIL GRUB EXIT HOLES
Pecan weevil activity starts in early August. Adults emerge from the soil. To deposit eggs in pecans, a female feeds through the shuck and shell to the kernel. She then excavates a small cavity into the developing kernel. She turns around and uses her ovipositor to place three to four eggs (per nut) on the developing kernel.
Larvae hatch and feed in the kernel. When fully developed, larvae chew a single hole (occasionally two) through the shuck and shell, exit the nut, and drop to the ground. The time from egg lay to larval emergence is approximately 42 days.
~ Bill Ree, Allen Knutson and Marvin Harris,
Controlling The Pecan Weevil, Texas A&M AgriLife Extension Service.