Cerambycids/Longhorned Beetles

Category: Miscellaneous

Scientific Name: Various Insecta/Coleoptera/Cerambycidae



Color: Body is brown to blackish, with larvae being whitish or cream colored

Size: Body of adults is 10 – 25 mm long

Region: Found throughout the US and Canada

Important Considerations:

  • The name “longhorned,” comes from the beetles’ antennae with are very long and usually exceed the length of the body

  • There are about 1,200 species that occur in the United States and Canada

  • Groups Longhorned Beetles usually infest sapwood, softwoods, and hardwoods

  • Females lay their eggs in bark or wood crevices during the spring, summer, or early fall, and larvae hatch in a few days

  • Larval stage of this beetle can last from months to years, depending on the nutrition they receive from the wood


Where to Find Them on Your Property?

You may find Cerambycids/Longhorned Beetles on unseasoned wood, including both logs and lumber. There are only 2 species that will reinfest seasoned wood, so it is likely they will only be found on unseasoned wood. Log homes can occasionally require fumigation, but this will depend also on the moisture conditions and maintenance procedures that have been done.