WSU Extension

Pestsense

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

(revision date: 2/27/2014)


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

Biology
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
IMPORTANT: Visit Home and Garden Fact Sheets for more information on using pesticides

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