WSU Extension


Brown marmorated stink bug
Clover mites
Cluster flies
Fruit flies
Fungus gnats
Giant house spider
Hobo spider
House centipede
House dust mites
House flies
Little house flies
Mice and rats
Moth flies (drain flies)
Multi-colored Asian lady beetle
Odorous house ants
Pavement ants
Root weevils
Seed bugs
Sowbugs and pillbugs
Spiders (non-biting)
Thatching ants
Western boxelder bug

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Caption: adult black vine weevil
Photo by: K. Grey
Root weevils
(revision date: 2/27/2014)

Use Integrated Pest Management (IPM) for successful pest management.

Several species of weevils commonly enter homes either singly or in small groups, usually during late summer and into the fall. These beetles are collectively called “root weevils.” Outdoors, root weevils typically feed on plants including ornamentals such as rhododendrons, where they cause a distinctive notching on leaf margins. They can become a nuisance when they enter a home in large numbers. These weevils do not cause damage to the home, its contents or inhabitants, but may occasionally attack some houseplants. Species commonly found in homes in the Pacific Northwest are typically brown to black in color and range in size from around 1/4 inch to just under 1/3 inch. Many species of weevils are characterized by a domed back and a “snout” on the front of the head. Most are unable to fly. Root weevil infestations are temporary and harmless.
Management Options

Non-Chemical Management
  • For small numbers, vacuum or sweep up and remove insects.
  • Make sure vents, windows, and doors are adequately screened. Repair or replace damaged screens and door sweeps to prevent access to wandering insects. Seal openings around baseboards, windows, doors, pipes, and wires entering the home.
  • Remove sources of water and reduce irrigation near the house, as these can be attractive to insects.
  • Do not plant shrubs, flowers, etc., near or against the foundation of the home to avoid attracting weevils and other pests.
Select non-chemical management options as your first choice!

Chemical Management

Use of pesticides to control root weevils inside the home is not recommended.


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Caption: adult black vine weevil
Photo by: K. Grey