Pest profile

Twig Pruner

Anelaphus villosus (also listed as Elaphidionoides villosus) · Coleoptera: Cerambycidae[3]

The twig pruner is a native longhorned beetle whose larva bores inside a twig and cuts it from within, so small branches of oak, hickory, maple and other trees fall to the ground with the larva inside.[1][2]

Twig pruner beetle, a slender tan longhorned beetle with long antennae, on a painted board
Twig pruner beetle, a slender tan longhorned beetle with long antennae, on a painted board. (c) Cecil Smith, some rights reserved (CC BY) — via iNaturalist, CC BY 4.0

How to identify it

  • Adults are slender, grayish-yellow to brown longhorned beetles about 1/2 to 3/4 inch long, with antennae longer than the body.[1][2]
  • Fallen branches have a smooth, concave cut end, often with a small oval hole packed with frass where the larva sits.[1][2]
  • Larvae are slender, legless roundheaded borers, white with a dark head, about 1 inch long when mature.[1][2]

Look-alikes

Look-alikeHow to tell them apart
Twig girdlerTwig girdlers chew a groove around the outside of a twig, so the cut end looks gnawed, as if by a beaver.[2]

Where it lives

NC State and Maryland Extension report it on shade and ornamental trees in their states.[1][2]

US map: public records from 37 states since 1990 (GBIF).

Biology and life cycle

Females lay eggs in twigs; larvae bore toward the trunk and chew concentric cuts through the wood but not the bark, until the branch breaks and falls.[1][2]

The larva finishes developing, pupates and overwinters inside the fallen twig.[1][2]

Damage and signs

  • Hosts include oak, hickory, maple, elm, hackberry, honeylocust, linden, sweetgum, walnut, persimmon and fruit trees.[1][2]
  • Stressed trees, including drought-stressed young trees, seem more attractive to the beetles.[1]

Health risk

None to people or pets.[1][2]

Control

Prevention

Look under trees in August and September for twigs with concave cut ends, and split them lengthwise to find larvae.[2]

Sanitation

Rake up and destroy fallen twigs in fall or winter, before adults emerge in spring.[1][2]

Pesticides

Where twig pruners have been active, NC State says a pyrethroid spray the following spring could be considered.[1]

Common questions

Why are small branches with clean cut ends falling from my oak?
A twig pruner larva inside likely cut the branch from within.[1][2]
How do I control twig pruners?
Rake up and destroy fallen twigs before spring, since the larvae overwinter inside them.[1][2]
Will twig pruners kill my tree?
The damage is to twigs and small branches; stressed trees are more attractive to the beetles.[1]

Sources

  1. NC State Extension, “Twig Pruner (PDIC Factsheet).” content.ces.ncsu.edu/twig-pruner (accessed 2026-10-15)
  2. University of Maryland Extension, “Twig Girdlers and Twig Pruners on Trees.” extension.umd.edu/resource/twig-girdlers-and-twig-pruners-trees (accessed 2026-10-15)
  3. iNaturalist, “Anelaphus villosus taxon page (order and family).” www.inaturalist.org/taxa/213608 (accessed 2026-10-06)

Updated 2026-10-15. Built from sourced records. Spot an error? Tell us.