How to Manage Pests

Pests in Gardens and Landscapes

Seasonal development and life cycle—Shothole borer

Female shothole borers bore small holes, which look like shot holes, in the bark and lay eggs in a gallery 1 to 2 inches long running lengthwise down the cambium layer of the tree. Hatching larvae feed and excavate secondary galleries at right angles to the egg gallery, creating a gallery system that looks like a centipede. Larvae spend the winter in their galleries beneath the bark. Two or three generations occur a year in California.

Small holes in bark caused by females
Small holes in bark caused by females

Shothole borer adult
Shothole borer adult

Egg in a gallery
Egg in a gallery

Statewide IPM Program, Agriculture and Natural Resources, University of California
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