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. |
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