A container full of knapweed root boring weevils.

A container full of knapweed root boring weevils.
Photo By/Credit

USFWS

Date Shot/Created
07/26/2017
Media Usage Rights/License
Public Domain
Image
Knapweed root boring weevils, Cyphocleonus achates, are effective biological control agents because they weaken or kill existing knapweed plants.
Facility
Litchfield Wetland Management District
Ecosystem
Prairie
Subject tags
Biological control
Insects
Invasive species